I developed an authentication algorithm for user authentication as part of my masters thesis and implemented it in PHP. I intend to know how can I implement the algorithm for operating system login, in which language (for linux)? also where the code will reside because it will not be click and run code it will automatically load upon the starting of OS. Thank you and I hope no down vote in haste.
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Answer
PAM is the Pluggable Authentication Modules used in Linux. There is extensive documentation on writing new modules.