network security term project (2002 fall)
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
Network Security
Term Project(2002 Fall)
발표자 : 최철준학 번 : 20022153
Class : Network SecurityProfessor : Kwang-jo Kim
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
Topic :Forward Secrecy and It’s Application
Subject : Forward Secrecy in Proxy Signature
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
Table of Contents
1. Introduction
2. Main subject of this project
- What is Proxy Signature? - What is Forward Secrecy
3. Conclusion
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
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
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
What is Proxy Signature (cont..)
Security Requirements
1. Verifiability
2. Strong unforgeability
3. Strong Indentifiability
4. Strong Undeniability
5. Prevention of Misuse
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
• [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
Related Work
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
Schnorr-based Proxy Signature
Original Signer’s Parameter
Verification
Proxy Signer
kxrreqhs
gr
Zk
AAAA
kA
qR
),(
*
AAA srreq ,,
Arreqh
As ryg AAA ),(
?
BArreqh
Ax
P
BAP
yrygy
xsxAAP ),(
KeyGeneration
Referenced by Byong cheon Lee Lecture note
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
Schnorr-based Proxy Signature
),(),,,,(
mxSrbidIDreqIDm
PP
ABBAA
),,,( pyqpPublicKey
),,,,,( PABBAA rbidIDreqID
}{
),,(
),,,,(
?
?
),(
AB
PP
ABBAA
BArreqh
AP
reqbid
truemyV
rbidIDreqIDmyryy AA
Proxy Signer
Verifier
)( pxSigningKey
Referenced by Byong cheon Lee Lecture note
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
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.]
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
• 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.
Related Work
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
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.
Network Security Term Project 2002 Fall
Network Security Chul Joon Choi
2002. 10.08
Prof. Kwang jo Kim
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