Security of Feistel Schemes with New and Various Tools.
Rodolphe Lampe, Jacques Patarin · 2012
Abstract: We combine the H Coe cients technique and the Coupling technique to improve security bounds of balanced Feistel schemes. For q queries and round functions of n−bits to n−bits, we nd that the CCA Security of 4 + 2r rounds Feistel schemes is upperbounded by