Encrypt with shift 3
text = HELLOshift = 3mode = encrypt
Result: KHOOR
Caesar Cipher Demo
EDUCATIONAL DEMONSTRATION ONLY - Not for production security. The Caesar cipher shifts each letter by a fixed number of positions in the alphabet. It was used by Julius Caesar and is trivially breakable with 25 possible shifts.
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Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Is the Caesar cipher secure?
No. It has only 25 possible shifts, making it trivially breakable by brute force. Even frequency analysis can break it instantly.
Why study it?
The Caesar cipher illustrates the fundamental concepts of substitution ciphers, key spaces, and why modern cryptography uses much larger key spaces and more complex transformations.
What is the difference between cipher and code?
A cipher transforms text character-by-character (substitution or transposition). A code replaces entire words or phrases. The Caesar cipher is a substitution cipher.
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