Device for pairing electronic devices and USB keys
Patent Information
- Application Number
- FR2023013447
- Authority / Receiving Office
- FR · FR
- Patent Type
- Patents
- Current Assignee / Owner
- Filing Date
- 2023-12-01
- Publication Date
- 2026-09-11
- Estimated Expiration
- 2043-12-01
AI Technical Summary
Existing methods for connecting USB keys to electronic devices lack a reliable mechanism to prevent accidental or incorrect connections, which can compromise information systems by allowing unauthorized data exchange.
A device comprising tubular parts with geometric coding patterns that ensure a specific USB key can only be connected to a designated electronic device, preventing interchangeability and ensuring correct connections.
The solution effectively prevents incorrect USB key connections to electronic devices, minimizing the risk of data compromise and ensuring secure information exchange.
Smart Images
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Abstract
Description
Title of the invention: Device for connecting electronic devices and USB keys Technical field
[0001] The invention relates to the field of coupling parts adapted to simultaneous cooperation with several complementary parts, in particular for the distribution of energy and for the exchange of digital data. State of the prior art
[0002] It is known to use USB flash drives to transfer digital data from or to a computer. They are generally and mainly composed of a male USB connector and a key body containing a controller, a flash memory and a quartz oscillator.
[0003] In order to avoid any compromise of information, it is customary to physically partition information systems. Thus, some users, companies or administrations have several independent information systems, characterized according to the type of information processed and their level of protection.
[0004] These information systems must not exchange information between them, at the risk of compromising them. However, to transfer data in these information systems, it is sometimes necessary to connect peripherals such as, for example, USB keys.
[0005] It is therefore important to prevent the involuntary connection of such peripherals with a USB port to information systems which are not dedicated to them.
[0006] To discriminate between keys dedicated to an electronic device and those which are not, it is known to use distinctive signs such as a color code, inscriptions or symbols.
[0007] However, these distinctive signs may not be enough to avoid an error, as a newcomer may not know their meaning, or simply due to inattention.
[0008] The aim of the invention is to propose a device enabling a non-malicious person to seamlessly associate at least a first USB key with a first dedicated device and a second USB key with a second dedicated device in a non-interchangeable manner, even in the case where, originally, all the keys are physically and visually identical. Statement of the invention
[0009] The aim of the invention is to resolve the aforementioned drawbacks by avoiding any risk of error and therefore of compromise in the introduction of a USB key into a device. dedicated to a type of information, for example dedicated to classified information.
[0010] The solution provided is a device for connecting a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices, device characterized in that it comprises: - a first tubular part with a partially hollowed-out base of a section part at least equal to the cross-section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising a first coding pattern; - a second tubular part comprising a second pattern, complementary to the first pattern and capable of being fixed on a part of the external face of the body of the first USB key and at a distance from the free end of the connector such that when this second tubular part is placed against the first part or embedded in the latter and the first and second patterns cooperate, the USB connector of the first USB key is inserted inside the female USB socket of the first device; - a third tubular part with a partially hollowed-out base of a section part at least equal to the cross-section of said connector and capable of being fixed around a USB socket of the second electronic device and arranged so as to make this socket accessible to the connector of the second key, this first part comprising a third geometric coding pattern; - a fourth tubular part comprising a fourth coding pattern, complementary to the third pattern and capable of being fixed on a part of the external face of the body of the second USB key and at a distance from the free end of the connector such that when this fourth tubular part is placed against the third part or embedded in the latter and the third and fourth patterns cooperate, the USB connector of the second USB key is inserted inside the female USB socket of the second device; the first, second, third and fourth coding patterns being such that when the first part is fixed on the first device and the fourth part fixed on the second USB key, the placement of the second key against the first tubular part or its embedding does not allow the introduction of its connector inside the female plug of the first device and when the third part is fixed on the second device and the second part fixed on the first USB key, the placement of this key against the third tubular part or its embedding does not allow the introduction of its connector inside the female plug of the second device.
[0011] According to an additional characteristic, each of the first, second, third and fourth tubular parts comprises at least one geometric coding element.
[0012] According to a particular characteristic, the at least one geometric coding element is constituted by a mortise or a notch, a tenon, a slide or a slider.
[0013] According to a particular characteristic making it possible to facilitate the differentiation between, on the one hand, the first and second tubular parts and, on the other hand, between said third and fourth tubular parts, they are, at least in part, of different colors. They may, for example, be made of plastic and tinted throughout. They may, for example, be manufactured by molding or by 3D printing.
[0014] The invention also relates to an assembly formed by a first electronic device, a second electronic device, a first and a second USB key, this assembly implementing an equipment device according to the invention.
