1 / 12

Network Security Term Project (2002 Fall)

Network Security Term Project (2002 Fall). 발표자 : 최철준 학 번 : 20022153. Class : Network Security Professor : Kwang-jo Kim. Topic : Forward Secrecy and It’s Application. Subject : Forward Secrecy in Proxy Signature. Table of Contents. Introduction Main subject of this project

tucker-trevino
Download Presentation

Network Security Term Project (2002 Fall)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Network Security Term Project (2002 Fall) 발표자 : 최철준 학 번 : 20022153 Class : Network Security Professor : Kwang-jo Kim

  2. Topic : Forward Secrecy and It’s Application Subject : Forward Secrecy in Proxy Signature

  3. Table of Contents • Introduction • Main subject of this project - What is Proxy Signature? - What is Forward Secrecy 3. Conclusion

  4. What is Proxy Signature • Proxy Signature scheme • - Delegation of signing capability • : An original signer delegates her signing capability to a proxy signer • - Proxy signing • : The proxy signer creates a proxy signature on behalf of the original signer Referenced by Byong cheon Lee Lecture note

  5. What is Proxy Signature (cont..) • Security Requirements 1. Verifiability 2. Strong unforgeability 3. Strong Indentifiability 4. Strong Undeniability 5. Prevention of Misuse

  6. Related Work • [BC93] B.C Neuman, “Proxy-based authorization and accounting for distributed systems.” Proc 13th International Conference on Distributed Computing Systems (1993) 283-291 • [MUO96] M. Mambo, K. Usuda, E.Okamoto, “Proxy Signature: Delegation of the Power to Sign Messages”, IEICE Trans. Fundamentals, E79-A:9(1996) 1338-1353 • [KPW97] S.Kim , S.Park, and D.Won , “Proxy Signature, revisited”, Proc of International Conference on Information and Communication Security (1997) 223-232. • [LKK01A] B. Lee, H.Kim, K.Kim, “Strong Proxy signature and its Applications.” Proc of SCIS (2001) 603-608. • [LKK01B] B. Lee, H.Kim, K.Kim, “Secure Mobile Agent using Strong Non-designated Proxy Signature.” Australasian Conference on Information Security and Privacy (2001) 474-486

  7. Schnorr-based Proxy Signature Original Signer’s Parameter Proxy Signer Verification Key Generation Referenced by Byong cheon Lee Lecture note

  8. Schnorr-based Proxy Signature Proxy Signer Verifier Referenced by Byong cheon Lee Lecture note

  9. What is Forward Secrecy • Definition of Forward Secrecy • - Forward Secrecy • : Compromise of the current secret key does not enable an adversary to forge signatures pertaining to the past • [Bellare et. al.]

  10. Related Work • Ross Anderson, “Two Remarks on Public Key Cryptology.” Invited lecture, CCCS ’97. • M. Bellare and S. Miner, “A Forward-Secure Digital Signature Scheme.” Crypto ’99. • J. Katz, “A Forward-Secure Public-Key Encryption Scheme.” Crypto 02’ rump session. • U. M .Maurer, Y. Yacobi, “A Non-interactive Public-Key Distribution.” Designs, Codes and Cryptography v9, no 3 pp 305-316.

  11. Relationship b/w Proxy Signature and Forward secrecy • People are not concerned about key destroying in Proxy signature. • The key revocation and escrow problem is also important issue in proxy signature. • Some researchers worried about forgery of original signer but it is also possible that proxy signer can recreate forged proxy signature after the key was revoked.

  12. Conclusion and Future Work • Survey the Proxy Signature and Forward Secrecy • Bring up the Problem in Proxy Signature • - Key revocation problem & proxy signer’s forgery • How to merge between Proxy Signature and Forward Secrecy

More Related