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basE91 is an advanced method for encoding binary data as ASCII characters. It is similar to UUencode or base64, but is more efficient. The overhead produced by basE91 depends on the input data. It amounts at most to 23% and can range down to 14%.
A verification library accompanied by a simple tool for verification of credit-cards, social security-numbers and other mod(10) and similar checksums in a standard shell-environment from the command-line or as a function. No compilation required.