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About randomity, entropy, random passwords - was Re: Noob dumb question
From: |
Jean Louis |
Subject: |
About randomity, entropy, random passwords - was Re: Noob dumb question (extending emacs) |
Date: |
Mon, 25 Oct 2021 22:54:35 +0300 |
User-agent: |
Mutt/2.0.7+183 (3d24855) (2021-05-28) |
* Michael Heerdegen <michael_heerdegen@web.de> [2021-10-25 16:22]:
> Jean Louis <bugs@gnu.support> writes:
>
> > Do you say you can predict outcome of my `rcd-password' function?
>
> Yes, I said I can predict the outcome using unlimited trials.
>
> > Send contract, I sign it.
>
> Cool!
>
> How do you plan to test whether your password is in my trials? You will
> receive a lot of trials, and I want to be sure you don't cheat. Because
> it will take some time.
Hey... but I am not going to spend time checking terrabytes of your
trials.
You have got unlimited trials that you do on yourside, not that I work
for you and finally pay you for my work.
That is called brute force. Not an algorithm that breaks the function
and predicts its outcome.
Emacs Lisp function `random' is quite handy and definitely not random
enough as such. But with little support of Emacs Lisp it becomes very
random. The matter is solved by providing a new seed. If seed is
pretty random, then `random' becomes random.
Here is enough entropy that it can generate random passwords:
(defun rcd-random-md5-string ()
(md5 (concat (emacs-uptime) (format-time-string "%N %6N %3N"))))
(rcd-random-md5-string) ⇒ "37c981115ec8cd7455667e1ad57e894b"
(defun rcd-password-generate-1 (string)
"Return capitalized or downcased single symbol from a string"
(random (rcd-random-md5-string))
(let* ((max (length string))
(rnd (random max))
(single (substring string rnd (+ rnd 1))))
single))
(rcd-password-generate-1 "!@#$%^&*()-=+_[]{}|)ABCDEFGHIJKLMNOPQRSTUVWHYZ") ⇒ "Y"
(rcd-password) ⇒ "wqg9@avJ@fErcvI4rrKt"
Good enough for websites, system accounts, chat accounts, etc.
--
Jean
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- Re: Noob dumb question (extending emacs), (continued)
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/24
- Re: Noob dumb question (extending emacs), Michael Heerdegen, 2021/10/24
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/24
- Re: Noob dumb question (extending emacs), Michael Heerdegen, 2021/10/25
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/25
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/25
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/25
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/25
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/25
- Re: Noob dumb question (extending emacs), Michael Heerdegen, 2021/10/25
- About randomity, entropy, random passwords - was Re: Noob dumb question (extending emacs),
Jean Louis <=
- Message not available
- Message not available
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/27
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/23
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/23
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/24
- Re: Noob dumb question (extending emacs), Michael Heerdegen, 2021/10/24
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/24
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/24
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/24
- Re: Noob dumb question (extending emacs), Emanuel Berg, 2021/10/24
- Re: Noob dumb question (extending emacs), Jean Louis, 2021/10/25