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- SkeyCalc.app
- A Graphical S/Key Response Calculator for NEXTSTEP
- by Colin Henein <cmh@consecol.org>
-
-
- Current Release Summary
- -----------------------
- Version: 1.1
- Release: September 21, 1997
- Distribution Point: http://www.consecol.org:80/~cmh/SkeyCalc/
- Features: - Runs as a service, or as an application
- - Auto-selection of MD4 or MD5 based encryption based on input
- (Note: SHA is not supported in this release).
- - Does some very smart searching through input text looking for
- challenges so you can be sloppy about selecting more text
- than you need. Even works with select all in most cases!
- - Saves which encryption engine you like to use as a dwrite
- - Doesn't save your password, or do anything intelligent at all in
- this regard
-
- User Information
- ----------------
- SkeyCalc is now shareware software. Although, of course, version 1.0
- was free, I'd appreciate your being honourable and registering 1.1 if
- you really use the software, rather than continuing to run 1.0. Of
- course, if you don't have 1.0, you have no options. Regardless, if you
- use 1.1 for more than 30 days you must register. Registration fees are
- resonable, and academic users receive significant discounts.
-
- To use this program, install the package into your /LocalApps
- directory, or the Apps directory in your home directory. You can -- of
- course -- install it somewhere else, but it will not likely present
- itself as a service if you do.
-
- This program is usually launched as a service by selecting the
- challenge text in Terminal or Stuart or wherever, then selecting "SKey
- Response" from the services menu. If you select the otp-xxx portion of
- the challenge text, the program will select the correct encryption
- algorithm automatically. If you don't select the otp-xxx portion, you
- will need to select the engine manually, although the software will
- remember your preference for next time. Regardless, the challenge is
- automatically copied into the challenge portion of the window, and the
- cursor is positioned in the password field, ready for you to type your
- password. Since the <ENTER> key is the shortcut for the actual
- calculation, this is really quite fast. The correct response is
- calculated, then this response is "copied" automatically onto the
- clipboard. The calculator exits automatically, and you may then use
- the "paste" menu option (or hot key) to paste the response in the
- appropriate application.
-
- If you don't want to use the services menu, you may double-click the
- SkeyCalc.app program itself and either type the challenge into the
- challenge field, or copy and paste it. Then, type your password into
- the password field, optionally select an encryption engine, then press
- <ENTER> or click the "Calc & Copy" button.
-
- Intelligent searching
- ---------------------
- - SkeyCalc will search your input for valid challenges and discard any
- extraneous data, including newlines, and other text. This is
- particularly useful when running the program as a service. You can
- triple-click the challenge line, even if it contains other text, then
- select the services menu option. In fact, you can select whole screens
- of data, or be sloppy with the mouse and select a few lines. S/Key is
- a pain, so even these little details can make a calculator much easier
- to use.
-
- - Tip: You can even go as far as using the "select all" menu option to
- select all the text in your terminal buffer before pasting. Since
- SkeyCalc uses the last match, this even works if there is a previous
- challenge higher in the buffer. Of course, if there is a significant
- amount of data in the buffer SkeyCalc will take a bit more time to
- locate the pattern.
-
- Changes with 1.1 release
- ------------------------
- Auto-sense of encryption type added:
- SkeyCalc always required that the user manually select the
- encryption engine. Since RFC-1938 compliant challenges contain an
- "otp-xxx" selection phrase there didn't seem to be any good reason
- for this, except that I didn't write the code. This has now been
- fixed. SkeyCalc will remember the last algorithm that you manually
- select, but it will be temporarily overridden with the otp-xxx
- string from the input, if present. This makes us fully compliant
- with the RFC.
-
- Better searching for challenge strings:
- Previously SkeyCalc required the user to select only the challenge
- when forming the request. Now, it searches through its input for the
- last challenge matching the pattern "otp-xxx ### xxxxxxx", allowing
- the user to select any amount of text containing the query. If that
- pattern is not found, SkeyCalc will use the user's default encryption
- engine choice, together with the last occurence of the a string
- matching the "### xxxxxxx" pattern, which is popular for some servers
- who aren't strictly compliant with the RFC-1938 specification. This
- usually works even with selecting whole buffers of text with 'Select
- All', meaning that if you assign a shortcut for SkeyCalc, you have
- only to type cmd-a, cmd-?, your password, enter and cmd-v, thats 4
- keys, plus the length of your password. Not too shabby...
-
- Replace mode removed:
- It used to be that SkeyCalc offered two services, one to compute a
- challenge reponse and then put it into the pastebuffer (Copy
- Response), and the other to attempt to insert the response directly
- into the original application (Replace with Response). It was found
- that no useful applications allowed the Replace with Response
- service. Moreover, that feature was a big hack since NEXTSTEP really
- doesn't support interactive replacement services.
-
-
- SHA Encryption still not present:
- Ok, so this isn't a change. I just wanted to comment that the code for
- SkeyCalc has been entirely rewritten to facilitate my adding of other
- encryption systems, including SHA. I even have some SHA calculating
- code. Unfortunately this code seems to give different results on
- different platforms. I've decided not to delay the release of this
- version any further, but a version 1.2 supporting SHA encryption is in
- the works.
-
-
-
- Source Code, Disclaimer, License and Credits
- --------------------------------------------
- Source code to SkeyCalc is not available because it is copyrighted
- software. The encryption and S/Key calculation portions of the
- program, however, are contained in the OPIE library from NRL. Further
- copyright attribution and license information is located within the
- program under the "Registration..." menu item. I'm prepared to answer
- questions about the implementation, and am willing to discuss
- individual copies of source code for inspection purposes, although I'm
- not really keen on this.
-
-
- SkeyCalc and this document are copyright (C)1997 Colin Henein.
-