Fast encryption and authentication for data processing systems

Details Fast encryption and authentication for data processing systems Fast encryption and authentication for data processing systems

2007-12-04

2007-12-04

Arani, Taghi (Department: 2139)

Cryptography

Communication system using cryptography

Time segment interchange

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

Reexamination Certificate

active

10205430

ABSTRACT:
Methods and apparatus are presented for secure, authenticated communication and data storage. The methods can be based on other methods such as IAPM, in which the encryption and authentication keys are of the same strength. In the HR-IAPM mode, a sender encrypts the data as in the IAPM mode using two encryption keys K0and K1. The sender then XORs the plaintexts with corresponding ciphertexts, and combines the results to form a checksum This checksum is encrypted under the authentication key K2, this value is appended to the encrypted message as a message authentication code (MAC). The receiver decrypts as with IAPM, XORs the plaintexts with the corresponding ciphertexts and combines these values to form a checksum. The receiver then encrypts the checksum under the authentication key K2and verifies that the resulting value agrees with the MAC. The HR mode allows blocks to be sent un-encrypted if desired.

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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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