[0015] The invention also relates to a method for fitting a first and a second USB key respectively to a first dedicated electronic device and to a second dedicated electronic device each comprising at least one female USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB plug of one or other of said electronic devices, method implementing only a first tubular part with a first pattern and a second tubular part with a second pattern, these patterns being complementary in a single position of the first tubular part relative to the second, method characterized in that it consists of: - fixing a first tubular part on the first device and a second part on the body of the first USB key so that when the first and second patterns cooperate to be complementary, the male USB connector is inserted into the female plug of the first electronic device; - fix a third tubular part, identical to the first, on the second electronic device in a manner identical to the first but offset by a rotation angle of ir Rd; - fix a fourth tubular part, identical to the second, on the second USB key in an identical way to the second but offset by a rotation angle of ir Rd.
[0016] Such a method has several advantages: - a single pair of tubular parts is sufficient to connect a first USB key to a first electronic device and a second USB key to a second electronic device without being able to interchange them, which minimizes the number of tubular parts- different bulbs needed; - it is not possible to insert a USB flash drive upside down into a female plug of dedicated electronic equipment and thus damage the connector or the female plug. Brief description of the drawings
[0017] [Fig-1] shows a first example of a first tubular part of a device of apparatus according to the invention.
[0018] [Fig.2] shows a first example of a second tubular part of a device of apparatus according to the invention
[0019] [Fig.3] shows a diagram of this second tubular part fixed to the body of a key USB.
[0020] [Fig.4] illustrates the proper positioning of the first and second tubular parts against each other.
[0021] [Fig.5] shows a first example of a third tubular part of a device of apparatus according to the invention.
[0022] [Fig.6] shows a first example of a fourth tubular part of a device of apparatus according to the invention.
[0023] [Fig.7] shows the proper positioning of the third and fourth parts for the implementation of the invention.
[0024] [Fig.8] shows a second example of a second tubular part of a device of apparatus according to the invention.
[0025] [Fig.9] shows a second example of a second tubular part of a device of apparatus according to the invention.
[0026] [Fig. 10] shows a third example of a first tubular part, or of a third part of an apparatus device according to the invention.
[0027] [Fig. 11] shows a third example of a second tubular part, or a fourth part, of an apparatus device according to the invention.
[0028] [Fig. 12] shows a third example of a first tubular part, or of a third part of an apparatus device according to the invention.
[0029] [Fig. 13] shows a third example of a second tubular part, or a third part, of an apparatus device according to the invention.
[0030] [Fig.l] shows a first example of a first tubular part 1 of a device for connecting, according to the invention, a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0031] This first tubular part 1 has a base 2 partially hollowed out by a part 3 of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising a first coding pattern 4. This tubular part 1 comprises two parallel transverse plates 5 and 6 secured to the base 2 and arranged perpendicular to the latter. Each of these plates comprises a geometric coding element constituted by a notch, respectively 4i and 42, in the shape of a U at their free end opposite that secured to the base and arranged symmetrically with respect to a longitudinal plane of symmetry relating to each of these plates. These notches 4b 42 have a mortise function. Two buttresses 7 are arranged laterally.They connect the ends 8 of the plates at the level of their solidification to the base 2.
[0032] [Fig.2] shows a first example of a second tubular part of an apparatus device, according to the invention, for connecting a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0033] This second tubular part 11 is intended to cooperate with said first tubular part 1. It mainly comprises a tubular part 12 of rectangular internal cross-section and whose width is of the order of magnitude, and preferably equal, to that of said transverse parallel plates 5 and 6 of the first tubular part 1 and whose height is of the order of magnitude, and preferably equal, to that separating the upper face 9 of the plate 5, from the lower face of the plate 6.This second tubular part 1 comprises two tenons 13, 14, in the form of parallel plates whose dimensions are equal, apart from the clearances, to those of the notches 4b 42 and one of which is integral and continuous with an upper transverse face 15 of this second tubular part 11 and the other is integral and continuous with a lower transverse face 16, so that the main faces 16 of these tenons are opposite each other. These tenons constitute second geometric coding elements and are intended to be inserted into said notches 4b 42 and so that the transverse surfaces 15 and 16 are in contact with the transverse surfaces 17, 18 of the free ends of said plates 5 and 6 of the first tubular part. These tenons 13, 14 constitute a second coding pattern.
