I think if we have a 32char string with limited alphabet we can code 32bit binary number in it. alphabet: [0123456789abcdefghijklmnopqrstuvwxyz] alternate:[ !" #$%&'()ABCDEFGHIJKLMNOPQRSTUVWXYZ] maximum 32bit unsigned number: 0xffffffff = 4294967295 => Sun, 07 Feb 2106 06:28:15 GMT input: 5f7a925bb0de0c40e328b93926840459 date: 01010111001101011111111101001000 (1463156552) output: 5F7A9"%Bb0DE0C4 E #"(B)#)2&84 459