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:

20 Nov Some Notes About Http/3
19 Nov An Introduction To Quantum Computation And Quantum Communication By Rob Pike (2000)
17 Nov End-To-End Secure Mobile Group Messaging With Conversation Integrity And Deniability
16 Nov Zinc: A New Kernel Cryptography Api
16 Nov Efail: Breaking S/mime And Openpgp Email Encryption Using Exfiltration Channels (Blackhat)

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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