Cryptanalysis of Lee and Chang's ID-based information security functions
Recently, Lee and Chang proposed three ID-based information security functions that can be applied to the design of two authenticated key distribution schemes as well as three digital signature schemes (see Computer Communications 20 (14) (1997) 1301). They also claimed that security analyses of the proposed schemes are based on the difficulty of solving factorization, discrete logarithms module a composite, and the Diffie-Hellman problem. The authors will demonstrate several attacks on Lee and Chang's schemes, and show that all these schemes cannot fulfil the claimed security requirements. (C) 1999 Elsevier Science B.V. All rights reserved.
key distribution digital signature id-based public key system