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c#.netencryptionyahoo-messenger

What encryption generates this type of text?

I'm trying to decode a DAT file produced by Yahoo Messenger, which looks similar to the text below which I generated by opening an exe in Notepad:

‹
‹N€9 tè…ÀtäÿFöt‹FŠ ‹V‹NˆÿFÿNëÿFH‰F3À9Ft9Ft  ö…³   ;Øtsj÷ël;Øt%‹F‹N¶Dÿj Pÿ5@aÐMè5  …À„þÿÿ…Ûuƒ} tÇEø   jEPÿvÿvÿuøÿ5DaÐMÿÐM…Àu,ÿÐM=Y  tjðë…ÛtjöXë<3Àf‹F,ÇF.   ‰Eë‹E‹N…Étÿv2PÿÑëƒ~$ t
‹N(f‰ƒF(ÿF 3À‰F_[É ÌÌÌÌ̃ù
u<r<Ÿ

I have tried few online tools that has various encryption algorithm like Blow-fish, DES, MD5 1-Way and other normal encryption like leet speak, rot-13 etc, but i found the generated text is normal readable but not the original one. I think its AES or RSA or Triple DES. Actually i am working on a utility that will read the Yahoo Messengers archive of the local. But when i open the local , I found a DAT file, with encrypted text as above.

(UPDATE)

As per venkyduded article "yahoo uses a simple XOR algorithm to encode the messages (so much for security !!) ". Any good link on XOR rversing.

Any help would be highly appreciated.

Solution

  • Yahoo Messenger only encodes the data files. Take a look at http://www.venkydude.com/articles/yarchive.htm for details on the format of the data.