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.
David Baldwin
Author of an Apple Newton OTP (S/Key) calculator. Site includes information about the author, and a link to his FTP site.
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.
One Time Passwords In Everything (OPIE)
OTP (S/Key) source code, oriented towards unix servers. Provides calculator tools, as well as server FTP, login and su programs. Freely redistributable. Site includes user-contributed software.
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. Site includes 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.
SkeyCalc
OTP (S/Key) calculator for MacOS X, MacOS X Server and NEXTSTEP. RFC-2289 compliant. Site includes software downloads, documentation and an introduction to the technology.
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.