Dan Shumow

Dan Shumow is a cryptographer working at Microsoft Research.

At the CRYPTO 2007 conference rump session, Dan Shumow and Niels Ferguson presented an informal paper describing a kleptographic backdoor in the NIST specified Dual_EC_DRBG cryptographically secure pseudorandom number generator.[1] The backdoor was confirmed to be real in 2013 as part of the Edward Snowden leaks.

Dan Shumow co-authored an algorithm for detecting SHA-1 collisions with Marc Stevens, prior to the demonstration of a SHA-1 collision.[2]

References
  1. http://rump2007.cr.yp.to/15-shumow.pdf
  2. http://shattered.io


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