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Files from Chris Chrysler

Email addresschryslercodeworks at gmail.com
First Active2011-02-03
Last Active2011-02-03
SimpleSPA Single Packet Authorization Tool
Posted Feb 3, 2011
Authored by Chris Chrysler | Site sourceforge.net

SimpleSPA is an application that consists of a single packet authorization mechanism designed for the purpose of hiding semi-public services like a SSH server. There is a server side (Linux only) and a client side (Windows and Linux). This application is similar to FWKnop and more of an academic/proof of concept application as opposed to a full blown commercial quality application. involves a client that creates a packet with a payload encrypted with the public half of two different RSA keys. The idea is that one key would be shared by all users and it would encrypt the user name of the individual. A second key specific to each individual user would encrypt a pre-shared key (just any old string, nothing secret about it really) and a timestamp (to counter replay attacks). The server would receive this packet and decrypt this first half of the packet, which would give us the user name of the person sending the packet. The server would then know which user specific second key to use to decrypt the pre-shared key and time stamp to evaluate them for acceptability. If all is good, then the server would open up a port for the semi-public service we were trying to conceal for a brief amount of time to allow for a connection to be made. PDF included that explains everything. Written in Java.

tags | tool, java, scanner, proof of concept
systems | linux, windows, unix
SHA-256 | 378f5402ded74b2de9cd170f0b9807fe64089a1ec6ed3df52cbfb01b705fce3d
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