PCB Radiography Kindergarten.

Below is the result of test-firing a newly-installed miniature PCB radiography system.
The victim is a standard FG TRNG Analogue Unit:
Click for full resolution (Warning: 14MB)

Detail of left op amp, with bonding whiskers visible:

The substrate, aluminum RF shield frame, SMT contacts, vias, and the two layers of the PCB are clearly distinguishable. Likewise resistors (nearly transparent) [...]

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) [...]

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.


;; 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 [...]

Open Problem: Delousing the Asus C101PA.

Apr. 26 update: This article is obsolete, the pill — was found; if you have this machine, scroll to the end.

The Asus C101PA Chromebook is a very interesting device: it contains a Rockchip CPU, for which we already have a working deloused Gentoo; it also contains such marvels as a non-blobulous Marvell 802.11 card, a [...]

On the Matter of Brian Krebs.

The WWW of Brian Krebs, perhaps the second-most-worshiped1 patron saint to all English-speaking “computer security” charlatans — is sitting sadly offline today on account of a ~TB/sec DDOS flood.2
His titanic bandwidth, it turns out, was provided gratis by Akamai – spamatronicists par excellence and industrial-scale enablers of everything that makes the modern-day WWW a rancid [...]

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 [...]

Comrade Ogilvy Nakamoto.

From the ‘Dear Idiots, ‘1984′ is Not a How-To Guide’ department:

He might turn the speech into the usual denunciation of traitors and thought-criminals, but that was a little too obvious, while to invent a victory at the front, or some triumph of over-production in the Ninth Three-Year Plan, might complicate the records too much. What [...]

Modern Chumpatronic Engineering.

A reader recently asked me to comment on the demise of MtGox and its implications for Bitcoin enthusiasts.
I refused to do so, on account of the MtGox scam having been thoroughly beaten to death elsewhere – long before the recent and final convulsive fit people erroneously describe as ‘its demise.’ – The unwashed masses, eager [...]

Mechanics of FLUXBABBITT.

The public discovery of FLUXBABBITT, a modestly-clever American spy gadget – that may or may not have been “fired in anger” yet – has provoked the usual flood of media garbage (“JTAG is a Chinese back door! Threat or menace?”) What follows is some basic investigation regarding the plausible workings of this device, based only [...]

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