Luby-Rackoff Ciphers from Weak Round Functions?

The Feistel-network is a popular structure underlying many block-ciphers where the cipher is constructed from many simpler rounds, each defined by some function which is derived from the secret key. Luby and Rackoff showed that the three-round Feistel-network

• Type: Conference
• Year: 2006
• Where: EUROCRYPT
• Authors: Ueli M. Maurer, Yvonne Anne Oswald, Krzysztof Pietrzak, Johan Sjödin
• Keywords: CPA Secure Pseudorandom, Cryptology, EUROCRYPT 2006, Pseudorandom Function, Secure Pseudorandom Permutation