Sachin-A

Argon2

• Argon2 is a key derivation function that was selected as the winner of the Password Hashing Competition in July 2015. It was designed by Alex Biryukov, Daniel Dinu, and Dmitry Khovratovich from University of Luxembourg.
• It uses the BLAKE2 hash algorithm to securely scramble input data (password and salt).

Introduction

Problems with existing designs

• Should the memory addressing (indexing functions) be input-independent or input-dependent, or hybrid?
• Is it better to fill more memory but suffer from time-space tradeoffs, or make more passes over the memory to be more robust?
• How should the input-independent addresses be computed? Several seemingly secure options have been attacked.

sooryan

BLAKE2

• BLAKE2 is an improved version of the SHA-3 finalist BLAKE, and was designed by a team of experts in cryptanalysis, implementation, and cryptographic engineering; namely Jean-Philippe Aumasson, Samuel Neves, Zooko Wilcox-O'Hearn and Christian Winnerlein.

• BLAKE2s (the one checksum currently uses) computes a message digest that is 256 bits long, and represented as a 64-character hexadecimal number, e.g. 4264cb256d94533b6e152da59256638bc6adfda3efc5550d7607d4e6e45592fc.

Types

• BLAKE2b (or just BLAKE2) is optimized for 64-bit platforms and produces digests of any size between 1 and 64 bytes.

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

karlcow

{
    "folders": [{
        "path": "/Users/karl/code/mozilla-central"
    }],
    "settings": {
        "trim_trailing_white_space_on_save": false
    },
}

fbrozovic

Debian on ThinkPad W540

This is a short write-up of my experiences with installing Debian on a ThinkPad W540.

All commands should be run as root, unless indicated otherwise.

Table of Contents

Debian Install Notes

mattiaslundberg

# Install ARCH Linux with encrypted file-system and UEFI
# The official installation guide (https://wiki.archlinux.org/index.php/Installation_Guide) contains a more verbose description.

# Download the archiso image from https://www.archlinux.org/
# Copy to a usb-drive
dd if=archlinux.img of=/dev/sdX bs=16M && sync # on linux

# Boot from the usb. If the usb fails to boot, make sure that secure boot is disabled in the BIOS configuration.

# Set swedish keymap

parzonka

/**
 * Gets the stack trace from the given throwable.
 *
 * @param throwable
 * 			a throwable
 * @return stack trace as string
 */
public static String getStackTrace(Throwable throwable) {
	final StringWriter stringWriter = new StringWriter();
	throwable.printStackTrace(new PrintWriter(stringWriter));

scy

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

• From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
• That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

iheanyi

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Typeface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.TextView;

taxilian

#include <boost/filesystem.hpp>
#include "SystemHelpers.h"
using namespace boost::filesystem;

/// ...


    void getLoggingMethods( FB::Log::LogMethodList& outMethods )
    {
        path appDataPath = FB::System::getLocalAppDataPath("CompanyName");