AltSci Blog

MD5 Collision Parser

jvoss@altsci.com
jvoss@myuw.net
Nov 17, 2005

MD5 Collision Parser 0.1 Source [sig]
MD5 Collision Data Example [sig]
MD5 Collision Generation Homepage

This program parses the output of an MD5 Collision Generation program. It creates two binaries with the same md5sum. Hopefully this will allow people to put MD5 into a deep grave with a dozen nails in the coffin.

I went for quick and dirty. This python program is not secure. In fact, a person should not use this until after looking at both the source and the data. The program uses an eval() call on the data.

Network Mapping

jvoss@altsci.com
jvoss@myuw.net
Nov 11-13, 2005

NetMap2 0.2.2 Source [sig]
NetMap1 0.2.1 Source [sig]

Netmap1 Neg9 Talk
Netmap2 Neg9 Talk
Netmap2 Neg9 Project

The Network Mapping project (also known as Neg9 UW Network Project) plans to develop tools to report on the usage of public networks through active scanning of ports. The first two tools are known as netmap1. It uses Nmap to discover available hosts and discover open ports on the hosts. Netmap1 involves two tools that can be run as part of a script. parse_ping1.py and parse_port1.py are run by the script scan_full1.sh. The output of the script are a set of xml files and records in a MySQL database.

Network Mapping

jvoss@altsci.com
jvoss@myuw.net
Nov 11-13, 2005

NetMap2 0.2.2 Source [sig]
NetMap1 0.2.1 Source [sig]

Netmap1 Neg9 Talk
Netmap2 Neg9 Talk
Netmap2 Neg9 Project
BitTorrent Attack

The Network Mapping project (also known as Neg9 UW Network Project) plans to develop tools to report on the usage of public networks through active scanning of ports. The first two tools are known as netmap1. It uses Nmap to discover available hosts and discover open ports on the hosts. Netmap1 involves two tools that can be run as part of a script. parse_ping1.py and parse_port1.py are run by the script scan_full1.sh. The output of the script are a set of xml files and records in a MySQL database.

Oct 5, 2006

Text steganography 1 version 0.1.1 [sig]
Rubber Spoon 1 version 0.1 [sig]
libsteg version 0.4.4 [sig]

Steganography is the science of hiding information in plain sight. It does not require cryptography, but in modern computation, it is obvious that cryptography is quite likely to be involved. There are a handful of methods of steganography that are well-known but most of them involve taking the least significant bits (lsb) of a large set of data and flipping it to a pattern. Keying the flipping of bits makes for a larger attack surface, but can still be brute forced if the key lacks enough entropy.

It is important that the input picture used for steganography not be available to an attacker because this will allow the attacker to see ~90% of which bits are flipped giving away the secret and plausible deniability. Image generation that is impossible to reverse is a topic that can be discussed in the future. An easy way that would give away intent would be to flip all non-steg least significant bits randomly. A better way would be to design the algorithm around the randomness already present in images.