wranai

What's this all about?

Digital cryptography! This is a subject I've been interested in since taking a class with Prof. Fred Schneider back in college. Articles pop up on Hacker News fairly often that pique my interest and this technique is the result of one of them.

Specifically, this is about Lamport signatures. There are many signature algorithms (ECDSA and RSA are the most commonly used) but Lamport signatures are unique because they are formed using a hash function. Many cryptographers believe that this makes them resistant to attacks made possible by quantum computers.

How does a Lamport Signature work?

	# based on a problem posted in a SO question: https://stackoverflow.com/questions/53236513/procedural-modelling-classical-chinese-visions-of-political-order

	import random

	NUM_PEOPLE = 5

	ROUNDS = 10

	GENEROSITY_MIN = 0.01
	GENEROSITY_MAX = 0.10

	from __future__ import print_function
	import torch
	import torch.nn as nn
	import torch.nn.functional as F
	from torch.autograd import Variable

	def sample_gumbel(shape, eps=1e-20):
	U = torch.rand(shape).cuda()
	return -Variable(torch.log(-torch.log(U + eps) + eps))

	#!/bin/bash
	#Make sure we’re running with root permissions.
	if [ `whoami` != root ]; then
	echo Please run this script using sudo
	echo Just type “sudo !!”
	exit
	fi

	#Check for 64-bit arch
	if [uname -m != x86_64]; then

	-- script.lua
	-- Receives a table, returns the sum of its components.
	io.write("The table the script received has:\n");
	x = 0
	for i = 1, #foo do
	print(i, foo[i])
	x = x + foo[i]
	end
	io.write("Returning data back to C\n");
	return x

	/*
	-----------------------------------
	Emoji - natural display for the web
	-----------------------------------

	These font face definitions allows to display emoji glyphs intermingled with
	arbitrary characters outside emoji unicode blocks.


	Usage

	#!/usr/bin/env python

	"""
	Frequency shift a signal using SSB modulation.
	"""

	import numpy as np
	import scipy as sp
	import scipy.signal
	import matplotlib.pyplot as plt