Encrypt Secret Text in Your Browser: How AES-256 Differs from Old Ciphers Like Caesar

The word encryption is used for things that are quite different. Some protect data for real; others are puzzles or mere format changes. Knowing which is which helps you choose.

The real thing

• AES-256 with a password: the data is locked with a key derived from the password (PBKDF2 with SHA-256, 600,000 rounds and a random salt). With a strong password it is secure; if you forget it, there is no recovery.
• RSA: a public and private key pair, for when sender and receiver have never shared a password.

Classic ciphers: fun, not secure

Caesar, Vigenère, Playfair and Morse are old schemes a computer breaks easily. Use them for learning or puzzles, not to protect real data.

Base64 and Hex are not secrecy

They only change how characters are written, and anyone can convert them back at once. SHA is a hash function, used to check whether data changed, not an encryption you can reverse.

Layering

Press Add layer to stack several methods; when decrypting, the order is reversed for you. Everything runs in your browser with no upload.