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"The OTPW package consists of the one-time-password generator
otpw-gen plus two verification routines
otpw_prepare() and
otpw_verify() that can easily be added to programs such as
login or
ftpd on POSIX systems. For platforms that support the Pluggable Authentication Method (PAM) interface, a suitable wrapper is included as well. Login software extended this way will allow reasonably secure user authentication over insecure network lines. The user carries a password list on paper. The scheme is designed to be robust against theft of the paper list and race-for-the-last-letter attacks. Cryptographic hash values of the one-time passwords are stored for verification in the user’s home directory."
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