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@tuansoibk
tuansoibk / cryptography-file-formats.md
Last active September 22, 2024 14:54
Cryptography material conversion and verification commands
  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.

@seanjensengrey
seanjensengrey / octal_x86.txt
Last active November 13, 2024 16:40
x86 is an octal machine
# source:http://geocities.com/SiliconValley/heights/7052/opcode.txt
From: [email protected] (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
@weibeld
weibeld / getopt-std.pl
Last active October 30, 2022 08:24
Reference example for using the Getopt::Std Perl module
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";
#------------------------------------------------------------------------------#
#!/usr/bin/env bash
# Download HTML converted from provided Markdown, using GitHub API v3
##
md2html(){
if [[ $# -ne 2 ]]; then
echo "ERROR.\nSYNTAX: Markdown_To_HTML <markdown-filepath> <dest-html-filepath>"
return
fi
unset _markdown_filepath
@killercup
killercup / pandoc.css
Created July 3, 2013 11:31
Add this to your Pandoc HTML documents using `--css pandoc.css` to make them look more awesome. (Tested with Markdown and LaTeX.)
/*
* I add this to html files generated with pandoc.
*/
html {
font-size: 100%;
overflow-y: scroll;
-webkit-text-size-adjust: 100%;
-ms-text-size-adjust: 100%;
}
@willurd
willurd / web-servers.md
Last active November 13, 2024 13:44
Big list of http static server one-liners

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000
@iaian
iaian / sublimeText2_contextMenu.reg
Last active January 15, 2019 15:46
Add SublimeText 2 context menu to windows explorer. If item is folder, context menu has option "open in sublimetext project". If is file, "open in sublime text 2" option is added to context menu. Tested on windows 7
Windows Registry Editor Version 5.00
; This will make it appear when you right click ON a folder
; The "Icon" line can be removed if you don't want the icon to appear
[HKEY_CLASSES_ROOT\Directory\shell\sublime]
@="Open Folder as Sublime Project"
"Icon"="\"C:\\Program Files\\Sublime Text 2\\sublime_text.exe\",0"
[HKEY_CLASSES_ROOT\Directory\shell\sublime\command]
@jboner
jboner / latency.txt
Last active November 15, 2024 14:00
Latency Numbers Every Programmer Should Know
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
@defunkt
defunkt / zombies.md
Created December 29, 2010 22:57
—All You Zombies— by Robert A. Heinlein

All You Zombies

2217 Time Zone V (EST) 7 Nov. 1970--NTC-- "Pop's Place": I was polishing a brandy snifter when the Unmarried Mother came in. I noted the time---10:17 P. M. zone five, or eastern time, November 7th, 1970. Temporal agents always notice time and date; we must.

The Unmarried Mother was a man twenty--five years old, no taller than I am, childish features and a touchy temper. I didn't like his looks---I never had---but he was a lad I was here to recruit, he was my boy. I gave him my best barkeep's smile.

Maybe I'm too critical. He wasn't swish; his nickname came from what he always said when some nosy type asked him his line: "I'm an unmarried mother." If he felt less than murderous he would add: "at four cents a word. I write confession stories."

If he felt nasty, he would wait for somebody to make something of it. He had a lethal style of infighting, like a female cop---reason I wanted him. Not the only one.