AES-256-GCM Coinbase backup

[ob1]

Thank you for your response. The encryption type is known and published. We have the encrypted string and password, I suppose the padding (which certainly does not change) is the 'unknown' needed to get to a starting point. If it can be decrypted then we can figure out what parts of the BIP39 wordlist are being stored. There is a lot of $ to be made here.