Efficient encryption and authentication for data processing...

Details Efficient encryption and authentication for data processing... Efficient encryption and authentication for data processing...

H - Electricity

04

L

H04L 9/32 (2006.01) H04L 9/28 (2006.01)

Patent

CA 2493567

Methods and apparatus are presented for encrypting and authenticating data, wherein some data is encrypted and some data is not encrypted, but all of the data is authenticated. Different formulations for authentication blocks are used according to whether a block of data occupies a cleartext position (442A, 442B, 442C) or ciphertext position. (444A 444B, 444C, 444D) The authentication blocks are then combined to form a checksum, which is encrypted to form an authentication tag.

L'invention concerne des procédés et un appareil destinés à crypter et à authentifier des données, certaines données étant cryptées et d'autres ne l'étant pas, mais toutes étant authentifiées. Différentes formulations destinées à l'authentification de blocs de données sont utilisées en fonction du fait qu'un bloc de données occupe ou non une position de texte clair (442A, 442B, 442C) ou une position de texte chiffrée (444A, 444B, 444C, 444D). Les blocs d'authentification sont ensuite combinés en vue de former un total de contrôle, qui est crypté afin de produire une étiquette d'authentification.

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