Mamy Ratsimbazafy mratsim

Don’t Feed the Beast – the Great Recruitment Agency Infestation

“Don’t move to that London” warned my northern grandfather once. “It’s full of spivs”.

The Oxford Dictionary (somewhat chauvinistically) defines a spiv as:

A man, typically a flashy dresser, who makes a living by disreputable dealings

“But I work in IT” I told him. “engineers aren’t like that”.

@Shnatsel wrote...

The following code is unsound:

https://github.com/actix/actix-net/blob/7c5fa25b23a802b27e8066caf4e01e3c2cedeb35/actix-service/src/cell.rs#L34-L36

This uses Rc::as_ref() to obtain a reference to the underlying data, which does not guarantee uniqueness. It is possible to obtain several mutable references to the same memory location by calling this function repeatedly:

let mycell = Cell::new(vec![1,2,3]);

Twisted Edwards & Short Weierstrass Equivalence

Putting this here since I don't see it documented anywhere in the literature.

Note that your Short Weierstrass curve must have 2-torsion.

1. Short Weierstrass -> Twisted Edwards

s = sqrt(3 * r^2 + a)

Backup android app, data included, no root needed, with adb

Note: This gist may be outdated, thanks to all contributors in comments.

adb is the Android CLI tool with which you can interact with your android device, from your PC

You must enable developer mode (tap 7 times on the build version in parameters) and install adb on your PC.

Don't hesitate to read comments, there is useful tips, thanks guys for this !

SKS Keyserver Network Under Attack

This work is released under a Creative Commons Attribution-NoDerivatives 4.0 International License.

Terminological Note

"OpenPGP" refers to the OpenPGP protocol, in much the same way that HTML refers to the protocol that specifies how to write a web page. "GnuPG", "SequoiaPGP", "OpenPGP.js", and others are implementations of the OpenPGP protocol in the same way that Mozilla Firefox, Google Chromium, and Microsoft Edge refer to software packages that process HTML data.

	// To compile
	// gcc -g -o pthread_cond_repro ./pthread_cond_repro.c -lpthread

	#include <pthread.h>
	#include <stdio.h>
	#include <stdlib.h>
	#include <stdint.h>
	#include <unistd.h>
	#include <assert.h>

	package main

	import (
	"crypto/sha256"
	"encoding/binary"
	"fmt"
	"github.com/protolambda/zrnt/eth2/core"
	"log"
	)

	"""
	https://cryptosith.org/michael/data/talks/2013-08-01-SIAMAG13.pdf
	https://www.issac-conference.org/2015/Slides/Schost.pdf
	http://www.craigcostello.com.au/pairings/PairingsForBeginners.pdf
	"""

	fresh_compute = False # Perform expensive-(ish) computations for curve orders

	field_modulus = 22369874298875696930346742206501054934775599465297184582183496627646774052458024540232479018147881220178054575403841904557897715222633333372134756426301062487682326574958588001132586331462553235407484089304633076250782629492557320825577
	desired_curve_order = 258664426012969094010652733694893533536393512754914660539884262666720468348340822774968888139573360124440321458177

	field_modulus = 4002409555221667393417789825735904156556882819939007885332058136124031650490837864442687629129015664037894272559787
	desired_curve_order = 52435875175126190479447740508185965837690552500527637822603658699938581184513

	Fp = GF(field_modulus)

	PARAM_A4 = 0
	PARAM_A6 = 4

	E = EllipticCurve(Fp, [PARAM_A4, PARAM_A6])
	E_order = E.order()