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DDO-64 is a 64-bit Feistel-like block cipher based on data-dependent operations (DDOs). It is composed of 8 rounds and uses a 128-bit key. There are two versions of DDO-64, named DDO-64V 1 and DDO-64V 2 , according to the key schedule. They were designed under an attempt for improving the security and performance of DDP-based ciphers. In this paper, however, we show that like most...
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