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Cipher processing apparatus, data converting method, data converting program, recording medium and integrated circuit

A technology for encryption processing and data conversion, which is applied to encryption devices with shift registers/memory, secure communication devices, encoding/decoding devices, etc. , the effect of reducing the size of the door

Active Publication Date: 2009-07-08
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, in order to achieve high disruptiveness by the above-mentioned conventional technology, a plurality of alternative processes are required, and a plurality of gates are required to realize this alternative process by hardware, so there is a problem that the gate size of the hardware cannot be reduced.

Method used

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  • Cipher processing apparatus, data converting method, data converting program, recording medium and integrated circuit
  • Cipher processing apparatus, data converting method, data converting program, recording medium and integrated circuit
  • Cipher processing apparatus, data converting method, data converting program, recording medium and integrated circuit

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Embodiment Construction

[0089] An encrypted communication system according to one embodiment of the present invention will be described.

[0090] figure 1 The structure of the encryption communication system 1 which connects the encryption apparatus 2 and the decryption apparatus 3 via the communication path 4 is shown.

[0091] The encryption device 2 encrypts plaintext data PT of a message to be concealed input from the outside, and transmits encrypted data CT as a result of encrypting the plaintext data PT to the decryption device 3 via the communication path 4 .

[0092] The encryption device 2 performs encryption processing without performing substitution conversion, thereby reducing a part of the hardware scale for performing encryption processing as compared with the prior art.

[0093] The decryption device 3 receives the encrypted data CT sent by the encryption device 2 via the communication path 4, and generates decrypted data DT by decrypting the encrypted data CT, and outputs it to the o...

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Abstract

A cipher processing apparatus wherein the gate scale of hardware has been reduced as compared with a conventional one using a substitution cipher table and wherein a high misleading characteristic has been achieved. A data converting part included in an encrypting apparatus divides an input data of 256 bits into block data A1, B1, A2 and B2 of 32 bits each. A first fusing part (43) provides an exclusive-OR of A1 and B1 and also provides an exclusive-OR of A2 and B2. A first misleading part (44) branches each of A1, A2 and the results of exclusive-OR (C1,C2) into three block data, and cyclically shifts two of those three block data and then fuses all of the block data. A second fusing part (45) provides an exclusive-OR of D1 and E2, which are results from the first misleading part (44), and also provides an exclusive-OR of E1 and D2 that are also results from the first misleading part (44). A block coupling part (46) couples the calculation results of the second fusing part (45). A second misleading part (47) branches each of the coupled data into three block data, and cyclically shifts two of those three block data and then fuses all of the block data.

Description

technical field [0001] The present invention relates to an encryption processing device. Background technique [0002] The encryption processing device is used when encrypting and distributing digitized content such as music and video. In distribution of contents and the like, high security performance is required. In order to improve security performance, it is effective to improve the performance of scrambling distribution target data. [0003] For example, Patent Document 1 discloses a data encryption method for realizing high scrambling performance. [0004] In Patent Document 1, the input data is divided into a plurality of blocks of the same data length, at least one of exclusive OR, addition, and remainder is performed between the divided blocks of data, and the result of the operation is replaced ( Substitution) processing (table conversion operation processing), combined to carry out the diffusion of the above-mentioned input data. [0005] Patent Document 1: Ja...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09C1/00H04L9/06
CPCH04L9/0618H04L2209/24H04L9/06H04L2209/122
Inventor 野仲真佐男横田薰大森基司
Owner PANASONIC CORP
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