[0034] [Fig.3] shows a diagram of this second tubular part 11 attached to a USB key 100. The latter mainly comprises a male USB connector 101 and a key body 102 mainly containing a controller, a flash memory and a quartz oscillator. The second tubular part 11 is fixed to the body 102 of the USB key 100 by gluing at such a distance from the connector 101 that when the second tubular part 11 is placed against the first tubular part 1, as shown in [Fig.4] and the base is fixed on the first electronic device around a USB plug, the connector 101 is inserted inside the latter allowing a power supply to the key and an exchange of data between the first electrical device and the USB key.
[0035] [Fig.4] shows the proper positioning of the first and second tubular parts when the tenons 13, 14 of one are engaged in the notches 4b 42 of the other.
[0036] [Fig. 5] shows a first example of a third tubular part 21 of a device according to the invention for connecting a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0037] This third tubular part 21 has a base 22 partially hollowed out with a part 23 of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising a third coding pattern 24b 242, 243 and 244. This tubular part 21 comprises two transverse parallel plates 25 and 26 integral with the base 22 and arranged perpendicular to the latter. Each of these plates comprises geometric coding elements constituted by two notches 24b 242, respectively 243 and 244, in the shape of a U at their free end opposite that, 28, which is integral with the base.Furthermore, in this embodiment, the first notch 24 of the first plate 25 is arranged on one side of a longitudinal axis of symmetry OX' relative to this plate and the second notch 242 of the first plate 25 is arranged symmetrically and on the other side of said axis OX'. The same applies to the third and fourth notches on the second plate 26. These notches 24b 242, 243 and 244 have a mortise function. Two buttresses 27, 28 are arranged laterally. They connect the ends 29 of the plates at the level of their attachment to the base 22.
[0038] [Fig. 6] shows a first example of a fourth tubular part 31 of an apparatus device, according to the invention, for a first and a second USB key. respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0039] This fourth tubular part 31 is intended to cooperate with said third tubular part 21. It mainly comprises a tubular part 32 of rectangular internal cross-section and whose width is of the order of magnitude, and preferably equal, to that of said transverse parallel plates 25 and 26 of the first and whose height is of the order of magnitude, and preferably equal, to that separating the upper face 29 of the plate 25, from the lower face of the plate 26.This fourth tubular part 31 comprises four tenons 34b 342, 343, 344 in the form of parallel plates whose dimensions are equal, with a clearance allowing, to those of the notches 24b 242, 243 and 244 of the third tubular part 21 which allows their introduction into the latter, and two of which are integral and continuous with an upper transverse face 35 of this fourth tubular part 31 and two others, 343, 344, integral and continuous with a lower transverse face 36, so that the main faces 16 of these tenons are opposite each other two by two.These tenons 34b 342, 343, 344 constitute second geometric coding elements and are intended to be inserted into said notches 24b 242, 243 and 244 of the third tubular part 21 and so that the transverse surfaces 35 and 36 are in contact with the transverse surfaces 37, 38 of the free ends of said plates 25 and 26 of the third tubular part 21. These tenons 34b 342, 343, 344 constitute a fourth coding pattern.
[0040] [Fig.7] shows the correct positioning of the third and fourth tubular parts when the tenons 34b 342, 343, 344 of the fourth part are engaged in the notches 24b 242, 243 and 244 of the third part. In this position, and when this fourth part is fixed on a USB key according to the same principles as in the context of [Fig.3] and the third part is fixed around a female plug of a second electronic device, the male connector of the USB key is inside the plug of this electronic device, thus allowing the power supply of the USB key as well as the exchange of data between the USB key and this electronic device.
[0041] Given the difference in geometry between the coding patterns of the first and second tubular parts and those of the third and fourth tubular parts, it is not possible to insert the male connector of the USB key fixed to the fourth tubular part inside the plug of the first electronic device around which the first tubular part 1 is fixed. Similarly, it is not possible to insert the male connector of the USB key on which the second tubular part is fixed inside the plug of the second electronic device around which the third tubular part is fixed. To implement the invention, it is sufficient to associate, for example, first and second tubular parts with USB keys and electronic devices dedicated to classified information and the third and fourth tubular parts with USB keys and electronic devices dedicated to unclassified information. Thus, it is no longer possible to insert one of these USB keys dedicated to unclassified information into a plug of an electronic device dedicated to classified information.
[0042] [Fig.8] shows a second example of a first tubular part 41 of a device for fitting, according to the invention, a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0043] This first tubular part 41 has a base 42 partially hollowed out by a part of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising a fifth coding pattern 44b 442. This tubular part 41 comprises a main tubular part 45 of rectangular internal cross section and formed of two parallel transverse main plates 46, 47 connected to each other by two lateral plates 48, 49. Each of these lateral plates comprises, on its internal face respectively 50 and 51 and in its middle part, a geometric coding element constituted by a longitudinal groove 44b respectively 442. These longitudinal grooves 44b 442 constitute a fifth coding pattern and have a sliding function.
