[Cryptography] Newbie cryptoanalysis question

[Carlos P]

Hello,

 
I am auditing some code that I think that is crap and I have to demonstrate it without access to it, it is black box testing.

The data is something like this and I have ten rows

Variable  Variable TS                   Signature
ID1       ID2                              


3242424   34      2015-10-31 23:59:59   a1a2b3A4A
3242425   34      2015-10-31 23:59:59   123456Aab
3242426   34      2015-10-31 23:59:59   abcdefABC

I bet on that Signature is a function of ID1, ID2 and TS without any additional secret.


I think that there is a process that could help me deduce that function. Could some one hint me some keywords?

Thank you


Carlos Pantelides
@dev4sec
seguridad-agile.blogspot.com