ChaCha Cipher
Key
Nonce
Counter
Rounds
Input
Output
ChaCha is a stream cipher designed by Daniel J. Bernstein. It is a variant of the Salsa stream cipher. Several parameterizations exist; 'ChaCha' may refer to the original construction, or to the variant as described in RFC-8439. ChaCha is often used with Poly1305, in the ChaCha20-Poly1305 AEAD construction.
Options
Key: ChaCha uses a key of 16 or 32 bytes (128 or 256 bits).
Nonce: ChaCha uses a nonce of 8 or 12 bytes (64 or 96 bits).
Counter: ChaCha uses a counter of 4 or 8 bytes (32 or 64 bits); together, the nonce and counter must add up to 16 bytes. The counter starts at zero at the start of the keystream, and is incremented at every 64 bytes.
References
https://wikipedia.org/wiki/Salsa20#ChaCha_variant
Related Tools
LS47 Cipher
LS47 Cipher is a slight improvement of the ElsieFour cipher as described by Alan Kaminsky. It use 7x7 characters instead of original (barely fitting) 6x6, to be able to encrypt some structured information. It also describe a simple key-expansion algorithm, because remembering passwords is popular.
RC2 Cipher
RC2 (also known as ARC2) is a symmetric-key block cipher designed by Ron Rivest in 1987. 'RC' stands for 'Rivest Cipher'.
Characters Escape & Unescape
Characters Escape & Unescape can escapes special characters in a string so that they do not cause conflicts, and unescapes Characters in a string that have been escaped.
Unicode Characters Escape & Unescape
Unicode Characters Escape & Unescape can convert characters to their unicode-escaped notations, and convert unicode-escaped character notation back into raw characters.