Hey! I'm David, cofounder of zkSecurity and the author of the Real-World Cryptography book. I was previously a crypto architect at O(1) Labs (working on the Mina cryptocurrency), before that I was the security lead for Diem (formerly Libra) at Novi (Facebook), and a security consultant for the Cryptography Services of NCC Group. This is my blog about cryptography and security and other related topics that I find interesting.

Hack of Cupid Media dating website exposes 42 million plaintext passwords posted November 2013

The compromise of 42 million passwords makes the episode one of the bigger passcode breaches on record.

More than 1.9 million accounts were protected by 123456. Another 1.2 million used 111111.

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