最常用的凯撒
例abcdefghijklmnopqrstuvwxyz

凯撒1:bcdefghijklmnopqrstuvwxyza
凯撒2:cdefghijklmnopqrstuvwxyzab
凯撒3:defghijklmnopqrstuvwxyzabc
凯撒4:efghijklmnopqrstuvwxyzabcd
凯撒5:fghijklmnopqrstuvwxyzabcde
凯撒6:ghijklmnopqrstuvwxyzabcdef
凯撒7:hijklmnopqrstuvwxyzabcdefg
凯撒8:ijklmnopqrstuvwxyzabcdefgh
凯撒9:jklmnopqrstuvwxyzabcdefghi
凯撒10:klmnopqrstuvwxyzabcdefghij
凯撒11:lmnopqrstuvwxyzabcdefghijk
凯撒12:mnopqrstuvwxyzabcdefghijkl
凯撒13:nopqrstuvwxyzabcdefghijklm
凯撒14:opqrstuvwxyzabcdefghijklmn
凯撒15:pqrstuvwxyzabcdefghijklmno
凯撒16:qrstuvwxyzabcdefghijklmnop
凯撒17:rstuvwxyzabcdefghijklmnopq
凯撒18:stuvwxyzabcdefghijklmnopqr
凯撒19:tuvwxyzabcdefghijklmnopqrs
凯撒20:uvwxyzabcdefghijklmnopqrst
凯撒21:vwxyzabcdefghijklmnopqrstu
凯撒22:wxyzabcdefghijklmnopqrstuv
凯撒23:xyzabcdefghijklmnopqrstuvw
凯撒24:yzabcdefghijklmnopqrstuvwx
凯撒25:zabcdefghijklmnopqrstuvwxy

“恺撒密码”据传是古罗马恺撒大帝用来保护重要军情的加密系统。它是一种替代密码，通过将字母按顺序推后起3位起到加密作用，如将字母A换作字母D，将字母B换作字母E。据说恺撒是率先使用加密函的古代将领之一，因此这种加密方法被称为恺撒密码。