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项目作者： orbarilan4

项目描述 ：
Implementation of CBC decryption using only ECB decryption
高级语言： Python
项目地址: git://github.com/orbarilan4/cbc-decryption.git
创建时间： 2020-06-30T17:23:11Z
项目社区：https://github.com/orbarilan4/cbc-decryption
开源协议：
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CBC Decryption

Contains two main things:

  • cbc_custom_decrypt(key, n, cipher) function is implementation of CBC decryption by using only ECB decryption.
  • Suppose that bit number j of block ci of the ciphertext got flipped (namely, if
    the original value of the bit was 0 then it changed to 1, and if the original value
    of the bit was 1 then it changed to 0). The decryption
    process will decrypt all blocks correctly, except for blocks i and i + 1. The
    decryption of block i will be completely random, and the decryption of block
    i + 1 will be correct, except for bit j in this block that will be flipped. cbc_flip_fix(key, n, cipher) function gets the original value of the block whose encryption was completely corrupted (by definition)