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90321011 孫國偉

Efficient Password authenticated key agreement using smart cards Author : Wen-Shenq Juang* Date : 2003.11.26 in Computers & Security. 90321011 孫國偉. Introduction:. What is the smart card What does it must to have merits Review Chien et al.s(2002) Our protocol Security analysis.

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90321011 孫國偉

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  1. Efficient Password authenticatedkey agreement using smart cards Author : Wen-Shenq Juang* Date : 2003.11.26 in Computers & Security 90321011 孫國偉

  2. Introduction: • What is the smart card • What does it must to have merits • Review Chien et al.s(2002) • Our protocol • Security analysis

  3. What is smart card

  4. Main merits: No verification table: ID1 PW1 ID2 PW2 ID3 PW3 . . . User Server

  5. Main merits: Freely chosen password: Users can feely choose Their own passwords

  6. Main merits: Lower communication and computation cost: They may not provide a powerful computation capability and high bandwidth

  7. Main merits: Mutual authentication: Users and servers can authenticate each other

  8. Review Chien et al.s(2002) • The registration phase • The login phase • The verification phase

  9. The registration phase ID = identity PW= password x = server’s secret key Smart Card Server User

  10. The login phase T = current timestamp Card Reader Smart Card Server

  11. The verification phase Reject Server User

  12. The drawbacks • Time-synchronization problem user’s time and server’s time must differ only in small range • No provide key agreement

  13. Our protocol • Registration phase • Login and session key agreement phase

  14. The registration phase ID = identity PW= password x = server’s secret key Smart Card Server User

  15. Login and session key agreement phase

  16. Security analysis

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