Hey! I'm David, a security consultant at Cryptography Services, the crypto team of NCC Group . This is my blog about cryptography and security and other related topics that I find interesting.

If you don't know where to start, you might want to check these blogposts:

BEAST: the CBC Attack on TLS
Maybe You Shouldn't Skip SHA-3
How to Backdoor Diffie-Hellman
Let's Encrypt Overview
Fault attacks on RSA signatures
Hash-Based Signatures: a 4-part Series

Here are the latest links posted:

22 Sep On The Security Of The Pkcs#1 V1.5 Signature Scheme
21 Sep Roughtime: Securing Time With Digital Signatures
20 Sep Constraint Solver
20 Sep Introducing The Librem Key
20 Sep Introducing The Cloudflare Onion Service

You can also suggest a link.

Defcon CTF 2009 write up comic

posted November 2014

sapheads

The Sapheads team draw a comic as a write up for the finale of the Defcon CTF in 2009. Since it's a classic here it is

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