[0044] [Fig.9] shows a second example of a second tubular part of an apparatus for connecting, according to the invention, a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0045] This second tubular part 61 is intended to cooperate with said first tubular part 51 according to the second embodiment. It mainly comprises a tubular part 62 of rectangular external cross-section and whose di dimensions are of the order of magnitude, and preferably equal to the clearances, of those of the internal cross-section of the main tubular part 45. This second tubular part 61 comprises two sliders 63, 64 arranged longitudinally respectively in the middle part of a first lateral external face 65 and in the middle part of the other lateral external face 66 of the tubular part 62. The dimensions of these sliders are, at the level of their cross-section, slightly smaller than those of said longitudinal grooves 44b 442 so as to allow the sliding of this second tubular part 62 inside the first tubular part 51.
[0046] These slides 63, 64 constitute a sixth coding pattern and are therefore intended to cooperate with the fifth coding pattern 44b 442 of the tubular part 51.
[0047] [Fig. 10] shows a third example of a first tubular part, or a third tubular part, of an equipment device, according to the invention, of a first and a second USB key respectively to a first electronic device and to a second electronic device, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0048] This first tubular part 71 has a base 72 partially hollowed out by a part of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising geometric coding elements constituted by parallel longitudinal grooves 74b 742, 743 and 744. This tubular part 71 comprises a main tubular part 75 of rectangular internal cross section and formed of two parallel transverse main plates 76, 77 connected to each other by two lateral plates 78, 79. Each of these lateral plates comprises, on its internal face, respectively 80 and 81, two parallel longitudinal grooves 74b 742, respectively 743 and 744.
[0049] These longitudinal grooves 74b 742, 743 and 744 constitute a seventh coding pattern and have a sliding function.
[0050] [Fig. 11] shows a third example of a second tubular part, or a fourth part, of an equipment device, according to the invention, of a first and a second USB key respectively to a first electronic device and to a second electronic device, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices.
[0051] This second tubular part 81 is intended to cooperate with said first tubular part 61 according to the second embodiment. It mainly comprises a tubular part 82 of rectangular external cross-section and whose dimensions are of the order of magnitude, and preferably equal to the clearances, of those of the internal cross-section of the main tubular part 75 of the first tubular part 71. This second tubular part 81 comprises, on each of its lateral external faces 85, 86, two slides 84b 842, respectively 843 and 844> arranged longitudinally and parallel. The dimensions of these slides are, at the level of their cross-section, slightly smaller than those of said longitudinal grooves 74b 742, 743 and 744 so as to allow the sliding of this second tubular part 82 inside the first tubular part 71.
[0052] These slides 84b 842, respectively 843 and 844, constitute an eighth coding pattern and are therefore intended to cooperate with the seventh coding pattern 74b 742, 743 and 744 of the first tubular part 71.
[0053] [Fig. 12] shows a fourth example of a first tubular part, or a third part, of an apparatus device, according to the invention.
[0054] This first tubular part 91 has a base 92 partially hollowed out by a part of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising geometric coding elements constituted by a longitudinal groove 94. This tubular part 91 comprises a main tubular part 95 of rectangular internal cross section and formed of two parallel transverse main plates 96, 97 connected to each other by two lateral plates 98, 99. The lateral plate 98 comprises, on its internal face, and in its middle part, a longitudinal groove 94.
[0055] This longitudinal groove 94 constitutes a ninth coding pattern and has a sliding function.
[0056] It can be seen that in this exemplary embodiment, there is no symmetry of geometric elements.
[0057] [Fig. 13] shows a fourth example of a second tubular part, or a fourth part, of an apparatus device, according to the invention.
[0058] This second tubular part 111 is intended to cooperate with said first tubular part 91 according to the fourth embodiment. It mainly comprises a tubular part 112 of rectangular external cross-section and whose dimensions are of the order of magnitude, and preferably equal to the clearances, of those of the internal cross-section of the main tubular part 95 of the first tubular part 91. This second tubular part 111 comprises, on one, 115, of its lateral outer faces 115, 116, a slider 114 arranged longitudinally and in its middle part. The dimensions of this slider are, at the level of its cross section, slightly smaller than those of said longitudinal groove 94 so as to allow the sliding of this second tubular part 112 inside the first tubular part 91.
[0059] This slide 114 constitutes a tenth coding pattern. It is intended to cooperate with the ninth coding pattern of the first tubular part 91.
