Cryptographic system with masking

Details Cryptographic system with masking Cryptographic system with masking

1997-07-17

1998-06-16

Tarcza, Thomas H.

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

380 6, 380 29, 380 37, 380 43, 380 44, 380 45, H04K 102, H04K 100, H04K 104, H04K 106, H04L 900

Patent

active

057683905

ABSTRACT:
A system for cryptographically transforming a sequence of input blocks of plaintext or ciphertext data into corresponding sequence of output blocks of data while providing enhanced protection against cryptographic attacks. Each input block is enciphered using a first key to generate a first encryption product, which is combined with a first secret masking value generated independently of the input blocks to generate a masked first encryption product. Each masked first encryption product is then enciphered using a second key to generate a second encryption product, which is combined with a second secret masking value generated independently of the input blocks to generate a masked second encryption product. Finally, each masked second encryption result is enciphered using a third key to generate an output block corresponding to the input block.

REFERENCES:
patent: 5425103 (1995-06-01), Shaw
patent: 5442705 (1995-08-01), Miyano
patent: 5619576 (1997-04-01), Shaw
"Acronyms, Initialisms & Abbreviations Dictionary", .COPYRGT. 1996 p. 798.
Schneier "Applied Cryptography", pp. 366-368 (1995) John Wiley & Sons.
Bruce Schneier, "Applied Cryptography", 2nd Ed. pp. 270-278 and 358-366. (J. Wiley & Sons Oct. 1995).
Jones, T.C., "Cipher-Chain-Cipher Modes of Operation of Block Ciphers", draft of Mar. 17, 1995.
Meyer, C.H. and Matyas, S.M., "Cryptography: A New Dimension in Computer Data Security", A Guide for the Design and Implementation of Secure Systems, John Wiley & Sons, Inc., New York, 1982, pp. 113-191.
Mitchell, C.J. and Varadharajan, V., "Modified Forms of Cipher Block Chaining", Computers and Security, 10, 1991, pp. 37-40.

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