Passphrase alternatives
by Daniel Ramos for OpenKeychain (OpenPGP for Android)
Data security has become an important subject due to the increasing number of user data breaches. In order to increase the security and entropy for cases where there is an attempt at gaining access to user data, this proposal has a few suggestions on how to increase the security of OpenKeychain by presenting a number of security methods that the user can choose to protect his data from unauthorized access.