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.

Tamuro meetup in London tonight posted August 2018

I will be at Tamuro tonight. It's a security/crypto meetup where we mostly drink beers and chat.

To know the location you need to solve one of the challenges there summarized here as well:

EASY: Decrypt the cipertext (single byte XOR) to find the GPS coordinates of the next Tamuro London meetup: 6d69766d686f69747568766861686e (hex string)
MEDIUM: Solve the easy challenge without a brute-force method.
HARD: https://gist.github.com/tkeetch/b1b21f621813ff11a75930f80f1c9e5b

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