1 research outputs found
Quantum Distinguishing Attacks against Type-1 Generalized Feistel Ciphers
A generalized Feistel cipher is one of the methods to construct block ciphers, and it has several variants. Dong, Li, and Wang showed quantum distinguishing attacks against the -round Type-1 generalized Feistel cipher with quantum chosen-plaintext attacks, where , and they also showed key recovery attacks [Dong, Li, Wang. Sci China Inf Sci, 2019, 62(2): 022501].
In this paper, we show a polynomial time quantum distinguishing attack against the -round version, i.e., we improve the number of rounds by . We also show a quantum distinguishing attack against the -round version in the quantum chosen-ciphertext setting. We apply these quantum distinguishing attacks to obtain key recovery attacks against Type-1 generalized Feistel ciphers