I am working on a version of Password Safe for Android. Password Safe uses a passphrase to encrypt your passwords, but writing long code phrases on your smartphone can be tedious, especially if they are disguised. I would like to explore the use of alternatives to a passphrase, such as arrays of simple images.
Are there any good examples of such password methods? Which images are better? Zener Cards seem like a good choice, but don't seem to lend themselves to mnemonic devices, of course, not for the number of values you need to get a strong passphrase.
EDIT: Some commandments may help. Password security is that a file containing passwords is encrypted with a strong key that is never saved. On the PC, this strong key is the cryptographic hash of the phrase or word that you enter when you want to unlock the safe. The safe automatically “forgets” the password that you provided to it and deletes all unencrypted versions of the data after X minutes so that you are not vulnerable.
Ideally, I would like to see a version of a secure password that can be decrypted with one of two equally strong keys, with one of the keys suitable for an alphanumeric keyboard, and the other an answer to a question.
So far, the best idea that I came up with is to let the user enter a phrase for which a rebus can be created, and the resulting record based on the image is the resulting input method.
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