SkeyCalc 2.0.1
by Colin Henein

An RFC-2289 compliant OTP response generator (S/Key Calculator) for the Mac.
Runs on Apple's Mac OS X, MacOS X Server, OPENSTEP and NEXTSTEP.

SkeyCalc computes one-time passwords for use in logging in to servers which implement OTP (sometimes called S/Key or SKey) access control. SkeyCalc supports both MD4 and MD5 based OTP algorithms.

SkeyCalc is not an arithmetic calculator like your pocket calculator.

SkeyCalc operates as a service, allowing for lightning-fast OTP authentication. It doesn't save your password in memory or on disk. SkeyCalc uses sensitive regular expressions to make using one-time passwords a snap.

Availability
 SkeyCalc for Macintosh is available to you at no cost. Fill out the form to the right of the screen to download a copy of SkeyCalc. The most recent version is SkeyCalc 2.0.1, available for Mac OS X version 10.0 and up.

Although I am not charging for SkeyCalc 2.0.1, the software is Postcard-Ware. This means that instead of paying for SkeyCalc, I only ask that you mail me a postcard. See the About SkeyCalc panel in the application for my address (which is correct). Why not check out the Gallery of cards I've already received?

About S/Key
 In today's internet world, computer security is serious business. Computers on the network need secure authentication mechanisms to protect access to people's data and correspondence. Traditionally this authentication is done by having the user identify themselves (by supplying a username) and then typing a password. One problem with this traditional authentication mechanism is that a malicious user on the internet can arrange to eavesdrop on the authentication. In order to solve this problem, one-time password systems were developed as an alternative to this traditional method of authenticating users. S/Key is an internet-standard one-time password system. A more detailed discussion is available in the SkeyCalc documentation.

History of SkeyCalc
 The SkeyCalc 2.0 series is for Apple's Mac OS X operating system. The most recent release is 2.0.1. A revision history with specific changes from version to version is available.

SkeyCalc has been around since April 1997, when it was originally released as an application for NEXTSTEP 3.3. Version 2.0 of SkeyCalc has been rewritten to support Apple's MacOS X platforms. (SkeyCalc 1.1 is still available for NEXTSTEP and OPENSTEP users, and has different license terms.)

SkeyCalc is the MacOS X equivalent of opie, opiecalc and skey+. Not on an SkeyCalc supported OS? Try: Win32 WinKey (Windows), OpieCalc (earlier MacOS), OPIE (source code). A great resource, especially away from home, is the JOTP Java Calculator.
Download SkeyCalc Now!
Please complete the following information to download SkeyCalc:
Version
  Mac OS X or
Mac OS X Server
10.0 and up
Rhapsody
Mac OS X Server (2.0 and under)
OPENSTEP
4.0-4.2
NEXTSTEP
Version 3.3
Contact
Name:
E-Mail:
It is highly recommended that you provide an email address so that I can notify you of security issues, bug fixes, and new versions. I will not spam you, or sell your address. Check this box if you want these notifications:
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Last modified: February 15, 2002

For those who are curious, I'm employed by Parliant Corporation,
but they have nothing to do with SkeyCalc.

Built for MacOS X