I have an iOS app that gives users a key which they need to save in some secure way (e.g. 1Password, LastPass, etc). This key is considered highly sensitive information. If the user copies the key to the clipboard to paste it into another app, is there a possibility that malicious background processes can access the clipboard while the key is copied? I tried looking this up and there doesn't seem to be much information about it.
Apps shouldn’t have access to the clipboard while in the background.
Coming back to your big picture, you should have a chat with the standard password vault vendors to see if they offer some mechanism to securely save a password to their vault. If such a thing did exist, it would let you bypass this copy’n’paste route entirely.
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