Abstract: Technologies relating to converting an alphanumerical string that comprises personally identifying data (PID) into a signature for the string are described herein. The string is partitioned into several substrings, where each substring includes at least one character. For each substring, a sequence of bits that is uniquely mapped to the substring is retrieved from a mapping table. Thereafter, at least one bit is removed from each sequence of bits to create updated sequences of bits, and the updated sequences of bits are ordered based upon their values. For each updated sequence of bits, a substring that is uniquely mapped to the updated sequence of bits is retrieved from the mapping table. The retrieved substrings are concatenated in the order corresponding to the updated sequence of bits.