Applied Cryptography and Network Security: Third by Jonathan Katz, Philip MacKenzie, Gelareh Taban (auth.), John

By Jonathan Katz, Philip MacKenzie, Gelareh Taban (auth.), John Ioannidis, Angelos Keromytis, Moti Yung (eds.)

The third foreign convention on utilized Cryptography and community safety (ACNS 2005) used to be backed and arranged via ICISA (the foreign Commu- cations and knowledge safety Association). It was once held at Columbia collage in big apple, united states, June 7–10, 2005. This convention complaints quantity comprises papers offered within the academic/research music. ACNS covers lots of learn components which were gaining value in recent times as a result of the improvement of the net, instant communique and the elevated international publicity of computing assets. The papers during this quantity are consultant of the cutting-edge in safety and cryptography examine, all over the world. this system Committee of the convention obtained a complete of 158 submissions from around the globe, of which 35 submissions have been chosen for presentation on the a- demic tune. as well as this music, the convention additionally hosted a technical/ commercial/ brief papers song whose shows have been additionally rigorously chosen from one of the submissions. All submissions have been reviewed through specialists within the correct areas.

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Communications of the ACM, 22(11):594–597, Nov 1979. 22. B. Pinkas and T. Sander. Securing passwords against dictionary attacks. In the 9th ACM conference on Computer and communications security, 2002. 23. R. L. Rivest, A. Shamir, and D. A. Wagner. Time-lock puzzles and timed-release crypto. Technical Report LCS/TR-684, MIT, 1996. 24. E. Spafford. Observing reusable password choices. In the 3rd UNIX Security Symposium, 1992. 25. Transport Layer Security Working Group. 0 specification. http://wp. com/eng/ssl3/.

Instead of sending k1 to Bob, she sends kp = h(k1 , z ). Bob computes k1 and kp = h(k1 , z). He proceeds only if kp is equal to kp . To keep the protocol to be 4-pass, Bob computes sk before sending out the 4th message. Finally, he sends cookienew and the lifetime of cookienew in the 4th message. Assume the output of h(·) is random. t. z = z and h(z , Y, IPc ) = h(z, Y, IPc ) is 2N1−n . Since n N , with 24 Peng Wang et al. Client (C) Server (S) enter C, π x ∈R Z∗ q C, X −−−−−−−−−−−−→ X = f1 (x) k1 = f3 (C, S, x, Y, π) z =h −1 (puzzle, Y, IPc ) Y, puzzle, n ←−−−−−−−−−−−−− − kp −−−−−−−−−−−→ kp = h(k1 , z ) k2 = f5 (C, S, x, Y, π) k2 , cookienew , l abort if k2 = k2 compute sk generate ticketnew save cookienew and ticketnew ←−−−−−−−−−−−−−−− lookup client’s verifier v y ∈R Z∗ q Y = f2 (C, S, X, y, v) z ∈R Z2n puzzle = h(z, Y, IPc ) k1 = f4 (C, S, X, y, v) kp = h(k1 , z) abort if kp = kp compute sk generate cookienew k2 = f6 (C, S, X, y, v) Fig.

The usability of the system is not sacrificed. Client-side cookies. In our approach, cookies are stored in users’ computers. Once the client receives a new cookie (after successful login), the client can simply delete the stale cookies for that account; therefore, the maximum number of cookie stored on a user’s computer is equal to the the number of accounts the user has. If cookies are stored in the server, then the server has to store all cookies that have not expired. If the authentication service is heavily used and if the lifetime of cookies is long, then the server has to store a large number of cookies.

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