Re: [PLUG] Notes on Mark's hash table talk at Central

[Walt Mankowski <waltman@pobox.com>]

Could you contact him directly?  If he has any questions about it, I'd
just have to ask you anyway.  His email is below.

Walt

On Thu, Jan 07, 2016 at 12:09:15PM -0500, Keith C. Perry wrote:
> Walt,
> 
> Can you confirm with Mark its ok to post the video?  If so, I'll include the below information in the post.
> 
> ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ ~ 
> Keith C. Perry, MS E.E. 
> Owner, DAO Technologies LLC 
> (O) +1.215.525.4165 x2033 
> (M) +1.215.432.5167 
> www.daotechnologies.com
> 
> ----- Original Message -----
> From: "Walt Mankowski" <waltman@pobox.com>
> To: plug@lists.phillylinux.org
> Sent: Thursday, January 7, 2016 12:06:02 PM
> Subject: [PLUG] Notes on Mark's hash table talk at Central
> 
> Mark asked me to forward this to this mailing list.  I don't believe
> he's subscribed to the list, so please direct questions about the talk
> directly to him.
> 
> Walt
> 
> ----- Forwarded message from Mark Dominus <mjd@plover.com> -----
> 
> Date: Thu, 07 Jan 2016 16:59:25 +0000
> From: Mark Dominus <mjd@plover.com>
> To: Walt Mankowski <waltman@pobox.com>
> Subject: Re: Slide corrections
> X-Mailer: Perl5 Mail::Internet v2.14
> 
> Thanks for corrections!
> 
> Would you please forward this note to the PLUG mailing list for me?
> 
> 	Thanks for inviting me to speak and for being such an engaged
> 	audience; this was my 13th annual December talk for PLUG, and
> 	I hope to see you back next year.
> 
> 	The slides from last night's presentation are at
> 
> 	    http://perl.plover.com/yak/HashHistory/
> 
>         and there are detailed notes at 
> 
> 	    http://perl.plover.com/classes/HashHistory/samples/NOTES.html
> 
>  	In particular, the discussion of SNOBOL tables, which I had to
>         omit because I wasted too much time with a long introduction, is at 
> 
> 	    http://perl.plover.com/classes/HashHistory/samples/NOTES.html#snobol
> 
> 	Rachel asked a question about the suitability of MD5 as a
> 	random number generator.  MD5 is no longer considered
> 	sufficiently secure to be used for cryptographic applications.
> 	Differential cryptography techniques have resulted in
> 	successful collision attacks on MD5; this means it is now
> 	possible to find two inputs that hash to the same output.
> 	(See https://en.wikipedia.org/wiki/MD5#Collision_vulnerabilities )
> 	However, as far as I know there is still no effective way to
> 	predict what the output will be for a given input, so MD5's
> 	usefulness as a random number generator is unimpaired.
> 	Disclaimer: Cryptography is difficult and I am not an expert.
> 
> 	I'll be glad to answer questions by email.
> 
>         P.S. At Clarkville I posed the following problem:
> 
>             If a right triangle has a hypotenuse with length 10, and
>             the perpendicular dropped from the opposite vertex has
>             length 6, what is the area of the triangle?
> 
>         The obvious answer, 30, is wrong, and the puzzle is to figure out why. 
> 
>         The answer, should you want to see it, is at
> 
> 	    http://math.stackexchange.com/q/1594740/25554
> 
> 
> ----- End forwarded message -----
> 
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