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) was once subsidized and arranged via ICISA (the overseas Commu- cations and data protection Association). It was once held at Columbia college in manhattan, united states, June 7–10, 2005. This convention complaints quantity includes papers offered within the academic/research music. ACNS covers loads of examine components which have been gaining value in recent times because of the improvement of the net, instant communique and the elevated worldwide publicity of computing assets. The papers during this quantity are consultant of the state-of-the-art in defense and cryptography learn, around the world. this system Committee of the convention acquired 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 song, the convention additionally hosted a technical/ commercial/ brief papers tune whose shows have been additionally conscientiously chosen from one of the submissions. All submissions have been reviewed by way of specialists within the proper areas.
Read or Download Applied Cryptography and Network Security: Third International Conference, ACNS 2005, New York, NY, USA, June 7-10, 2005. Proceedings PDF
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Extra info for Applied Cryptography and Network Security: Third International Conference, ACNS 2005, New York, NY, USA, June 7-10, 2005. Proceedings
Creating a puzzle that requires one random number generation and one hash computation is inexpensive. The server can adjust the cost of solving the puzzle by simply tuning n. Even if the client knows Y and IPc , due to the one-way property of the cryptographic hash function h(·), the client has no eﬃcient way to solve the puzzle than trying diﬀerent numbers z ∈ Z2n until puzzle = h(z , Y, IPc ). We denote h−1 (·) as the procedure used to solve the puzzle. On average, it takes 2n−1 trials to solve this puzzle.
With SPAKA+, Eve can still disconnect earlier. However, she cannot verify her guesses without solving puzzles. The amount of work Eve can save is one message per guess. The cost of sending one message is several magnitudes lower than the cost of solving a puzzle. Hence, Eve’s cost of running online dictionary attacks and her cost of running many-to-many attacks 28 Peng Wang et al. Client (C) Server (S) enter C, π x ∈R Z∗ q X = f1 (x, π) find ticket and cookie abort if ticket is expired find a in the ticket k1 = f3 (C, S, x, Y, π) kp = h(k1 , a) abort if kp = kp k2 = f5 (C, S, x, Y, π) C, X, cookie −−−−−−−−−−−−−−− → Y, kp , cookienew , l ←−−−−−−−−−−−−−−− kq kq = h(k2 , a) compute sk generate ticketnew save cookienew and ticketnew −−−−−−→ abort if the cookie is invalid find a in the cookie lookup client’s verifier v y ∈R Z∗ q Y = f2 (C, S, X, y, v) k1 = f4 (C, S, X, y, v) kp = h(k1 , a ) compute sk generate cookienew k2 = f6 (C, S, X, y, v) kq = h(k2 , a ) abort if kq = kq Fig.
As in the 3-pass without cookie case, we use kp and kq instead of k1 and k2 . Again, Bob sends cookienew and l in the second message. 26 Peng Wang et al. Client (C) Server (S) enter C, π x ∈R Z∗ q C, X −−−−−−−−−→ X = f1 (x, π) k1 = f3 (C, S, x, Y, π) abort if k1 = k1 k2 = f5 (C, S, x, Y, π) compute sk Y, k1 ←−−−−−−−−− k2 −−−−−−−−−−→ lookup client’s verifier v y ∈R Z∗ q Y = f2 (C, S, X, y, v) k1 = f4 (C, S, X, y, v) k2 = f6 (C, S, X, y, v) abort if k2 = k2 compute sk Fig. 4. General 3-pass protocol.