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New Efficient User Identification and Key Distribution Scheme Providing Enhanced Security

New Efficient User Identification and Key Distribution Scheme Providing Enhanced Security. Authors: Y. Yang, S. Wang, F. Bao, J. Wang, and R. H. Deng Source: Computers & Security, Vol. 23, No. 2, pp 697-704, 2004 Speaker: Cheng-Chi Lee. 1. Wu-Hsu Scheme.

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New Efficient User Identification and Key Distribution Scheme Providing Enhanced Security

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  1. New Efficient User Identification and Key Distribution Scheme Providing Enhanced Security Authors: Y. Yang, S. Wang, F. Bao, J. Wang, and R. H. Deng Source: Computers & Security, Vol. 23, No. 2, pp 697-704, 2004 Speaker: Cheng-Chi Lee 1

  2. Wu-Hsu Scheme • Their scheme consists of two phases: • Key Generation • Anonymous User Identification 2

  3. Wu-Hsu Scheme (cont.) • Key Generation SCPC (Smart Card Producing Center) Ui N=pq ed=1 mod (p-1)(q-1) Public: N, e, g, f Secret: d, p, q f: hash function Secure channel Si=IDid mod N Keep Si Computes Si for user or service provider 3

  4. Wu-Hsu Scheme (cont.) • Anonymous User Identification Pj Ui (1) Service request (2) z=gkSj mod N (3) z (4) a=ze/IDj x=Sif(at||T) y=get Note: k and t are random number, and Kij is a session key. (5) (x, y, T) Kij=atx=ykx=gektx (6) Check T and verify IDi =? (x/f(yk||T))e 4

  5. Attack on Wu-Hsu Scheme • Anonymous User Identification Pj Ui (1) Service request (2) z=gkSj mod N (3) z (4) a=ze/IDj x=Sif(at||T) y=get (5) (x, y, T) Kij=atx=ykx=gektx (6) Check T and verify IDi =? (x/f(yk||T))e x/f(yk||T)=Si 5

  6. Yang et al. Scheme • Their scheme consists of two phases: • Key Generation: it is the same as Wu-Hsu scheme. • Anonymous User Identification 6

  7. Yang et al. Scheme (cont.) • Anonymous User Identification Pj Ui (1) Service request (2) z=gkSj-1 mod N (4) a=zeIDj Kij=at x=get s=gtSif(x,T) y=EKij(IDi) Note: k and t are random number, and Kij is a session key. (3) z (5) (x, s, y, T) Kij=at=xk=gket (6) IDi=DKij(IDi) xIDif(x,T) =? se 7

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