Decryption algorithms on the rows and the possible key

The main thing - to understand why there is a hash and the integrity of what they're trying to save.

the web app? and I do not think that just the Board id <-> hash, which file is searched and no direct relationship may not be?

Similar to MD5. Try using Rainbow Tables Evernote it. Only to download it will be a LOT ;-)

try to sort out the standard algorithms hash functions: md5 (like not good — too long hash), sha1, sha256, etc. But most likely nothing will come of it ;)

For long times like MD5 :-)

hmm... IMHO, the author gave very little input, but still...
\r
"There are 4 different lines..." — is likely to be encrypted is not directly related to "id=28185".
For example, a certain service, the user wants to download a file with id=28185. As an option:
1. does the md5 of time() + pid of the process + anything-else
2. these IDs and md5 is written to the plate with say two columns fileid and md5hash
3. after some inquiry, which involves 326c7310add8008334bfb212f5e7caeb of this plate is an unusual id, something is done (e.g. given some information to the user) and recording hits
\r
In this situation, what you want to get the output? That was encrypted using md5? so there is certainly a set of unnecessary data. The connection between md5 and id? So it may not be at all...