Acta Metallurgica Sinica(English letters) ›› 2007, Vol. 14 ›› Issue (2): 75-78.doi: 1005-8885 (2007) 02-0075-04

• Artificial Intelligence • 上一篇    下一篇

Secure mediated certificateless signature scheme

杨晨;马文平;王新梅   

  1. Xidian University
  • 收稿日期:2006-09-28 修回日期:1900-01-01 出版日期:2007-06-30

Secure mediated certificateless signature scheme

YANG Chen;MA Wen-ping;WANG Xin-mei   

  1. Xidian University
  • Received:2006-09-28 Revised:1900-01-01 Online:2007-06-30

摘要:

Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator (SEM) mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem (ECFP) assumption and bilinear computational diffie-hellman problem (BCDH) assumption is also proposed.

关键词:

certificateless; signature scheme; bilinear pairing; security mediator

Abstract:

Ju et al. proposed a certificateless signature scheme with instantaneous revocation by introducing security mediator (SEM) mechanism. This article presents a detailed cryptoanalysis of this scheme and shows that, in their proposed scheme, once a valid signature has been produced, the signer can recover his private key information and the instantaneous revocation property will be damaged. Furthermore, an improved mediated signature scheme, which can eliminate these disadvantages, is proposed, and security proof of the improved scheme under elliptic curve factorization problem (ECFP) assumption and bilinear computational diffie-hellman problem (BCDH) assumption is also proposed.

Key words:

certificateless;signature scheme; bilinear pairing;security mediator

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