Encrypted iPhone Backup isn't accepting the right password

See Disable iOS backup encryption - Apple Community. In particular:

If you have forgotten the password, or were not aware that encryption had been enabled, consider that it might be any computer, Apple ID, Wi-Fi password or device PIN that you've used in the past, working from the assumption that you might have reused a common password that you were using when encryption was first activated. See About encrypted backups on your iPhone, iPad, or iPod touch - Apple Support for details.

tt2

I can only presume at some point the value stored on the device has been corrupted somehow, changing the value subsequently used to encode and decode the backup. I would recommend backing up to iCloud and then using the steps to remove backup encryption being added to future backups.

tt2

iamspeedkachow wrote:

A while ago i tried to backup my iphone to my mac but couldn’t do it because my mac didn’t have enough space but i had already set a password, then i backed it up to my windows computer through itunes and set the same password.

Saturday i backed my iphone to the same windows pc and tried to restore from backup and it said wrong password so i backed it up to someone else’s mac and even though i didn’t set a password this time it was encrypted, i clicked restore from backup and entered the old password, it accepted the password started the process but my phone got erased and went to the hello screen.

I learned that it accepts any password but if the password is wrong it just erases the phone without a warning.

I lost a lot of important data and i’ve been trying a lot of ways to find the right password.

I looked to the keychain access and found nothing, i looked to the keychain access at my mac and found the same password ive been trying, i tried every password i have ever used.

So what is the password now?

I didn't set it, the other mac's owner never backed up an iPhone with encryption before so he didn't set it, it isn't in the keychain access , where did this password come from?

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good question—

Never had such an issue.

it seems confounding this backup being passed around on so many machines. I would not remain optimistic here.

iPhone backups can be found here from the Finder>Go>Go To Folder, copy & paste:

~/Library/Application Support/MobileSync/Backup

or the GUI

further—

Call Customer Support (800) MY–APPLE (800–692–7753)

or on line https://getsupport.apple.com/

or call AppleCare Support at 1-800-APLCARE (800-275-2273)

Outside the USA—Contact Apple for support and service by phone

See a list of Apple phone numbers around the world.

Contact Apple Support - Apple Support 

Not as far as I know.

tt2