256 results about "Cryptographic nonce" patented technology

A payment card financial transaction authenticates for providing overall financial network security computes a number of results from a cryptographic key that match values that were selectively used to personalize individual payment cards with their individual user identification and account access codes. An account access code is later presented daring a financial transaction involving at least one of those individual payment cards. A dynamic portion is included in a merchant's magnetic reading of the payment card. Then authenication can proceed by matching it with values computed from the cryptographic key.

An on-line value bearing item (VBI) printing system that includes one or more cryptographic modules and a central database is disclosed. The cryptographic modules are capable of implementing the USPS Information Based Indicia Program Postal Security Device Performance Criteria and other required VBI standards. The modules encipher the information stored in the central database for all of the on-line VBI system customers and are capable of preventing access to the database by unauthorized users. Additionally, each cryptographic module is capable of providing audit support functions that enable secure logging of all sensitive actions.

This patent application describes a data processing system and method for securely storing and retrieving a cryptographic secret from a plurality of network-enabled clients. The cryptographic secret is encrypted using a split key arrangement where a first key component is generated and stored inside a hardware security token and a second key component is generated and stored on a server. Random variables and dynamic passwords are introduced to mask the key components during transport. In order to gain access to the first password, the user is required to enter his or her PIN. The key encryption key is generated by performing a series of XOR operations, which unmasks the first and second key components on a client allowing generation of a symmetric key The symmetric key is used to encrypt the cryptographic secret at the user's normal client and decrypt the cryptogram at another client lacking the cryptographic secret. The applications performing the cryptographic functions are intended as browser applets, which remains in transient memory until the user's session has ended. At which time, the key encryption key and cryptographic secret are destroyed.

A method of computing a cryptographic key to be shared between a pair of correspondents communicating with one another through a cryptographic system is provided, where one of the correspondents receives a certificate of the other correspondents public key information to be combined with private key information of the one correspondent to generate the key. The method comprises the steps of computing the key by combining the public key information and the private key information and including in the computation a component corresponding to verification of the certificate, such that failure of the certificate to verify results in a key at the one corespondent that is different to the key computed at the other correspondent.

In systems for establishing a cryptographic key depending on a physical uncloneable function (PUF) it may be a problem that internal information correlated with the cryptographic key is leaked to the outside of the system via a side-channel. To mitigate this problem a cryptographic system for reproducibly establishing a cryptographic key is presented. The system comprises a physical system comprising a physical, at least partially random, configuration of components from which an initial bit-string is derived. An error corrector corrects deviations occurring in the initial bit-string. Through the use of randomization the error corrector operates on a randomized data. Information leaking through a side channel is thereby reduced. After error correction a cryptographic key may be derived from the initial bit-string.

A method of producing a stream of digital data. The method includes determining a plurality of portions within the stream of digital data, such that a portion of the stream of digital data is encrypted with an encryption key that is capable of being decrypted by a decryption key and the portion including therein another decryption key capable of decrypting a subsequent portion of the stream of digital data, and the subsequent portion of the stream of digital data is encrypted with another encryption key that is capable of being decrypted by the another decryption key. The method also includes transmitting the stream of digital data, including the portion and the subsequent portion.

Embodiments of the present invention provide a system for authenticating records belonging to an individual or entity and providing authorized access of said records to service providers. Embodiments of the invention utilize a private blockchain to store various types of records to be conveyed to the service providers. In this way, the individual or entity may securely store on the blockchain all records relevant to service providers, then provide the service providers with secured access to said records such that the providers may access only the specific records for which they are authorized, e.g. a healthcare provider may access only the healthcare records on the blockchain.

A smart card, system, and method for securely authorizing a user or user device using the smart card is provided. The smart card is configured to provide, upon initialization or a request for authentication, a public key to the user input device such that the PIN or password entered by the user is encrypted before transmission to the smart card via a smart card reader. The smart card then decrypts the PIN or password to authorize the user. Preferably, the smart card is configured to provide both a public key and a nonce to the user input device, which then encrypts a concatenation or other combination of the nonce and the user-input PIN or password before transmission to the smart card. The smart card reader thus never receives a copy of the PIN or password in the clear, allowing the smart card to be used with untrusted smart card readers.

A system and method for producing cryptographic keys for use by an embedded processing device within a manufactured product. A pseudo random number generator is seeded with entropy data gathered by the embedded device, and the result is used to generate a public-private key pair. The process can be carried out during manufacturing so that the public key of each manufactured product can be stored in a database along with a unique identifier for the embedded device associated with the key. In one particular example, a vehicle having an installed telematics unit uses the key generating process to self-generate keys using entropy data available to the vehicle.

For digital rights management (DRM), a method for performing authentication between a device and a portable storage, which is performed by the device, includes transmitting a first key to the portable storage, receiving a third key and a first encrypted random number obtained by encrypting a first random number using the first key from the portable storage and decrypting the first encrypted random number using a second key related with the first key, generating a second encrypted random number by encrypting a second random number using the third key and transmitting the second encrypted random number to the portable storage, and generating a session key using the first random number and the second random number. The technique guarantees secure authentication between the device and the portable storage for DRM.

A system, method and article of manufacture are provided for affording a cryptographic service utilizing a server on a network. Initially, a client is identified utilizing the network. A first key is established, and a tunnel is generated on the network. Thereafter, information is received at the server from the client utilizing the tunnel. Such information is encrypted by the client using the first key. At the server, cryptographic work is performed using the first key.

