Efficient encryption and authentication for data processing...

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

2005-09-27

2005-09-27

Sheikh, Ayaz (Department: 2131)

Cryptography

Communication system using cryptography

Time segment interchange

C380S028000, C380S030000, C380S042000, C380S043000, C380S277000, C713S150000, C713S151000, C713S168000, C713S171000

Reexamination Certificate

active

06950517

ABSTRACT:
Methods and apparatus are presented herein for encrypting and authentication data, such that some of data can be transmitted in the clear but still be authenticated by the sender. A set of cleartext positions and/or a set of ciphertext positions are used to specify which data blocks will be used to generate an input checksum value and an output checksum value. These checksums are then used to generate an authentication tag.

REFERENCES:
patent: 4918728 (1990-04-01), Matyas et al.
patent: 2001/0046292 (2001-11-01), Gligor et al.
patent: 2002/0071552 (2002-06-01), Rogaway
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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