Technical Papers

Blocking Software Reports

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©1996-2008 Peacefire

"Using steganography to circumvent network-level censorship
Draws on information theory. A protocol for getting around proxy servers and firewalls needs to use steganography as well as cryptography, in order for circumvention to be undetectable. Bits of information are very different from bits of data -- and if a circumvention technique results in too many bits of information being transmitted, it will be too easy to detect. Most current methods for getting around proxy servers do not take this into account. But we aim to design a lasting protocol for getting around network-level censorship, which can withstand this kind of analysis attack.

The Penetration of CYBERsitter'97
Codebreaker Eddy L O "Saruman" Jansson describes how he reverse-engineered CYBERsitter and decrypted the blocked-site lists.
The Reversal of Net Nanny
Saruman again, describing the internal workings of Net Nanny.