- CRYPTOCard Network Security - http://www.cryptocard.com/
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.
- Clearview Systems - http://www.clearview.co.uk/
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.
- JOTP Calculator - http://www.cs.umd.edu/users/harry/jotp/
A java applet OTP (S/Key) calculator. The applet downloads onto the client machine and calculates locally.
- SkeyCalc - http://www.orange-carb.org/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.
- PalmKey - http://palmkey.sourceforge.net/
OTP (S/Key) calculator for palm pilots. Site includes information about both source and binary distributions.
- OTPC 9000 - http://www.basun.net/software/otpc/
An OTP (S/Key) calculator for Nokia 9000 cellular phones. Includes S/Key information and resources.
- David Baldwin - http://tltsu.anu.edu.au/~dgb900/
Author of an Apple Newton OTP (S/Key) calculator. Site includes information about the author, and a link to his FTP site.
- DynaPass - http://www.dynapass.com/
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 - http://www.ietf.org/html.charters/otp-charter.html
Current specifications for the official internet standard (a continuation of the BellCore S/Key standard). Composition and membership information included.
- PyOTP - http://pyotp.sourceforge.net/
A simple Python library, currently under development, to generate OTP (S/Key) responses. RFC-2289 compliant. Includes links to development and release information.
- S/Key Introduction - http://www.surfnet.nl/innovatie/surf-ace/security/doc/skey.html
A technical description of the S/Key algorithm.
- pilOTP - http://astro.uchicago.edu/home/web/valdes/pilot/pilOTP/
OTP (S/Key) client for the Palm platform. Includes screen captures, and general information as well as software downloads.
- The S/KEY One-Time Password System - http://citeseer.ist.psu.edu/34338.html
Scholarly paper by Neil Haller on the original S/Key system. Links to many citations from the original paper.
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