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Clearview Systems - Suppliers of Secure Computing SafeWord, a scheme based on hardware tokens. Includes rationale for single-use password systems, as well as other network security products.
CRYPTOCard Network Security - Password tokens delivered on key fobs, palm pilots, hardware or software. Security for dial in, access control, internet and web connections. Offers a strong two factor system. Management software. Includes rationale and business case for token-based access.
DynaPass - Provides primary or secondary authentication by regularly distributing passwords (or parts of passwords) through wireless phones. Time locked access.
IETF One Time Password Authentication Charter - Current specifications for the official internet standard (a continuation of the BellCore S/Key standard). Composition and membership information included.
JOTP Calculator - A java applet OTP (S/Key) calculator. The applet downloads onto the client machine and calculates locally.
OTPC 9000 - An OTP (S/Key) calculator for Nokia 9000 cellular phones. Includes S/Key information and resources.
otpCalc - An OTP and S/Key calculator for X - otpCalc is an RFC2289 and RFC1760 compliant one time password calculator, written to use the GTK+ library for screen I/O.
PalmKey - OTP (S/Key) calculator for palm pilots. Information about both source and binary distributions.
pilOTP - OTP (S/Key) client for the Palm platform. Includes screen captures, and general information as well as software downloads.
PyOTP - A simple Python library, currently under development, to generate OTP (S/Key) responses. RFC-2289 compliant. Includes links to development and release information.
RFC2289 - A One-Time Password System - The current internet standard, as descended from the original S/Key specification.
S/Key Introduction - A technical description of the S/Key algorithm.
The S/KEY One-Time Password System - Scholarly paper by Neil Haller on the original S/Key system. Links to many citations from the original paper.
SkeyCalc - OTP (S/Key) calculator for MacOS X, MacOS X Server and NEXTSTEP. RFC-2289 compliant. Software downloads, documentation and an introduction to the technology.