Japan My Number

Based >Extensible Algorithm Framework

The Japan My Number algorithm is a built-in instance of the Checkdigit framework.

This algorithm masks input in the standard format of the 'My Number' personal identifier.

The characteristics of the input numbers are:

• 12 digits long

• checkdigit as the last digit

• checkdigit calculated using the IBM MOD11 formula

• no non-numeric characters

The algorithm instance will take an input of valid 'My Number' and return valid masked equivalent with new digits and a valid calculated checkdigit. Digits from the input, not including the original checkdigit are masked, and then a new checkdigit is derived and replaces the original one.

Input that does not meet the expected format will masked using a fallback instance of the CM Alpha-Numeric algorithm.

Examples:

Valid input:

• “641717601551“ → "270722285678"

• "389419154673" → "268290512983"

Invalid Input:

• “111-222-333“ → “895-912-671“

• "1234567890abcdefghij" → "1244102233iquxbsahjx"

• null → null

• ““ → ““