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On the generic and efficient constructions of secure designated confirmer signatures

Journal Article


Abstract


  • "For controlling the public verifiability of ordinary digital signatures, designated confirmer signature (DCS) schemes were introduced by Chaum at Eurocrypt 1994. In such schemes, a signature can be verified only with the help of a semi-trusted third party, called the designated confirmer. The confirmer can further selectively convert individual designated confirmer signatures into ordinary signatures so that anybody can check their validity. In the last decade, a number of DCS schemes have been proposed. However, most of those schemes are either inefficient or insecure. At Asiacrypt 2005, Gentry, Molnar and Ramzan presented a generic transformation to convert any signature scheme into a DCS scheme, and proved the scheme is secure in their security model. Their DCS scheme not only has efficient instantiations but also gets rid of both random oracles and general zero-knowledge proofs. In this paper, we first show that their DCS transformation does not meet the desired security requirements by identifying two security flaws. Then, we point out the reasons that cause those flaws and further propose a secure improvement to fix the flaws. Finally, we present a new generic and efficient DCS scheme without using any public key encryption and prove its security. To the best of our knowledge, this is the first secure DCS scheme that does not require public key encryption."

Authors


  •   Wang, Guilin (external author)
  •   Baek, Joonsang
  •   Wong, Duncan S. (external author)
  •   bao, Feng (external author)

Publication Date


  • 2007

Citation


  • Wang, G., Baek, J., Wong, D. S. & Bao, F. (2007). On the generic and efficient constructions of secure designated confirmer signatures. Lecture Notes in Computer Science, 4450 43-60.

Scopus Eid


  • 2-s2.0-38049078711

Ro Metadata Url


  • http://ro.uow.edu.au/infopapers/3710

Has Global Citation Frequency


Number Of Pages


  • 17

Start Page


  • 43

End Page


  • 60

Volume


  • 4450

Abstract


  • "For controlling the public verifiability of ordinary digital signatures, designated confirmer signature (DCS) schemes were introduced by Chaum at Eurocrypt 1994. In such schemes, a signature can be verified only with the help of a semi-trusted third party, called the designated confirmer. The confirmer can further selectively convert individual designated confirmer signatures into ordinary signatures so that anybody can check their validity. In the last decade, a number of DCS schemes have been proposed. However, most of those schemes are either inefficient or insecure. At Asiacrypt 2005, Gentry, Molnar and Ramzan presented a generic transformation to convert any signature scheme into a DCS scheme, and proved the scheme is secure in their security model. Their DCS scheme not only has efficient instantiations but also gets rid of both random oracles and general zero-knowledge proofs. In this paper, we first show that their DCS transformation does not meet the desired security requirements by identifying two security flaws. Then, we point out the reasons that cause those flaws and further propose a secure improvement to fix the flaws. Finally, we present a new generic and efficient DCS scheme without using any public key encryption and prove its security. To the best of our knowledge, this is the first secure DCS scheme that does not require public key encryption."

Authors


  •   Wang, Guilin (external author)
  •   Baek, Joonsang
  •   Wong, Duncan S. (external author)
  •   bao, Feng (external author)

Publication Date


  • 2007

Citation


  • Wang, G., Baek, J., Wong, D. S. & Bao, F. (2007). On the generic and efficient constructions of secure designated confirmer signatures. Lecture Notes in Computer Science, 4450 43-60.

Scopus Eid


  • 2-s2.0-38049078711

Ro Metadata Url


  • http://ro.uow.edu.au/infopapers/3710

Has Global Citation Frequency


Number Of Pages


  • 17

Start Page


  • 43

End Page


  • 60

Volume


  • 4450