cryptography

  • 15th January 2026

Old pencil and paper cryptosystems.

As you may have seen from my site, I have long been interested in old pencil and paper cryptosystems, even before getting hooked on computers. Over the years, I have re-implemented a few of them in various languages:

  • Old BASIC on my Sinclair QL like ages ago
  • Like 15 years ago in Ruby
  • Then in Go when I learned the language in 2016
  • And more recently in, what else, Rust
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  • 17th September 2018

Golang API wrapper for the SSLabs API

Preambule

I have now completed my API Wrapper series with this new one for the SSLLabs API, currently at v3. It is the perfect complement to the Cryptcheck) API and the Mozilla Observatory one I published earlier.

Welcome to the Golang API wrapper, now at version 0.10.0 (and using Semantic Versioning to ensure compatibility) and available on Github there.

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  • 13th August 2018

Golang API wrapper for the Mozilla Observatory

Preambule

Like I did for the cryptcheck.fr API in the previous article), please welcome the API wrapper for the Mozilla Observatory API. The Mozilla Observatory is a site which include many tests for websites including TLS (SSLLabs & Cryptcheck) and HTTP-related ones (XSS protection, X-Frame, Content Security Policy and many others).

My Golang API wrapper, now at version 1.0.0 (and using Semantic Versioning to ensure compatibility) is available on Github there.

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  • 9th May 2018

Golang API wrapper for cryptcheck.fr

Preambule

Many of you know the SSLLabs site. Built by Qualys, Inc., it enables anyone to test various

TLS -related parameters for given website running on port 443 (the default for TLS). But did you know there is also the cryptcheck.fr one? Formerly known as Imirhil, it allow not only for https websites to be tested but also

SMTP ,

IMAP ,

SSH and general TLS (using a different port like a few API do) ones.

Both are integrated in the Mozilla Observatory which also include more tests such as HTTP headers and whether a given site is pre-loaded in browsers (

HSTS ).

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  • 12th February 2015

The Imitation Game

This is a Followup on the previous article

Just saw the Imitation Game yesterday night, in VOST 1 in Paris.

Imitation Game

Mild spoilers below, do not read if you intend to watch it :)

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  • 9th February 2015

Alan Turing, Bletchley Park and the Enigma

Alan Turing

Everybody (maybe even the dog 1) is speaking of the 2014 movie called “The Imitation Game” with Benjamin Cumberbatch starring as

Alan Turing but how many really know him?

For many people, Alan Turing is one of the fathers of the modern computer (along with

John Von Neumann ) and rightfully so. What they need to know and what the movie is trying to do (I have yet to see it) is to show how influential he was.

Alan Turing
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