Adaptive data obfuscation

A system comprising:

• a memory;
• and
• a processor configured to:
• select a first string of a first portion of input plain text that does not match a predefined text signature from a set of two or more text signatures stored in the memory;
• identify a historical string that is similar to the first string from a set of two or more historical strings stored in the memory;
• generate a first text signature by updating a text signature in the set of two or more text signatures that matches the identified historical string, wherein the first text signature defines a pattern that matches the first string and the identified historical string;
• and
• save the first text signature to the set of text signatures in the memory.

A computer program product for obfuscating a string, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, wherein the computer readable storage medium is not a transitory system per se, the program instructions executable by a processor to cause the device to perform a method comprising:

• selecting, by the processor, a first string of a first portion of input plain text that does not match a predefined text signature from a set of two or more text signatures stored in a memory;
• identifying, by the processor, a historical string that is similar to the first string from a set of two or more historical strings stored in the memory;
• generating a first text signature, by the processor, by updating a text signature in the set of two or more text signatures that matches the identified historical string, wherein the first text signature defines a pattern that matches the first string and the identified historical string;
• and
• saving the first text signature, by the processor, to the set of text signatures in the memory.