Protocol design

Designing, reviewing and implementing the message exchanges two systems rely on for security.

In Protocol design

2 articles

Security engineering6 MIN READ

When should you design a security protocol, and when should you not?

Almost every custom security protocol should have been a profile of an existing one. The few that are justified share a specific set of constraints - and a review process that assumes the first design is wrong.

21 May 2026

Cryptographic engineering6 MIN READ

Hybrid key exchange: what it protects and what it costs

Combining a classical and a post-quantum key exchange is now the default for TLS. Understanding why the combination is used—and what it adds to every handshake—makes the deployment decision straightforward.

28 April 2026

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In Protocol design

When should you design a security protocol, and when should you not?

Hybrid key exchange: what it protects and what it costs

A useful signal, when there is one.

Take the thinkinginto your next discussion.

Take the thinking
into your next discussion.