yunga

1. Introduction
2. Standards
3. Common combinations
4. Conversion
5. Verification/Inspection
6. Tips for recognising

Introduction

It happens that there are many standards for storing cryptography materials (key, certificate, ...) and it isn't always obvious to know which standard is used by just looking at file name extension or file content. There are bunch of questions on stackoverflow asking about how to convert from PEM to PKCS#8 or PKCS#12, while many tried to answer the questions, those answers may not help because the correct answer depends on the content inside the PEM file. That is, a PEM file can contain many different things, such as an X509 certificate, a PKCS#1 or PKCS#8 private key. The worst-case scenario is that someone just store a non-PEM content in "something.pem" file.

yunga

# source:http://reocities.com/SiliconValley/heights/7052/opcode.txt
From: mark@omnifest.uwm.edu (Mark Hopkins)
Newsgroups: alt.lang.asm
Subject: A Summary of the 80486 Opcodes and Instructions

(1) The 80x86 is an Octal Machine
   This is a follow-up and revision of an article posted in alt.lang.asm on
7-5-92 concerning the 80x86 instruction encoding.
 
   The only proper way to understand 80x86 coding is to realize that ALL 80x86

yunga

#!/usr/bin/perl

# 	This filter changes all words to Title Caps, and attempts to be clever
#	about *un*capitalizing small words like a/an/the in the input.
#
#	The list of "small words" which are not capped comes from
#	the New York Times Manual of Style, plus 'vs' and 'v'. 
#
#	10 May 2008
#	Original version by John Gruber:

yunga

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

yunga

use strict;
use warnings;
use feature qw(say);
use Getopt::Std;

# If set to true, exit script after processing --help or --version flags
$Getopt::Std::STANDARD_HELP_VERSION = 1;
our $VERSION = "0.1";

#------------------------------------------------------------------------------#

yunga

// Use Gists to store code you would like to remember later on
console.log(window); // log the "window" object to the console

yunga

use warnings;
use Getopt::Std;

getopt('xytGgwsf',\%opts);

# pcm file = $opts{f}

# samples per pixel x
$xscale = $opts{x} // 1200;