Jian Ren

Publications (2)0 Total impact

• Conference Proceeding: Generalized Anonymous Information Sharing

  Jian Ren, Lein Ham
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  ABSTRACT: The concept of ring signature was first introduced by Rivest, Shamir and Tanman in 2001. In a ring signature, instead of revealing the actual identity of the message signer, it specifies a set of possible signers. The verifier can be convinced that the signature was indeed generated by one of the ring members, however, he is unable to tell which member actually produced the signature. Ring signature provides an elegant way to leak authoritative secrets in an anonymous way, and to implement designated-verifier signature schemes which can authenticate emails without undesired side effects. In this paper, we first propose a basic ring signature scheme based on the original ElGamal signature scheme. The proposed ring signature can achieve unconditional signer ambiguity and is secure against adaptive chosen message attacks. Comparing to ring signature based on RSA algorithm, the proposed generalized ring signature scheme has two advantages: (1) all ring members can use the same prime number p and operate in the same domain. (2) the proposed ring signature is inherently a convertible ring signature and enables the actual message signer to prove to a verifier that only he is capable of generating the ring signature. Then, based on the basic ring signature scheme, a generalized ring signature scheme is introduced to increase the level of confidence or enforce cross organizational joint message signing.
  Signal Processing Applications for Public Security and Forensics, 2007. SAFE '07. IEEE Workshop on; 05/2007
• Conference Proceeding: An Identity Based Single-Sign-On Scheme for Computer Networks

  Jian Ren
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  ABSTRACT: Conventionally, no user identification is required for a user to log into a security-protected system. User authentication is based on what the user knows, or what the user has, which can be easily shared among others. Moreover, when multiple systems are involved, the user is then required to authenticate to each system individually and repeatedly. In this paper, we present a scheme to achieve secure user identification and authentication to multiple security-protected systems simultaneously through a single operation. The proposed scheme is based on the well-known RSA cryptosystem, the discrete logarithm problem and the subset-sum NP-complete problem. Security analysis shows that the proposed scheme is secure to all known security attacks and can be easily implemented in various environments including very resource constrained environment such as Smart Cards.
  Signal Processing Applications for Public Security and Forensics, 2007. SAFE '07. IEEE Workshop on; 05/2007