I understand this may not be the best place to ask a question like this, but I believe that this community may be the best/only place I can ask such a question.
I have inputs and outputs from an in-house hash developed years ago and the developer is no longer working with us any more. I need to determine the process that is the hash. Before you mention how this may be impossible, it appears to be a relatively simple hash and I have a few theories that appear to get me started in the right direction. First, the data:
Input Hash 1293239 EHELKHE 1331487 ILZXFZF 1320709 IKYJXWH 1328166 GUVUMMY 1156693 HFXLFYZ 1313273 ELHZLZV 1287367 GKDMWGM 1318623 EHDHYYF
This does not appear to be a very good hash, in my opinion. For starters, the output length matches the input length, this may be coincidence though. The main thing that catches my eye is that the output characters seem to all exist in a particular pool of possibilities. Here's a list of unique output characters: DEFGHIJKLMUVWXYZ. This lines up exactly with the hex values of 0123456789ABCDEF, in fact, in ASCII values, the two sets are 20 off from eachother. So I hypothesis:
D = 0 E = 1 F = 2 G = 3 H = 4 I = 5 J = 6 K = 7 L = 8 M = 9 U = A V = B W = C X = D Y = E Z = F
From there, I'm out of ideas. I've compared the hash results with many standard hashes and have seen no correlation and have determined that it is most likely an original process. I've played with the numbers as best as I can and I have made no progress. What techniques are available to analyze this hash?