Abstract: The invention concerns the contact-less technology MIFARE, and describes a method to update a state by injecting an IV using a non-linear feedback shift register that makes use of only look-up tables and basic operations on 8-bit words.

Abstract: Privacy-preserving smart metering for a smart grid. Issuing a privacy-enhanced credential to a consumer node having smart meter. Operating the consumer node to associate an id with the credential and to use the id to report usage. Other systems and methods are disclosed.

Abstract: Privacy-preserving smart metering for a smart grid. Issuing a privacy-enhanced credential to a consumer node having smart meter. Operating the consumer node to associate an id with the credential and to use the id to report usage. Other systems and methods are disclosed.

Abstract: The invention concerns the contact-less technology MIFARE, and describes a method to update a state by injecting an IV using a non-linear feedback shift register that makes use of only look-up tables and basic operations on 8-bit words.

Abstract: The invention relates to a method for generating a session key between two communicating electronic devices not requiring any prerecorded information in one of the two devices and enabling the authentication of one of said devices. The method uses a close collaboration between a symmetrical algorithm and an asymmetrical algorithm.

Abstract: The present invention is a method to ensure a secure exchange of crypted numeric data between two entities, where their decryption depends to the approval of a third entity. The solution uses a combination of Identity Based Encryption scheme, and transcription trap use.

Abstract: The invention relates to a method and a system for conditional access making it possible to prevent the fraudulent use of a subscriber electronic device (1a, 1b, 1m) and to thus effectively combat the fraudulent making available of protected contents. The invention further relates to the adaptation of such a device as well as to a method allowing the revocation of the latter if it is deemed to be illicitly exploited or its possible reinstatement.

Abstract: A secure method for transmitting a control word between a server and a plurality of processing entities so as to respectively produce and utilize the control word. Preferably such a method is applied to the field of conditional access methods and systems for preventing the fraudulent use of compromised decryption keys resulting from a coalition of pirate hackers.

Abstract: The present invention provides a method for establishing a secure communication channel between a client (C) and a remote server (S), said client (C) and remote server (S) exchanging data through an intermediate entity (G), said client (C) having a long-term key pair (skc,pkc), said remote server generating an ephemeral key (sks,pks), the method comprising a mutual authentication step wherein the client (C) sends a public key (pkc) of said long-term key pair (skc, pkc) and the proof that said public key (pkc) is valid to the server (S), and wherein the remote server (S) sends the public key (pks) of said ephemeral key pair (sks,pks) to the client (C). The client (C) generates an ephemeral key pair (skCc,pkCc) and sends the public key (pKcc) of said ephemeral key pair (skcc,pkcc) to the server (S) so as to generate a secret common to the client (C) and to the remote server (S) for opening the secure communication channel.

Abstract: The invention relates to a method for preventing the fraudulent use of an electronic device and thus for effectively combating the fraudulent dissemination of protected content. The invention further relates to such a device as well as to a method enabling permanent revocation thereof if the device is considered to be unlawfully used or optional reinstatement of the device.

Abstract: A method and a generator for generating a pseudo-random data sequence (3), including combining means for combining data belonging to a plurality of initial data sequences (9a, 9b, 9c) using a procedure for searching for at least one search pattern.

Abstract: A method of generating a pseudorandom data sequence, wherein said pseudorandom data sequence is generated by a procedure for searching for a search pattern in an initial data sequence of N bits, said search procedure comprising the following steps: (a) detecting in said initial data sequence a particular search pattern of r bits that is one of a set of search patterns; (b) determining an output pattern of k bits by an operation that depends on the progress of the preceding step; and repeating the preceding steps (a) and (b) successively to form the pseudorandom data sequence from a succession of output patterns.

Abstract: The invention relates to a method for generating a session key between two communicating electronic devices not requiring any prerecorded information in one of the two devices and enabling the authentication of one of said devices. The method uses a close collaboration between a symmetrical algorithm and an asymmetrical algorithm.

Abstract: The present invention is a method to ensure a secure exchange of crypted numeric data between two entities, where their decryption depends to the approval of a third entity. The solution uses a combination of Identity Based Encryption scheme, and transcription trap use.

Abstract: The invention proposes an off-line divisible e-cash scheme where a user can withdraw a divisible coin of monetary value nL (n being for example equal to 2) that he can parceled and spend anonymously and unlinkably. The invention allows to protect the anonymity of honest users and to revoke anonymity only in case of cheat for protocols based on a tree structure without using a trusted third party.

Abstract: A method and a generator for generating a pseudo-random data sequence (3), including combining means for combining data belonging to a plurality of initial data sequences (9a, 9b, 9c) using a procedure for searching for at least one search pattern.

Abstract: A method of generating a pseudorandom data sequence, wherein said pseudorandom data sequence is generated by a procedure for searching for a search pattern in an initial data sequence of N bits, said search procedure comprising the following steps: (a) detecting in said initial data sequence a particular search pattern of r bits that is one of a set of search patterns; (b) determining an output pattern of k bits by an operation that depends on the progress of the preceding step; and repeating the preceding steps (a) and (b) successively to form the pseudorandom data sequence from a succession of output patterns.