A digital signature scheme secure against adaptive chosen-message attacks

An enhanced security model for proxy signature schemes is formalized. In the new model, we consider chosen key and chosen warrant attacks which exist in real environment but were neglected in previous security models. Then we propose a proxy signature ...

We design a secure multicast stream signature scheme which can resist adaptive chosen message attack through splitting a multicast stream into a sequence of blocks. Firstly, we propose the definition of one-time block signature scheme and its ...

Recently, at Crypto 2008, Boneh, Halevi, Hamburg, and Ostrovsky BHHO solved the long-standing open problem of "circular encryption," by presenting a public key encryption scheme and proving that it is semantically secure against key dependent chosen ...