[0060] The configuration of figures 12 and 13 makes it possible to prevent the male connector from being inserted in the wrong direction into the plug of the dedicated electronic device into which it is to be inserted.
[0061] In addition, a single pair of tubular parts is sufficient to pair a first USB key with a first electronic device and a second USB key with a second electronic device, which minimizes the number of different tubular parts required. For this, it is sufficient to offset, on the second USB key and on the electronic device, a pair of a rotation angle of irRd relative to that placed on the first USB key and the first electronic device.
[0062] Obviously, many modifications can be made to the embodiments presented without departing from the scope of the invention. Thus, the first tubular part, respectively the third, must comprise at least one coding pattern, such as for example a mortise, a tenon, a slide or a slide and it can have two or four as in the examples but can also have three, five or even more. Obviously in this case, the second tubular part, respectively the fourth, must preferably have the same number of patterns. However, it could also have fewer or more if some of the patterns, for example in the form of a mortise or a slide, do not have a complementary pattern on the first part, respectively the third part.
Claims
1. Claims Device for connecting a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body (102) and, on the other hand, the same USB connector (101) having a free end and capable of being inserted into a female USB socket of one or other of said electronic devices, device characterized in that it comprises: - a first tubular part (1) with a base (2) partially hollowed out with a part of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the first electronic device and arranged so as to make this socket accessible to the connector of the first key, this first part comprising a first coding pattern (4, 4b 42) - a second tubular part (11) comprising a second pattern (13, 14) complementary to the first pattern (4, 4b 42) and capable of being fixed on a part of the external face of the body of the first USB key and at a distance from the free end of the connector such that when this second tubular part is placed against the first part or embedded in the latter and the first and second patterns cooperate, the USB connector of the first USB key is inserted inside the female USB socket of the first device; - a third tubular part (21) with a base (22) partially hollowed out with a part of section at least equal to the cross section of said connector and capable of being fixed around a USB socket of the second electronic device and arranged so as to make this socket accessible to the connector of the second key, this first part comprising a third geometric coding pattern (24b 242, 243 244); - a fourth tubular part (31) comprising a fourth coding pattern (34b 342, 343, 344) complementary to the third pattern (24b 242, 243 244) and capable of being fixed on a part of the external face of the body of the second USB key and at a distance from the free end of the connector such that when this fourth tubular part is placed against the third part or embedded in the latter and the third and fourth patterns cooperate, the USB connector of the second USB key is inserted inside the female USB socket of the second device; the first, second, third and fourth coding patterns being such that when the first part (1) is fixed on the first device and the fourth part (31) fixed on the second USB key, the placement of the second key against the first tubular part (1) or its embedding does not allow the introduction of its connector inside the female plug of the first device and when the third part (21) is fixed on the second device and the second part (11) fixed on the first USB key, the placement of this key against the third tubular part (21) or its embedding does not allow the introduction of its connector inside the female plug of the second device.
2. An apparatus device according to claim 1, characterized in that each of the first, second, third and fourth tubular parts (1, 11, 21, 31) comprises at least one geometric coding element (4 b 42, 13, 14, 24b 242, 243 244, 34b 342, 343, 344).
3. Fitting device according to claim 2, characterized in that the at least one geometric coding element is constituted by a mortise or a notch (4b 42, 24b 242, 243 244), a tenon (13, 14, 34b 342, 343, 344), a slide (44b 442) or a slide (63, 64).
4. Apparatus device according to any one of claims 1 to 3, characterized in that on the one hand the first and second tubular parts (1, 11) and, on the other hand, between said third and fourth tubular parts (21, 31) are, at least in part, of different color.
5. Method for fitting a first and a second USB key respectively to a first electronic device and to a second electronic device each comprising at least one female USB plug, these first and second USB keys comprising on the one hand, preferably, the same key body and, on the other hand, the same USB connector having a free end and capable of being inserted into a female USB plug of one or other of said electronic devices, method implementing only a first tubular part with a first pattern and a second tubular part with a second pattern, these patterns being complementary in a single position of the first tubular part relative to the second,method characterized in that it consists of: - fixing a first tubular part (91) on the first device and a second part (111) on the body of the first USB key so that when the first and second patterns cooperate to be complementary, the male USB connector is inserted into the female plug of the, first electronic device; - fixing a third tubular part (91), identical to the first, on the second electronic device in a manner identical to the first but offset by an angle of rotation of ir Rd; - fix a fourth tubular part (111), identical to the second, on the second USB key in an identical manner to the second but offset by a rotation angle of ir Rd.