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 Forum index » Off-Topic Area » Security
How to increase the security!
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01micko


Joined: 11 Oct 2008
Posts: 7522
Location: qld
PostPosted: Wed 26 Sep 2012, 20:32    Post_subject:  
Barkin wrote:
Just remembered Puppy can calculate MD5 via console (aka terminal) ... http://puppylinux.org/wikka/md5sum

http://www.puppylinuxfaq.org/how-to/20-linux-tips/44-copy-and-paste-to-terminal.html


Just two points I'd like to make here:

1. There is the chance of error when you put your text into a file and run md5sum. There can be no whitespace on the end of the string or carriage returns. If you produce it using "echo" you must use /bin/echo, that is, echo -n.

2. If you store that file then there isn't much point! An attacker could easily get hold of the file.
You can run md5sum from stdin like so:
Code:
# echo -n '5&kr&t'|md5sum
5622165cab4eb0217daa09f574bd3c3d  -
capture24653.jpg
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 Filesize   55.31 KB
 Viewed   237 Time(s)

capture24653.jpg

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Barkin


Joined: 12 Aug 2011
Posts: 594
PostPosted: Thu 27 Sep 2012, 04:22    Post_subject:  
01micko wrote:
2. If you store that file then there isn't much point! An attacker could easily get hold of the file.
You can run md5sum from stdin like so:
Code:
# echo -n '5&kr&t'|md5sum
5622165cab4eb0217daa09f574bd3c3d  -


That was just to show the MD5 calculators were in agreement, I did say not to write down the salt 5&kr&t ...
Barkin wrote:
... the real passwords are MD5s of those words in quotes plus a secret string of characters I have committed to memory and never write down, e.g. 5&kr&t

It's the only thing you have to memorize to have an unlimited number of secure passwords.
BTW I use something longer than 5&kr&t as a salt : I use a 15 character string not in the dictionary,

So even if someone knows my list of dummy passwords and the method I've used they will still have to do a brute force attack on a 15 character unknown which could take some time ...

Quote:
It would take a desktop PC about 157 billion years to crack your [15 character] password

http://howsecureismypassword.net/

Quote:
Time Required to Exhaustively Search this [15 character] Password's Space:
Online Attack Scenario:
(Assuming one thousand guesses per second) 1.49 hundred thousand trillion centuries
Offline Fast Attack Scenario:
(Assuming one hundred billion guesses per second) 1.49 billion centuries
Massive Cracking Array Scenario:
(Assuming one hundred trillion guesses per second) 1.49 million centuries
Note that typical attacks will be online password guessing
limited to, at most, a few hundred guesses per second.

https://www.grc.com/haystack.htm

The above times do not include the additional time taken to calculate the MD5 for each guess: MD5 (DummyPassword+BruteForceGuess).
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