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Chosen ciphertext security (CCA security) is a very important security notion for public key encryption. Until now, there are numerous ways to construct CCA secure public key encryption (PKE) or key encapsulation mechanism (KEM) schemes. In this paper, we propose a new CCA secure Elgmal scheme, which is proved secure in the random oracle based on the CDH assumption, has almost no additional overhead...
Functional encryption provides more sophisticated and flexible relations between the encryption-key and decryption-key. Previous FE systems only allow for functionalities that take in a single authority key and plaintext as inputs. In this paper, a Multiple-Authority-Keys Attribute-Based Encryption system is presented. The new propose scheme allows descriptor to learn functionalities that take in...
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,...
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...
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. They predicated that proxy re-encryption and re-signature will play an important role in our life. In 2007, Matsuo proposed the concept of four...
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