https://github.com/rykerwilder/rot13-encryption

ROT13 encryption script.
https://github.com/rykerwilder/rot13-encryption

decryption encryption encryption-decryption rot13

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ROT13 encryption script.

• Host: GitHub
• URL: https://github.com/rykerwilder/rot13-encryption
• Owner: RykerWilder
• Created: 2025-04-01T17:54:23.000Z (7 months ago)
• Default Branch: main
• Last Pushed: 2025-04-01T18:48:47.000Z (7 months ago)
• Last Synced: 2025-04-01T18:50:55.371Z (7 months ago)
• Topics: decryption, encryption, encryption-decryption, rot13
• Language: Python
• Homepage:
• Size: 0 Bytes
• Stars: 0
• Watchers: 1
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

          
# ROT13 Encryption

ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet.

---

1. **str.maketrans** creates a translation table to replace characters in a string.

2. **The first argument** is the list of original characters: all lowercase followed by all uppercase ('abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ').

3. **The second argument** is the list of replacement characters:

    - For lowercase (string.ascii_lowercase):

    string.ascii_lowercase[13:] takes the letters from the 13th position onwards ('nopqrstuvwxyz').

    string.ascii_lowercase[:13] takes the first 13 letters ('abcdefghijklm').

    Concatenating them gives: 'nopqrstuvwxyzabcdefghijklm' (ROT13 for lowercase).

    - For uppercase (string.ascii_uppercase):

    Same logic: string.ascii_uppercase[13:] ('NOPQRSTUVWXYZ') + string.ascii_uppercase[:13] ('ABCDEFGHIJKLM') → 'NOPQRSTUVWXYZABCDEFGHIJKLM' (ROT13 for uppercase).

---

```python

# Encryption

message = "Hello World!"

encrypted = rot13(message)

print(encrypted) # Output: "Pvnb Zbaqb!"

# Decryption (same function)

decrypted = rot13(encrypted)

print(decrypted) # Output: "Hello World!"

```

To see how rot13 encryption works see here [ROT13 Encryption](https://github.com/RykerWilder/notes/blob/main/ROT-13.md).