The process involves 16 rounds and can run in four different modes, encrypting blocks individually or making each cipher block dependent on all the previous blocks.
这个过程包括16轮，可以运行在四种不同的模式，加密模块单独或使每个密文块依赖所有前面的块。
Because this behavior can be used to crack a cipher, cipher modes are introduced that modify the encryption process based on feedback from earlier block encryptions.
因为这种行为可以用来破解密码，因此采用了密码模式，它会依据先前区块加密回馈来修改加密程序。
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