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Closer Look at the Double Ratchet
In this post I try to explain the Double Ratchet Algorithm that drives the cryptography behind OMEMO and Signal. This is the second part of my series about the crypto behind OMEMO.
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Shaking Hands With OMEMO: X3DH Key Exchange
In this blog post I take a detailed look at how the Extended Triple Diffie-Hellman Key Exchange (X3DH) works. This algorithm is part of the cryptography that drives OMEMO.
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Unified Encrypted Payload Elements for XMPP
An envelope hiding the original message – Image by Bru-nO This is a proposal to extract the element encryption principle from OpenPGP for XMPP to make it applicable to other encryption protocols.
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QR-Code Generator for OMEMO
I wrote a small tool that generates QR-Codes for OMEMO fingerprints.
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Starting to use the Fellowship Card
I recently became a fellow of the FSFE and so I received a nice letter containing the FSFE fellowship OpenPGP smartcard. After a quick visual examination I approved the card to be *damn cool*, even though the portrait format of the print of it still confuses me when I look at it. I especially like,…