smx-smx

XZ Backdoor symbol deobfuscation. Updated as i make progress

tammoippen

import numpy as np

def crappyhist(a, bins=50, width=140):
    h, b = np.histogram(a, bins)

    for i in range (0, bins):
        print('{:12.5f}  | {:{width}s} {}'.format(
            b[i], 
            '#'*int(width*h[i]/np.amax(h)), 
            h[i], 

hellman

'''
CRC is affine.
CRC(x) = L(x) + C, where L is linear.
We want CRC(x) = L(x) + C = x.
Write as L(x)+x = C.
Solve matrix equation.
'''

from sage.all import *

elliptic-shiho

from sage.all import *
import itertools

# display matrix picture with 0 and X
# references: https://github.com/mimoo/RSA-and-LLL-attacks/blob/master/boneh_durfee.sage
def matrix_overview(BB, bound):
  for ii in range(BB.dimensions()[0]):
    a = ('%02d ' % ii)
    for jj in range(BB.dimensions()[1]):
      a += ' ' if BB[ii,jj] == 0 else 'X'

simonw

How to recover lost Python source code if it's still resident in-memory

I screwed up using git ("git checkout --" on the wrong file) and managed to delete the code I had just written... but it was still running in a process in a docker container. Here's how I got it back, using https://pypi.python.org/pypi/pyrasite/ and https://pypi.python.org/pypi/uncompyle6

Attach a shell to the docker container

Install GDB (needed by pyrasite)

apt-get update && apt-get install gdb

arthur-e

def convex_hull_graham(points):
    '''
    Returns points on convex hull in CCW order according to Graham's scan algorithm. 
    By Tom Switzer <thomas.switzer@gmail.com>.
    '''
    TURN_LEFT, TURN_RIGHT, TURN_NONE = (1, -1, 0)

    def cmp(a, b):
        return (a > b) - (a < b)

bkaradzic

Orthodox C++

What is Orthodox C++?

Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.

Why not Modern C++?

bishboria

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

mnot

Edward Snowden at IETF 93

Edward Snowden answered questions after a showing of CITIZENFOUR at the IETF93 meeting; this is a transcript of the video recording.

For more information, see the Internet Society article.

• Introduction
• Scale of Pervasive Monitoring
• Returning to the US
• Preserving the Internet

TakahikoKawasaki

#!/usr/bin/env ruby
#
# This code snippet shows how to enable SSL in Sinatra+Thin.
#

require 'sinatra'
require 'thin'

class MyThinBackend < ::Thin::Backends::TcpServer
  def initialize(host, port, options)