Simon Willison’s Weblog

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2008

Researchers Show How to Forge Site Certificates. Use an MD5 collision to create two certificates with the same hash, one for a domain you own and another for amazon.com. Get Equifax CA to sign your domain’s certificate using the outdated “MD5 with RSA” signing method. Copy that signature on to your home-made amazon.com certificate to create a fake certificate for Amazon that will be accepted by any browser.

# 30th December 2008, 3:27 pm / collisions, edfelten, equifaxca, hashes, md5, security, ssl