Q: Itunes asks for me to unlock my iphone passcode when I want to backup to my computer without encryption.  I entered my itunes password and my iphone passcode but neither works.  What password are they looking for?

Hello nativegirl1836,

Thanks for using Apple Support Communities.

If I understand your post correctly, you are not being prompted for a password when using an encrypted back up, but you are being prompted to enter a password when you disable the encrypted backup.  Is this correct?

Whenever you try and disable the encrypted backup, you will be prompted for the password you gave initially.  See below for more information:

How can I turn off iTunes backup encryption?

To turn off iTunes backup encryption, enter the password and uncheck the Encrypted backup box in iTunes. Your encryption password is always required to turn off backup encryption.

You can't use an encrypted backup if you don't have the password. If you forgot your password, the only way to turn off backup encryption on your device is to erase your device and set up as new. Erasing removes all data from your device. If you don't want to erase your device, restore from an iCloud backup instead.

About encrypted backups in iTunes

Take care.