Caesar Cipher
NewThe Caesar cipher is one of the oldest and simplest encryption techniques, used by Julius Caesar for confidential military communications. It shifts every letter in the plaintext by a fixed number of positions in the alphabet. While not secure for modern use, it is a foundational concept in cryptography education and is used in CTF challenges. Supports all shift values from 1 to 25 for both encryption and decryption.
Caesar Cipher
Classic ROT cipher — shifts each letter by a fixed amount. Educational tool demonstrating historical encryption.
Caesar cipher provides no real security. It is for educational purposes only.
How to Use Caesar Cipher
- 1Enter the plaintext to encrypt
- 2Set the shift value (1–25)
- 3View the encrypted ciphertext
- 4Use the same shift to decrypt
About Caesar Cipher
The Caesar cipher is one of the oldest and simplest encryption techniques, used by Julius Caesar for confidential military communications. It shifts every letter in the plaintext by a fixed number of positions in the alphabet. While not secure for modern use, it is a foundational concept in cryptography education and is used in CTF challenges. Supports all shift values from 1 to 25 for both encryption and decryption.
Your Privacy is Protected
Caesar Cipher runs entirely in your browser. Your files and data are never uploaded to any server, never stored, and never shared. Everything happens locally on your device using secure browser APIs.
Frequently Asked Questions
Is the Caesar cipher secure?
No. It only has 25 possible keys, making it trivially breakable by brute force or frequency analysis. Use AES-256 for real encryption.
What is ROT13?
ROT13 is a special case of the Caesar cipher with a shift of 13. Because 13+13=26 (alphabet size), ROT13 is its own inverse.
Why Use This Tool?
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