25 Years of Loud, Expensive Space Heaters.

A half-written draft of this piece has been living on my HDD for nearly half a year. Recent discussions re: the subject of “aging and death of PC irons” prompted me to dust it off and quickly post. Regularly-scheduled programming will resume shortly…

“The [...]

The Serpent Cipher’s Key Schedule Transform is Injective.

This article is a continuation of the previous, and concludes the series.

Let’s try this somewhat different variant of the program, which represents recurring bits of the expansion symbolically (and in a slightly more readable form) [...]

The Serpent Cipher’s Key Schedule Equation System, in Graphical Form.

This article is a continuation of the dig into the key schedule of the Serpent cipher.

For clarity, we will omit the routines already given in the previous article.

Let’s visualize the Serpent [...]

Serpent Cipher’s Key Schedule in Algebraic Form: with Reduction.

This article is a continuation of the recent mega-puzzler concerning the experiment.

This variant will reduce the equations. We will omit printing the input matrix, for brevity. And so:

;; Register bitness.
(defconstant +bitness+ 32)
 
(defun flatten (l)
[...]

Terms -8…8 of the Serpent Cipher’s Key Schedule in Algebraic Form.

This article is a byproduct of the recent mega-puzzler concerning the Serpent cipher’s key expansion procedure.

Behold:

;; Register bitness.
(defconstant +bitness+ 32)
 
(defun make-reg (reg-name bitness)
"Make algebraic representation of a register (bits in descending majority)"
(loop for i from [...]

Serpent in ICE40, Part 2.

This article is a continuation of “Can the Serpent Cipher fit in the ICE40 FPGA?”.

Below is a revision of the forward S-box of Serpent from the previous article, with all of the S-Box equations rewritten in the same form, [...]

Can the Serpent Cipher fit in the ICE40 FPGA?

The question of whether the Serpent cipher could fit in a ICE40 FPGA was posed recently, and my first thought was: why not bake what appears to be the heaviest moving part, and see how many gates it requires? Then it will be possible to estimate whether the entire thing [...]

Vectored Signatures, or the Elements of a Possible V-Algebra.

Once upon a time (in August of ‘15, to be exact) I wrote a very simple versionatron called ‘V‘.
Edit: See also Ben Vulpes’s excellent introduction to V.
V is a carefully-designed poison against the scurrying little vermin who feed on the proverbial ‘fear, uncertainty, and doubt.’
For readers who are not in the little circle of folks [...]

Practical Blockchain Telegraphy.

Mircea Popescu writes:
‘Now making an irc channel is quite the pleasant experience : you create something out of nothing, get to name it and are now the boss of it. For a generation devoid of proper “empire building” avenues, this is about as cool as it gets. So you can do anything you wish, right [...]

Tungsten Will Melt in Your Mouth!

But, of course – it won’t.
But let’s imagine that it were in someone’s financial – hell, geopolitical! interest – to convince the public that it will. The New York Times editorial might go like this: ‘you may have heard of tungsten, a metal, just like gallium; the latter, a favourite among stage magicians for melting at body temperature…’
Now, it [...]

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