Hacking: Simplest backdoor using ssh.

backdoor is software that allows access to computer system, a call to certain function.
backdoors are left by programmers & hackers to *easily & quickly* gain access to hacked or normally accessed machine at later time.

there are also different, more sophisticated backdoors available.

need to keep practicing to have it done really quickly if need arises. i'd practice it for 2 months once a day on both computers, then after that time - once per two weeks till end of my life. it's so important in my opinion. very simple skill for professional IT person, but quite efficient & useful.

useful skill for any net admin, to protect hardware-software infrastructure against data leaks or machine control attempts of this type - especially if combined with programming or scripting.

more details: itsecinreal.blogspot.com/2014/…