片语
simple substitution cipher简单代替密码
Monoalphabetic substitution cipher单表代替密码
Shift Substitution Cipher移位代换密码
cipher monoalphabetic substitution空暗码
multi-substitution cipher[计]
polyalphabetic substitution cipher多表替代密码
polygram substitution cipher多字母替代密码
homophonic substitution cipher多名码代替密码