{"doi":"10.1007/3-540-39200-9_34","conference":{"name":"EUROCRYPT: Theory and Applications of Cryptographic Techniques"},"author":[{"first_name":"Ueli","full_name":"Maurer, Ueli M","last_name":"Maurer"},{"full_name":"Krzysztof Pietrzak","first_name":"Krzysztof Z","orcid":"0000-0002-9139-1654","last_name":"Pietrzak","id":"3E04A7AA-F248-11E8-B48F-1D18A9856A87"}],"_id":"3210","alternative_title":["LNCS"],"title":"The security of many round Luby Rackoff pseudo random permutations","quality_controlled":0,"publication_status":"published","abstract":[{"text":"Luby and Rackoff showed how to construct a (super-)pseudo-random permutation {0,1}2n→ {0,1}2n from some number r of pseudo-random functions {0,1}n → {0,1}n. Their construction, motivated by DES, consists of a cascade of r Feistel permutations. A Feistel permutation 1for a pseudo-random function f is defined as (L, R) → (R,L ⊕ f (R)), where L and R are the left and right part of the input and ⊕ denotes bitwise XOR or, in this paper, any other group operation on {0,1}n. The only non-trivial step of the security proof consists of proving that the cascade of r Feistel permutations with independent uniform random functions {0,1}n → {0,1}n, denoted Ψ2nr is indistinguishable from a uniform random permutation {0,1}2n → {0,1}2n by any computationally unbounded adaptive distinguisher making at most O(2cn) combined chosen plaintext/ciphertext queries for any c &lt; α, where a is a security parameter. Luby and Rackoff proved α = 1/2 for r = 4. A natural problem, proposed by Pieprzyk is to improve on α for larger r. The best known result, α = 3/4 for r = 6, is due to Patarin. In this paper we prove a = 1 -O(1/r), i.e., the trivial upper bound α = 1 can be approached. The proof uses some new techniques that can be of independent interest. ","lang":"eng"}],"volume":2656,"publist_id":"3473","date_updated":"2021-01-12T07:41:49Z","type":"conference","extern":1,"intvolume":"      2656","page":"544 - 561","status":"public","publisher":"Springer","year":"2003","day":"04","date_published":"2003-06-04T00:00:00Z","citation":{"apa":"Maurer, U., &#38; Pietrzak, K. Z. (2003). The security of many round Luby Rackoff pseudo random permutations (Vol. 2656, pp. 544–561). Presented at the EUROCRYPT: Theory and Applications of Cryptographic Techniques, Springer. <a href=\"https://doi.org/10.1007/3-540-39200-9_34\">https://doi.org/10.1007/3-540-39200-9_34</a>","chicago":"Maurer, Ueli, and Krzysztof Z Pietrzak. “The Security of Many Round Luby Rackoff Pseudo Random Permutations,” 2656:544–61. Springer, 2003. <a href=\"https://doi.org/10.1007/3-540-39200-9_34\">https://doi.org/10.1007/3-540-39200-9_34</a>.","ista":"Maurer U, Pietrzak KZ. 2003. The security of many round Luby Rackoff pseudo random permutations. EUROCRYPT: Theory and Applications of Cryptographic Techniques, LNCS, vol. 2656, 544–561.","ieee":"U. Maurer and K. Z. Pietrzak, “The security of many round Luby Rackoff pseudo random permutations,” presented at the EUROCRYPT: Theory and Applications of Cryptographic Techniques, 2003, vol. 2656, pp. 544–561.","short":"U. Maurer, K.Z. Pietrzak, in:, Springer, 2003, pp. 544–561.","mla":"Maurer, Ueli, and Krzysztof Z. Pietrzak. <i>The Security of Many Round Luby Rackoff Pseudo Random Permutations</i>. Vol. 2656, Springer, 2003, pp. 544–61, doi:<a href=\"https://doi.org/10.1007/3-540-39200-9_34\">10.1007/3-540-39200-9_34</a>.","ama":"Maurer U, Pietrzak KZ. The security of many round Luby Rackoff pseudo random permutations. In: Vol 2656. Springer; 2003:544-561. doi:<a href=\"https://doi.org/10.1007/3-540-39200-9_34\">10.1007/3-540-39200-9_34</a>"},"date_created":"2018-12-11T12:02:02Z","month":"06"}