| S. Brands. An Ecient O-Line E-Cash Scheme System Based on the Representation Problem. CWI TR CS-R9323. |
....is a safe RSA modulus. Given an element w 2 Z n n f1; 1g of ord(w) p either gcd(w 1; n) or gcd(w 1; n) is a prime factor of n. 4. 2 Discrete Logarithm Related Cryptographic Setting The Decisional Die Hellman Assumption (DDHA) This assumption was rst explicitly introduced by Brands [B93], although it was implicitly assumed in earlier literature. De nition 3. Decisional Die Hellman Problem) Let G = hgi be a cyclic group generated by g, where jord(G )j = l G . Given g, g , g , and g 2 G , the Decisional Die Hellman Problem consists of deciding whether g . ....
S. Brands. An Ecient O-Line E-Cash Scheme System Based on the Representation Problem. CWI TR CS-R9323.
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