Howtos:
For connecting to remote computers in a safe and secure way ssh would have to be the best thing since sliced bread. The protocol is encrypted so no information is passed in clear text for the evil black hats to sniff and snuff for future attacks. Telnet, which is an old favourite, passes all of its information in clear text so passwords and other juicy bits of information can easily be hijacked by unwanted parties.
The problem is that if you have to connect to the remote machine several times a day or you want to write a script for automatically controlling the remote machine it becomes a pain to have to continously type in the password or baby sit the script so you can feed it when it asks for input.
With the use of public and private keys ssh authorization can be set up and this provides a secure way of connecting to remote machines without having to type in a password. This saves a lot of time for frequent connections and makes scripting a lot easier.
However there is the problem of getting your public key to the other machine and setting it up. It can be done several ways but I have figured out how to securely add the public key of your machine to the remote machines authorized_keys file with one single command line.
How to add ssh authorization with one command
A dictionary attack also exploits the tendency of people to choose weak passwords, and is related to the previous attack. Password cracking programs usually come equipped with “dictionaries”, or word lists, with thousands or even millions of entries of several kinds, including:
=> Words in various languages
=> names of people
=> Places
=> Commonly used passwords etc
However you can use the existence of these dictionary attack tools demonstrates the relative strengths of different password choices against such attacks.
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