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In 1998, Blaze, Bleumer, and Strauss proposed a kind of cryptographic primitive called proxy re-encryption. In proxy re-encryption, a proxy can transform a ciphertext computed under Alice's public key into one that can be opened under Bob's decryption key. In this paper, with the help of the PKG, we construct a CCA-secure identity based proxy reencryption scheme based on a variant of BBi identity...
In this paper, a parallel multi-recipient signcryption scheme called ParaSC-BLS is proposed, which is semantic secure in random oracle model assuming that the GDH problem is hard. With pre-computing, the speedup of ParaSC-BLS is up to N. As the number of recipients growing, the computational overheads of ParaSC-BLS are constant. For the randomness reusing, cipher text is aggregated and the total transmission...
Blind signature is very important technology in secure e-commerce. Certificateless public key cryptography avoids the using of certificate in certificate-based public key signature scheme and removes key escrow in ID-based signature scheme. In this paper we introduce the notion of blind signature into certificateless public key cryptography and propose a concrete certificateless blind signature scheme...
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