The whatUseek Directory - One_Time

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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.

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.

David Baldwin - Author of an Apple Newton OTP (S/Key) calculator. Site includes information about the author, and a link to his FTP site.

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.

OTP/Skey - One Time Password Information - Good list of OTP (S/Key) calculators for normal and unusual platforms. Description of S/Key tools usage on unix systems.

OTPC 9000 - An OTP (S/Key) calculator for Nokia 9000 cellular phones. Includes S/Key information and resources.

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.

PalmKey - OTP (S/Key) calculator for palm pilots. Site includes information about both source and binary distributions.

PyOTP - A simple Python library, currently under development, to generate OTP (S/Key) responses. RFC-2289 compliant. Includes links to development and release information.

RFC 2289 - A One-Time Password System. N. Haller, C. Metz, P. Nesser, et al. February 1998.

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.

Vulnerabilities in S/KEY - A good discussion of those problems that OTP schemes can't solve. Applicable to many OTP schemes, not just S/Key.

otpCalc - An OTP (S/Key) calculator for X (X-Windows). Supports MD4, MD5, SHA1, and RIPEMD-160 message digests. Site includes screenshots.

pilOTP - OTP (S/Key) client for the Palm platform. Includes screen captures, and general information as well as software downloads.

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