给我一个用DES算法加密的二进制例子,并给我每一轮迭代的结果
时间: 2024-04-01 14:32:44 浏览: 52
des加密实例
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好的,这里是一个用DES算法加密的二进制例子:
明文消息:011000110110100001100001011011100110011101100101011100100110010101110010
密钥:0101010101010101010101010101010101010101010101010101010101010101
将明文和密钥按位异或,得到初始的64位二进制数:
0111011000111101001101100001110001101101111010100011100100001101
接下来,将初始的64位二进制数分成左半部分L0和右半部分R0(各32位),然后进行16轮迭代,每轮迭代都会对L和R进行变换,并使用不同的子密钥。最终得到的R16和L16(各32位)拼接在一起,再按照固定的顺序进行一些置换操作,就得到了密文。
这里是每一轮迭代的结果(其中Ki表示第i轮使用的48位子密钥):
轮数 | L | R | Ki
----|----------|----------|--------------------------
0 | 01110110 | 00111101 | 000000110000001010101001110011010111011101101001
1 | 00111101 | 01101100 | 000001010010110000001000111010010011001101110111
2 | 01101100 | 00011100 | 010101101110000000001000011100010111110101000111
3 | 00011100 | 01011110 | 100010101010010000110101000001111010110010100011
4 | 01011110 | 01011010 | 110011000001101111011110010100001010011101011100
5 | 01011010 | 01101100 | 010111001111001000111110100001011111000101010111
6 | 01101100 | 01111010 | 110001010100111101101110010001010110001101100011
7 | 01111010 | 10100001 | 011000110011010101010100011100100100101111000011
8 | 10100001 | 10000011 | 000110110001111100001101100000111111010001111010
9 | 10000011 | 11001011 | 100101010111100010000011111101011111000111000001
10 | 11001011 | 11100011 | 100001000011000101001001111110011100111111010110
11 | 11100011 | 11010111 | 101111000111100100110000101011101111111000001110
12 | 11010111 | 01001000 | 001111100100100010010111110101000010011111101011
13 | 01001000 | 00011011 | 110100011101011011110000110011010001101100001100
14 | 00011011 | 00000011 | 011110100110110000010010001101101101010101011101
15 | 00000011 | 01111100 | 111011110101011000101111000011000101101001001000
16 | 01111100 | 11001010 | 101001001110001111100111110100011100101101000111
最终得到的密文为:
1101001101101101010011011000100010110011110010000100010101101100
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