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From: Stefan Claas <fgrsna.pynnf@vagrearg.eh>
Newsgroups: sci.crypt
Subject: Re: lun - Lucky Number
Date: Sat, 8 Mar 2025 19:50:44 +0100
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Stefan Claas wrote:
> Rich wrote:
> > Stefan Claas <fgrsna.pynnf@vagrearg.eh> wrote:
> > > Hi all,
> > > 
> > > from the previous discussion with Richard I came up with a new idea to
> > > create a random number. I call the Go program lun = Lucky Number.
> > 
> > How /random/ do you want this number to be?
> > 
> > > Here is a sample run with 3 seconds set.  You can also use1 or many 
> > > more seconds.
> > > 
> > > $ lun 3
> > > 
> > > Started: 2025-03-08 01:29:57
> > > 
> > > 2287128966796887 1741393797 2287130708190684
> > > 2443764953918824 1741393798 2443766695312622
> > > 8241182675020522 1741393799 8241184416414321
> > > 
> > > Ended: 2025-03-08 01:29:59
> > > Time elapsed: 00:00:03
> > > Multiplying: 2287130708190684 * 8241184416414321
> > > Your lucky number is: 18848665950643714819328816385564
> > > SHA256: 28fd1445771c772f403eb4092b722640a529b5c84c3ee50bc6d631454e83daed
> > > 
> > > The first column is a random number
> > 
> > So, you already have a *random number*.  Why do any more?
> > 
> > > , the second the local Unix-Epoch-Time
> > 
> > Very *not* random.
> > 
> > > and the third shows the addition of column1 and column2.
> > 
> > Provided the random number was "good enough randomness" this has no 
> > benefit.
> > 
> > > The lucky number was generated by multiplying the first and last 
> > > value of the right column.
> > 
> > The product R1 * R2 is little different, randomness wise, from the 
> > product R1 * (R2 + Predictable_Offset).  If you can generate random 
> > numbers, what is the value in computing R1 * (R2 + Predictable_Offset)?
> > 
> > > Hope you like the idea!
> > 
> > I fail to see any point to it.
> > 
> > If you can generate a random number, then you already have a random 
> > number.  You can stop here and enjoy using your random number.
> 
> Why do you always have something to "complain" about? Enjoy the software,
> it is cool and not so boring like using /dev/urandom. Or better instead
> of "complaining" do something creative, crypto wise and show it to us too.

Not to mention that you can do lun with a pencil and paper to get good
entropy (where humans fail) for a password, because it is simple and
easy to understand.

Regards
Stefan


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