Method in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. The method is named after Julius Caesar, who used it in his private correspondence.

How to decrypt a cipher text? To decrypt / decipher an encoded message, it is necessary to know the encryption used (or the encoding method, or the implemented cryptographic principle). Without …

Ciphertext is also known as encrypted or encoded information because it contains a form of the original plaintext that is unreadable by a human or computer without the proper cipher to decrypt it. This …

Select an algorithm below to encode or decode messages or learn more about the supported algorithms. Encode and decode text using common algorithms and substitution ciphers.

Detect cipher type instantly with our online cipher identifier and analyzer. Whether you’re working with Caesar, Vigenère, Atbash, or symbols from a number cipher code, this tool helps identify the cipher …

Discover the timeless Caesar cipher through our modern Caesar cipher translator. Named after Julius Caesar, who relied on it for secure military communications, this classic encryption technique shifts …

Whether you’re working with a simple cipher like ROT13 or a more complex one like Caesar or Atbash, this tool provides an easy way to encode or decode text using these popular methods. In this form, …

Jul 23, 2025 · Plaintext: The source or plain data or text that has to be converted into cipher text before sending it over a channel. Ciphertext: The coded message that cannot be comprehended in its …

Free online tools for encryption, encoding and hashing. Securely transform text with AES, Base64, SHA, and more - no registration required.

Ciphertext refers to plain text, which has been encrypted, whereas a key is a secret factor used in encrypting or decrypting information. It is this key that defines how plain texts are converted into cipher.