Learn Classical Cryptography
Explore Caesar, Atbash, and Vigenère ciphers to understand the history and principles of cryptography.
Shifts each letter by 13. Self-inverse — applying it twice returns the original.
Education tips
These classical ciphers form the foundation of modern cryptography. Atbash (Hebrew) dates to ~500 BCE; Caesar to ~50 BCE; Vigenère to the 16th century.
Caesar and Atbash are monoalphabetic — each letter always maps to the same output. Vigenère is polyalphabetic — the same letter maps to different outputs depending on position.
The Vigenère cipher was called "le chiffre indéchiffrable" (the indecipherable cipher) for centuries until Charles Babbage cracked it in 1854.
Try encoding the same message with all four ciphers and compare. The Vigenère output looks most random because the key varies — this demonstrates why key length matters.
사용 방법
왜 저희 도구인가요?
Also check out…
Encode and Decode ROT13
Use ROT13 to obscure text — the go-to cipher for s
Create Caesar Cipher Puzzles
Encode hidden messages in Caesar cipher for scaven
Send Secret Messages
Encode personal messages, notes, and private commu
Apply the Atbash Cipher
Reverse the alphabet with Atbash: A becomes Z, B b