david wong

Hey! I'm David, a security engineer at the Blockchain team of Facebook, previously a security consultant for the Cryptography Services of NCC Group. I'm also the author of the Real World Cryptography book. This is my blog about cryptography and security and other related topics that I find interesting.

My talk on SHA-3 and derived functions at DEF CON 25 posted December 2017

The talk I gave at defcon this year is online

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Great talk, but please defer chats with the audience next time ;)


ah yeah :) this talk definitely taught me to be faster to "take things offline"

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