A system and method are described supporting secure implementations of 3DES and other strong cryptographic algorithms. A secure key block having control, key, and MAC fields safely stores or transmits keys in insecure or hostile environments. The control field provides attribute information such as the manner of using a key, the algorithm to be implemented, the mode of use, and the exportability of the key. A MAC algorithm is applied across the key and control for generating a MAC field that cryptographically ties the control and key fields together. Improved security is provided because tampering with any portion of the key block results in an invalid key block. The work factor associated with any manner of attack is sufficient to maintain a high level of security consistent with the large keys and strong cryptographic algorithms supported.

A cryptographic key management method and device are provided by which cryptographic keys of multiple nodes can be managed easily and stably. A system includes at least one first node and a plurality of second nodes connected to the first node, and the first node individually generates and consumes a cryptographic key with each of the second nodes connected to the first node itself. A cryptographic key management device in such a system has a monitor that monitors the stored key amounts of cryptographic keys of the individual second nodes, stored at the first node, and a key management control section that performs key generation control on the first node, based on the stored key amounts.

Countermeasures for differential power or electromagnetic analysis attacks are provided with the definition and use of key encryption masks and masked substitution tables in a cryptographic process. Different key encryption masks and masked substitution tables are applied to different portions of masked keys used in the cryptographic process and are rotated as the cryptographic operations are carried out. The rotation of the key encryption masks and the masked substitution tables is non-uniform. Input and output masking for the substitution tables is provided.

Provided is a process that includes: calling a program executed on a decentralized computing platform configured to persist state to a blockchain, the call requesting the program to release the software asset to the production environment, wherein: respective instances of the program are configured to publish release documentation by which provenance of the software asset is verifiable to the blockchain, respective instances of the program are configured to verify a cryptographic signature associated with the software asset, the cryptographic signature establishes that the software asset being released has not been tampered with subsequent to signing, the cryptographic signature establishes that the releasing entity or a proxy of the releasing entity has access to a cryptographic key by which the cryptographic signature was formed, and the decentralized computing platform is configured to reach a consensus verification determination among verification results from the replicated instances of the program.

A secure repository individualized for a hardware environment and a method and system for providing the same. The secure repository includes a hidden cryptographic key and code that applies the key without requiring access to a copy of the key. The code that implements the secure repository is generated in a manner that is at least partly based on a hardware ID associated with the hardware environment in which the secure repository is to be installed, and may also be based on a random number. Cryptographic functions implemented by the secure repository include decryption of encrypted information and validation of cryptographically signed information. The secure repository may be coupled to an application program, which uses cryptographic services provided by the secure repository, by way of a decoupling interface that provides a common communication and authentication interface for diverse types of secure repositories. The decoupling interface may take the form of a single application programmer interface (API) usable with multiple dynamically linkable libraries.

A cryptographic device comprises a data stream interceptor, a main controller receiving input from the data stream interceptor, and a pair of data generating and storage controllers adapted to perform data transfer protocols with corresponding peer controllers of a data generating device and a data storage device, respectively, on command from the main controller. The cryptographic device further comprises a cipher engine programmed to transparently encrypt and decrypt data streams flowing between the data generating device and data storage device on command from the main controller. The cryptographic device does not utilize system resources associated with the data generating and storage devices during operation.

A method and apparatus is presented for revoking cryptographic keys within a distributed ledger system in which no central trusted authority is available, consisting of sending a key revocation message by a network connected device to other network connected devices over a peer-to-peer network for inclusion in a ledger. In one embodiment the revocation message is signed using a private key of a public/private key pair to be revoked. In another embodiment an authorization for future revocation of the public/private key pair by a plurality of other public/private keys is sent for inclusion in the ledger, and subsequently the key revocation message is signed with one of the private keys of the plurality of public/private key pairs before sending the key revocation message. Once a valid key revocation message is included in the ledger, any future request to include a message signed by the revoked cryptographic key is rejected.

Disclosed is a method and apparatus for reducing communication system downtime when enabling cryptographic operation of a cryptographic system of the communication system where the cryptographic system includes a first cryptographic device operatively coupled to a plurality of second cryptographic devices via a communication network of the communication system. The method includes causing a pass-through mode of the second cryptographic devices to be suspended, sequentially determining a state of each of the second cryptographic devices, causing the second cryptographic devices and the first cryptographic device to substantially simultaneously operate in a secure mode if each of the second cryptographic devices is determined to have a first state, and causing the second cryptographic devices and the first cryptographic device to operate in the pass-through mode if at least one of the plurality of second cryptographic devices is determined to have a second state.

Methods, computer-readable media, and apparati for securely distributing a cryptographic key (C) from a first party(s) to a second party(s). A method embodiment of the present invention comprises the steps of combining (steps 1 and 2) the cryptographic key (C) with a transport key (T) to form a key set; encrypting (step 7) the key set to form an encrypted key set; distributing (step 8) the encrypted key set across a medium (3); and decrypting (step 9) the encrypted key set to reconstitute the cryptographic key (C) and the transport key (T).

A process for creating and managing pairs of asymmetrical cryptographic keys and/or certificates associated with the pairs of keys, each pair of keys and associated certificates being intended for an object managed by a computer system. The process includes creating an individual request for creating and/or certifying at least one pair of keys for an object of the system that lacks a pair of keys or a certificate for its pair of keys.