Efficient encryption and authentication for data processing...

Electrical computers and digital processing systems: support – Multiple computer communication using cryptography – Particular communication authentication technique

Reexamination Certificate

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C713S150000, C713S151000, C713S168000, C713S171000, C380S028000, C380S030000, C380S037000, C380S042000

Reexamination Certificate

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06948067

ABSTRACT:
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 or ciphertext position. The authentication blocks are then combined to form a checksum, which is encrypted to form an authentication tag.

REFERENCES:
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patent: 2001/0046292 (2001-11-01), Gligor et al.
patent: 2002/0071552 (2002-06-01), Rogaway
patent: 2004/0017913 (2004-01-01), Hawkes et al.
P. Rogaway et al., OCB : A Block-Cipher Mode of Operation for Efficient Authenticated Encryption, Department of Computer Science, University of California at Davis, california,USA, Aug. 3, 2001.
V. Gligor et al., On Message Integrity in Symetric Encryption, Nov. 10, 2000, VDG, Inc., Chevy Chase Maryland, Nov. 10, 2000.
C. Jutla. Encryption Modes with almost free message integrity,. Advances in Cryptology-EUROCRYPT 2001. Lecture Notes in Computer Science, vol. 2045, B. Pfitzmann, ed., Springer-Verlag, 2001.

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