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S/KEY is a one-time password system developed for Unix-like operating systems. Under S/Key, each user is given a list of passwords to be used in authentication. As each password in the list is only used once, passwords intercepted by a password sniffer or keyboard logger are not useful to an attacker. S/Key is supported in Linux via Pluggable authentication modules, OpenBSD, NetBSD, and FreeBSD.
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