how i can find used algorithm

[pln]

Hi, 
I have a problem and did not know how to resolve it.
I have the encryption tool, so i can generate a file containing for example "secret".
I do not know the encryption algorithm.

How knowing the word "secret" and being sure of its existence in the file, find the algorithm (one of the standard one)

Maciek

[atom]

You need to reverse engineer the binary to find out