please dont rip this site

Using the SXBLITZ-protocol with a SX-Key instead of a SXBLITZ

When the owner of a SX-Key likes to approach this unit with his own written software, the SX-Key appears only willing to communicate with encrypted bytes. Fortunately the securety protocol is very simple. You'll need only a few extra instructions.

During initalisation the "real SX-Key" sends two random bytes (in the string wich contains <SX-Key>) to generate the initial transportkey's for the rest of the session. After each transmitted or received byte you have to generate a new pair of key's. (see the scheme).

In the description of the SXBLITZ-protocol the two bytes are fixed: <#37><#95>. Generation of the initial key's from a SXBLITZ always will give 'zero' as outcome for both (also during the rest of the session).

Not described in the document "SXBLITZ Communication Protocol" (In case of programming a real SX-Key): Before sending the words FUSEX and FUSE, send <#02><#32> (of course encrypted!!)

Maarten Mulders [M.J.Mulders at 12move.nl]

 

Example using good old BASIC

GenKey: 'generate new pair of transportkey's

HELP = (((Key1 XOR Key2) * 64) XOR (Key1 XOR Key2)) AND &H80

Key2 = ((Key1 AND 1) + (Key2 * 2)) AND &HFF

Key1 = (HELP + INT(Key1 / 2)) AND &HFF: RETURN

Decrypt: DecryptByte = (Key1 - (InByte XOR Key2)) AND &HFF: GOSUB GenKey:
RETURN

Encrypt: GOSUB GenKey: EncryptByte = (Key1 XOR (OutByte - Key2)) AND &HFF:
RETURN

InitKey: Key1 = Input1 XOR &H37: Key2 = Input2 XOR &H95: RETURN

See also:


file: /Techref/parallax/sxkey/SXBLITX_SXKEY.htm, 2KB, , updated: 2004/10/5 13:21, local time: 2024/11/10 09:53,
TOP NEW HELP FIND: 
34.204.176.71:LOG IN
©2024 PLEASE DON'T RIP! THIS SITE CLOSES OCT 28, 2024 SO LONG AND THANKS FOR ALL THE FISH!

 ©2024 These pages are served without commercial sponsorship. (No popup ads, etc...).Bandwidth abuse increases hosting cost forcing sponsorship or shutdown. This server aggressively defends against automated copying for any reason including offline viewing, duplication, etc... Please respect this requirement and DO NOT RIP THIS SITE. Questions?
Please DO link to this page! Digg it! / MAKE!

<A HREF="http://techref.massmind.org/techref/parallax/sxkey/SXBLITX_SXKEY.htm"> HREF="../sxkey.htm"otocol with a SX-Key instead of a SXBLITZ</A>

After you find an appropriate page, you are invited to your to this massmind site! (posts will be visible only to you before review) Just type a nice message (short messages are blocked as spam) in the box and press the Post button. (HTML welcomed, but not the <A tag: Instead, use the link box to link to another page. A tutorial is available Members can login to post directly, become page editors, and be credited for their posts.


Link? Put it here: 
if you want a response, please enter your email address: 
Attn spammers: All posts are reviewed before being made visible to anyone other than the poster.
Did you find what you needed?

 

Welcome to massmind.org!

 

Welcome to techref.massmind.org!

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  .