Stream ciphers with IV length less than 12 bytes MUST be deprecated. Namely, bf-cfb, chacha20, and salsa20.
Users SHOULD choose stream ciphers with IV length of 16 or more bytes.
Users are RECOMMENDED to use the new AEAD ciphers.
翻譯一下就是非ietf的bf-cfb, chacha20, and salsa20的iv長度不夠12位,不安全。
要選擇iv長度大於16位的
墻裂建議用AEAD