Comments (4)
jannson
commented on July 30, 2024
chacha20
chacha20-ietf 加密的支持？不知道效果如果，会不会计算得更快？
还有，加密方式能否自己进行选择？
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xtaci
commented on July 30, 2024
@jannson 现在大多数设备的cpu都应该支持aes-ni指令，AES加密有硬件支持的情况下，不一定慢。
- RC4的加密在数据包层面固定偏移位置能直接xor推导出特征,弃用。
- DES的加密没有硬件支持，太慢。
- chacha20如果是rc4这种stream cipher,对于包级别依然无法去特征。
(比如包头部偏移32个字节就可以猜测kcp头部，xor做实验，验证下一个包的kcp)。
总之，在包级别去特征，只能用block cipher
在传输层，可以自己在上面实现一层TLS就能保证数据的安全，这一层才能选择chacha20/rc4/des这些，类似于-tuncrypt选项。
我非常支持你做任意的修改，有任何问题我可以提供详细的解释，一起探讨。
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jannson
commented on July 30, 2024
原来如此。明白了~
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riobard
commented on July 30, 2024
Salsa20/ChaCha20 用随机 nonce 就可以去特征了。详见 https://nacl.cr.yp.to/secretbox.html
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