Decryption help needed!

Nexy · 5 Mar 2007 at 16:26

I've got a challenge/appeal for you! I'm hoping someone with some cryptographic skill (or mad crypto skillz) can help me. I'm trying to read my Napster log file, because their support is ******* useless. The log file looks like this:

Code:

%sAAAAAgAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSp/+SFatevLwfmdIlaO56z6JYWwtCtparWmqKZp4AR1497Q2MvvefwCnmBxgpOg2jZjs2vGebn5GLIa71cSiFKMMC0iKT98h2Dq6rElvxmPjY4gYNrId2EPCEqJuXjU1RmxxQ6n2u4A09fQGT09ZWAl5ogwCLYjoVr
%twAAAAEAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSp/+SFatevLwfmdIlaO56z6JYWwtCtparWmqKZp4AR1497Q2MvvefwCnmBxgpOg2jZjs2vGebn5GLIa71cSiFKMMC0iKT98h2DjmyPBpNlJBU4gYNrId2EPCEqJuXjU1RmxxQ6n2u4A08i0x0tWoyRHT/FCG6VN61B
%sQAAAAcAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSpR0VeEBLmDIZUgTAAsrTCdDK5s+q+2qNLyGu9XEohSjD0997XNqVL877+J5qyV9gGS7lQt3osbeOZCAEGb2ztLL6uvZkoIbzHKqiSq54NSrlDkUPT4YSuIYjNz+BT2EZqPenLNKMtfrEbtQ8/Vrfwrr1UPuB2Clou
%5wAAAAEAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSpR0VeEBLmDIZUgTAAsrTCdDK5s+q+2qNLyGu9XEohSjBR8OTkZP1O/77+J5qyV9gGS7lQt3osbeNGCpxVJtHHV3yiQhR/ZBj6YgslMPPhMW1R6/couw7quLaQ9DC+qibHkXEDvq4ejJlJwzPlu0UF8eU70VBzyeAcFNS/0Tp2EvSXWXj6DaZ2RlmFjMbPzUUcxorA3lRZhnF/SKTigBlelr4P60M18dG9
%pwAAAAEAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSp/uN2sNNnehNcHNFN+A2KjVSBMACytMJ0VimurLWlbUF9kNt5rtG50b7+J5qyV9gGS7lQt3osbeNGCpxVJtHHV3abBBsS3BxAw5WpJpsKefP8JNItA6SghFHr9yi7Duq4kJPtXQssM4Y=
%7QAAAAMAAACIWNUwYZLA/19j8TckVsd1L8ffdPP/WLctYD1soiMkvqGQdmw53PxJMpu1tZ/qGoTSeZV6WAGwd3NTyA/6ZXSp/uN2sNNnehNcHNFN+A2KjVSBMACytMJ0VimurLWlbUE1hcqVzYYAbb7+J5qyV9gGS7lQt3osbeOZCAEGb2ztLMwfjqyZHj0+dq1BSbzwK/zq4ixTt1u1l3NTyA/6ZXSpao49fmKczk1XjXc9v3OTggaL7xKyB4S1Z4gV4t3yPY/W21JmYhuqDcMATvsLSYkxdFpFOUeHXgEGI7fI76cTfjPXlmZMqvkoXL8D6uSwAYU=

Unfortunately, cryptography isn't my strong point. I'm not trying to pirate anything (I am basically renting the music from them, which is a model that works well for me), so I don't think this is going against any forum rules, and I don't think it belongs in WOS. I just want to be able to read the log file so I can try and work around the issues myself (there are some tracks it just won't download and the Help people aren't helping). Normally if a company did this, I'd switch, but it's pretty much this or iTunes for me. Any ideas guys? It doesn't seem to be ROT-13 so I'm stumped...

Inquisitor · 5 Mar 2007 at 16:33

Why would it be encrypted? Are you sure it's not just raw binary data?

Una · 5 Mar 2007 at 16:36

It looks like some base64 encoded hash possibly...

Could you post the log somewhere in its original format?

Inquisitor · 5 Mar 2007 at 16:43

Una said:
It looks like some base64 encoded hash possibly...

I was thinking that, but it doesn't seem to be valid base64.

edit: nevermind, yes it is.

The first line, at least, is valid if you take the % off the front.

Nexy · 5 Mar 2007 at 17:10

I've dropped the log file and the .db file, which I presume is the music database, in the same folder here:
http://www.willderrick.co.uk/db30.zip
It might contain my username and/or password, who knows? If you decrypt it and they are in there, please don't buy any music, but my rental thing means you can listen and download any. Not that I'm endorsing such a thing!

EDIT: You said that it's valid Base64, when I tried using a javascript Base64 decoder, it was just a single odd charactor. How did you work it out? Or am i being dense?

Una · 5 Mar 2007 at 17:16

You need to remove the % off the front as Inquisitor says... however its still looks like junk after.

Nexy · 6 Mar 2007 at 09:38

Thanks guys, I guess that means I'm a couple of steps closer. Any ideas where else I could post this for some free geeky assistance? Or anyone suggest the next steps I should take in my fun-filled adventure?