mattm7n

# Monitoring on interface eth0
tcpdump -i eth0 -n port 67 and port 68

leommoore

#OpenSSL Basics

##Certificate Types

• CA Certificate Authority
• CRL Certificate Revocation List
• CSR Certificate Signing Request
• DCA Deligate Certificate Authority
• DER Data Encryption Standard
• DES Data Encryption Standard
• DH Diffie-Hellmann

wvuong

package com.willvuong.foodie.controller;

import com.willvuong.foodie.dao.PlaceRepository;
import com.willvuong.foodie.domain.Place;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;

patriques82

Equality
The equal? method is defined by Object to test whether two values refer to exactly the same 
object. For any two distinct objects, this method always returns false:

   a = "Ruby" # One reference to one String object
   b = c = "Ruby" # Two references to another String object
   a.equal?(b) # false: a and b are different objects
   b.equal?(c) # true: b and c refer to the same object

By convention, subclasses never override the equal? method. The == operator is the most common 

davewongillies

General OpenSSL Commands

These commands allow you to generate CSRs, Certificates, Private Keys and do other miscellaneous tasks.

Generate a new private key and Certificate Signing Request

openssl req -out CSR.csr -new -newkey rsa:2048 -nodes -keyout privateKey.key

5v3n

root@gretelomat:~# lsusb
Bus 001 Device 002: ID 058f:6254 Alcor Micro Corp. USB Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 005: ID 0b05:17cb ASUSTek Computer, Inc. 
Bus 001 Device 004: ID 058f:6366 Alcor Micro Corp. Multi Flash Reader
root@gretelomat:~# echo 0b05 17cb  > /sys/bus/usb/drivers/btusb/new_id
root@gretelomat:~# hciconfig 
hci0:	Type: BR/EDR  Bus: USB
	BD Address: 00:02:72:C9:0E:AA  ACL MTU: 1021:8  SCO MTU: 64:1
	DOWN 

soarez

How to setup your own CA with OpenSSL

For educational reasons I've decided to create my own CA. Here is what I learned.

First things first

Lets get some context first.

Kartones

PSQL

Magic words:

psql -U postgres

Some interesting flags (to see all, use -h or --help depending on your psql version):

• -E: will describe the underlaying queries of the \ commands (cool for learning!)
• -l: psql will list all databases and then exit (useful if the user you connect with doesn't has a default database, like at AWS RDS)

harish-r

/* Binary Search Tree Implementation in C */
/* Harish R */

#include<stdio.h>
#include<stdlib.h>

struct TreeNode
{
    int data;
    struct TreeNode* left;

iangreenleaf

Rails naming conventions

General Ruby conventions

Class names are CamelCase.

Methods and variables are snake_case.

Methods with a ? suffix will return a boolean.