Flame's Windows Update hack required world-class cryptanalysis, researchers say

The Flame cyber-espionage malware makes use of a previously unknown cryptographic attack variant that required world-class cryptanalysis to develop, experts from the Dutch national research center for mathematics and computer science (CWI) said on Thursday. The cryptographic attack, known as an MD5 chosen prefix collision, was used by Flame's creators to generate a rogue Microsoft digital code-signing certificate that allowed them to distribute the malware to Windows computers as an update from Microsoft.

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