An Unconditionally Secure Electronic Cash Scheme with Computational Untraceability

Akira OTSUKA  Goichiro HANAOKA  Junji SHIKATA  Hideki IMAI  

IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E85-A   No.1   pp.140-148
Publication Date: 2002/01/01
Online ISSN: 
Print ISSN: 0916-8508
Type of Manuscript: Special Section PAPER (Special Section on Cryptography and Information Security)
electronic cash,  information theoretic security,  unconditionally secure signature,  

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We have introduced the first electronic cash scheme with unconditional security. That is, even malicious users with unlimited computational ability cannot forge a coin and cannot change user's identity secretly embedded in each coin. While, the spender's anonymity is preserved by our new blind signature scheme based on unconditionally secure signature proposed in [7]. But the anonymity is preserved only computationally under the assumption that Decisional Diffie-Hellman Problem is intractable.