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ROT13 密码

使用 ROT13 或自定义凯撒密码旋转来编码和解码文本。ROT13 是自反的——应用两次即可得到原文。

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
N O P Q R S T U V W X Y Z A B C D E F G H I J K L M
About Caesar Cipher:
  • • ROT13: Shift by 13, self-reversing (encode = decode)
  • • Each letter is replaced by one that is N positions down the alphabet
  • • Non-alphabetic characters (numbers, symbols, spaces) are preserved
  • • Named after Julius Caesar who used it for secret correspondence
  • • Not secure for actual encryption - only for obfuscation/fun

ROT13 - 技术详情

ROT13 shifts each letter by 13 positions in the alphabet. Since there are 26 letters, applying ROT13 twice returns the original text. It was commonly used to hide spoilers in forums.

命令行替代方案

# Using tr command
echo 'Hello World' | tr 'A-Za-z' 'N-ZA-Mn-za-m'

# Using Python
python3 -c "import codecs; print(codecs.encode('Hello', 'rot_13'))"