Need help with encrypted wallet.dat. I can't access it with my expected pass-phrase I created an offline wallet in 7/13 via a Ubuntu live CD. I recently imported the encrypted wallet.dat file into the bitcoin-qt wallet on Windows 7. Coins appeared. But, my expected passphrase is incorrect. At first I though I mis-recorded it or mis-typed it at inception. I have contacted a service to try to brute force it. However, I just went to restore and access my offline LTC wallet and same thing. Coins appear but passphrase is wrong. Same mistake twice seems pretty unlikely. Is there any other mistake I could have made that led to this? Please help me brainstorm.

Edit:
I think I figured out I may have done.

1. encrypted wallet 
2. copy wallet.dat 
3. change passphrase 
4. did not make new copy of `wallet.dat`


First encrypted copy would not decrypt with the new passphrase. Unfortunately, at that time I would not have grasped the consequence of resetting the passkey (ie re-encrypting the wallet.dat) and not creating a new backup of wallet.dat.

Edit 2: As a follow up it was a passphrase issue (mistyped twice at encryption). I was able to discover the actual passphrase by using the ruby script from this thread https://bitcointalk.org/index.php?topic=85495.

See my post # 312 for the details if you need help solving this kind of problem. The folks in that thread are very helpful.

Much thanks to all who helped. It was a stressful and frustrating experience - from which I learned a lot. :)
As a follow up I was able to discover the actual passphrase by using the ruby script from this thread https://bitcointalk.org/index.php?topic=85495.

See my post # 312 for the details if you need help solving this kind of problem. The folks in that thread are very helpful.

Much thanks to all who helped. It was a stressful and frustrating experience - from which I learned a lot. :)