Feistel cipher is a design model designed to create different block ciphers, such as DES. The model uses substitution and permutation alternately. This cipher structure is based on the Shannon model ...
考察和练习 Hack Assembly 编程。三个 parts 层层递进，最终实现 4 轮的 Feistel 加密算法。 Part A: 实现 XOR 运算，RAM[5] = RAM[3] XOR RAM[4]。关键点在于将 XOR 转换成 Hack 汇编所支持的运算 Part B: 实现将 RAM[3 ...
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