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Proxy re-encryption (PRE) allows a ciphertext computed under Alice's public key to be transformed to those which can be decrypted by Bob. Since Blaze et al. introduced the concept of proxy re-encryption in Eurocrypt'98, there are many results on proxy re-encryption. However, all the proxy re-encryption schemes proposed until now assume the proxy having no its own public/private keys. In this paper,...
Bionic evolution is an adaptive artificial intelligence technique; it mimics natural evolution process to solve optimization problems. In the paper, we present an improved proxy signature scheme based on bionic evolution. In the scheme, the original private key is generated with bionic evolution algorithm by a successive optimizing process. The optimizing selection algorithm renders effective protection...
Broadcast encryption schemes enable senders to efficiently broadcast ciphertexts to a large set of receivers in a way that only non-revoked receivers can decrypt them. Identity based broadcast encryption schemes are public key broadcast encryption using identity as the public key. In this paper, we show a novel way to construct identity based broadcast encryption. We introduce a new concept: one to...
Analyses were made on the security threats and weakness of present group signature schemes, and a dynamic group signature with forward security based on elliptic curves cryptosystem was presented. The identity blinding process and probabilistic encryption algorithm of the scheme enable the signature group to be dynamic without changing the group public key and private keys of all the group members...
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