Chameleon hashing and signatures

Details Chameleon hashing and signatures Chameleon hashing and signatures

1998-02-11

2000-08-22

Swann, Tod R.

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Particular communication authentication technique

713170, 713176, 380 28, 380 30, H04L 932, H04L 928, H04L 930

Patent

active

061087831

ABSTRACT:
A method for providing a digital signature, "chameleon signatures", which provide the signer of a digital signature exclusive control to disclose the contents of the signed information to third parties. The signatures are closely related to "undeniable signatures", but allow for simpler and more efficient realizations. The method is essentially non-interactive requiring no communication between sender and receiver and do not involve the design and complexity of zero knowledge proofs on which traditional undeniable signatures are based. The method employs a combination of standard digital signing methods with a unique hash functions. These hash functions are characterized by the non-standard property of being collision resistant for the signer but collision tractable for the recipient.

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Schneier, B., "Applied Cryptography Second Edition: Protocols, Algorithms, and Source Code in C," John Wiley & Sons, Oct. 18, 1995, section 19.3, pp. 466-474.
Abdel-Azeem, E. et al., "Cryptographic Security Evaluation of MD4 Hash Function," Radio Science Conf., 1996. NRSC '96, Mar. 21, 1996, pp. 345-354 .

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