MD5 To Be Considered Harmful Someday

Item

Title
MD5 To Be Considered Harmful Someday
Description
Joux and Wang’s multicollision attack has yielded collisions for several one-way hash algorithms. Of these, MD5 is the most problematic due to its heavy deployment, but there exists a perception that the flaws identified have no applied implications. We show that the appendability of Merkle-Damgard allows us to add any payload to the proof-of-concept hashes released by Wang et al.about this event: http://www.ccc.de/congress/2004/fahrplan/event/308.en.html
content
We then demonstrate a tool, Stripwire, that uses this capability to create two files – one which executes an arbitrary sequence of commands, the other which hides those commands with the strength of AES – both with the same MD5 hash. We show how this affects file-oriented system auditors such as Tripwire, but point out that the failure is nowhere near as catastrophic as it appears at first glance. We examine how this failure affects HMAC and Digital Signatures within Digital Rights Management (DRM) systems, and how the full attack expands into an unusual pseudosteganographic strikeback methodology against peer to peer networks.
Date Issued
29 December 2004
Beteiligte Person
Dan Kaminsky
Is Referenced By
21C3 Website Screenshot21C3 Website
Extent
0:50:24
Type
video/mp4
Tag
21c3
Hacking
Identifier
ark:/45490/brEAjC