암호 도구

The Caesar cipher is one of the oldest encryption techniques, named after Julius Caesar. It works by shifting each letter in the alphabet by a fixed number of positions. For example, with a shift of 3, "A" becomes "D", "B" becomes "E", and so on.

ROT13 is a special case of the Caesar cipher with a fixed shift of 13. It is its own inverse — applying ROT13 twice returns the original text. It was historically used in online forums to hide spoilers or puzzle solutions.

Atbash is a substitution cipher that maps each letter to its reverse in the alphabet: A↔Z, B↔Y, C↔X, and so on. It originated in Hebrew cryptography and is also its own inverse.

Base64 is technically an encoding scheme, not a cipher or encryption. It converts binary data into ASCII text using 64 printable characters. It provides no security — anyone can decode it — but it is useful for safely transmitting data in text-only channels.

No. Caesar, ROT13, Atbash, and reverse text are all trivially easy to break and should never be used for securing sensitive information. They are educational, recreational, or suitable only for situations where security is not a concern.

No. All encoding and decoding happens entirely in your browser. Your text is never sent to any server or stored anywhere. You can verify this by using the tool offline or inspecting the page source.

Yes. Once the page is loaded, all cipher operations are performed locally in your browser. No internet connection is required after the initial page load.

Encoding transforms data into a different format for transmission or storage (like Base64), while encryption transforms data to keep it secret from unauthorized parties. Encoding is reversible by anyone who knows the scheme; encryption requires a key.