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Check digits (or characters) are a 'checksum' on a number or word to help prevent manual typing errors. This was originally based from Cryptography for Internet and Database Applications, pp 221-229. This projects provides examples and source in both java and javacript. Check digits (or characters) are a 'checksum' on a number or word to help prevent manual typing errors. They are not used for long or binary data sets. They are not hashes, nor cryptographic. They do not do error correction. They