Mod-10 / Mod-11 Check Digit Calculator
Computes and verifies Mod-10 (Luhn) and Mod-11 check digits for arbitrary numeric strings.
Related
/etc/passwd & shadow Parser
Parse and explain Unix passwd and shadow file lines field by field.
Crypto & Hash
ABA Routing Number Validator
Validate a US bank ABA/routing transit number using its mod-10 checksum.
Crypto & Hash
Adler-32 Checksum
Compute the Adler-32 checksum of text or a file, as used by zlib.
Crypto & Hash
AES Encrypt / Decrypt
Encrypt and decrypt text with AES-GCM using a passphrase, producing self-contained Base64 output with embedded salt and IV.
Crypto & Hash