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Password authentication is very critical for secure access to computing systems/servers as it verifies the identity of users and processes. Most authentication systems use some form Positive Identification (PI) to identify legitimate users. Specifically, these systems use a password profile containing all the user passwords that are authorized to access the system (or the server). The negative counterpart (non-self/anti-password space) represents strings that are not in the password file (which can possibly be exploited by hackers using password guessing or cracking tools). The paper describes a biologically-inspired authentication technique which is based on the negative (anti-password) concept.
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