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It turns out there's a significant flaw in the approach. Because both the medallion and hack numbers are structured in predictable patterns, it was trivial to run all possible iterations through the same MD5 algorithm and then compare the output to the data contained in the 20GB file. Software developer Vijay Pandurangan did just that, and in less than two hours he had completely de-anonymized all 173 million entries.
According to chat logs recorded by Monsegur at the behest of the FBI and obtained by Motherboard, the informant directed hackers to pilfer as much data as possible from ManTech's servers as investigators stood by. Stolen data was published as the third installment of AntiSec's ... collection of leaks intended to embarrass the same federal agency that presided over the hack and others.
At this point we took action to take control back of our panel by changing passwords, however the intruder had prepared for this and had already created a number of backup logins to the panel and upon seeing us make the attempted recovery of the account he proceeded to randomly delete artifacts from the panel.
From the article: "With HTTPA, each item of private data would be assigned its own uniform resource identifier (URI), a component of the Semantic Web that, researchers say, would convert the Web from a collection of searchable text files into a giant database. Every time the server transmitted a piece of sensitive data, it would also send a description of the restrictions on the data’s use. And it would also log the transaction, using the URI, in a network of encrypted servers."
The message that the TrueCrypt posted about the security of the software also was included in the release of version 7.2a. The OCAP team decided to focus on version 7.1a and created the verified repository by comparing the SHA2 hashes with files found in other TrueCrypt repositories. So the files are the same as the ones that were distributed as 7.1a. "These files were obtained last November in preparation for our audit, and match the hash reported by iSec in their official report from phase I of the audit," said Kenn White, part of the team involved in the TrueCrypt audit.