Groups > comp.lang.java.programmer > #8955

Re: Simple alphanumeric "encryption"?

From	Lew <lewbloch@gmail.com>
Newsgroups	comp.lang.java.programmer
Subject	Re: Simple alphanumeric "encryption"?
Date	2011-10-18 08:43 -0700
Organization	http://groups.google.com
Message-ID	<13972545.1242.1318952580309.JavaMail.geo-discussion-forums@prfk19> (permalink)
References	<S8idnWT1OekbSwbTnZ2dnUVZ_q-dnZ2d@westnet.com.au> <alpine.DEB.2.00.1110171515220.10855@urchin.earth.li> <pIKdnalVhP-ubQHTnZ2dnUVZ_hCdnZ2d@westnet.com.au>

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Qu0ll wrote:
> "Tom Anderson"  wrote:
> 
> Sorry about the lack of indent...
> 
> ------------------------------------------------------------------------------------------------
> Oddly, i have a paper called "Ciphers with Arbitrary Finite Domains"
> sitting in my reading queue right not.
> 
> You have at least two basic routes of attack here.
> 
> First, recognise that alphanumerism is just an encoding of a general bit
> string. Decode the alphanumeric string into a bit string (by taking it as
> a base-36 or base-62 number, or whatever), encrypt that, then re-encode
> it. BigInteger has a constructor which takes a string and a radix, and a
> toString method which takes a radix. ... [snip]
> ------------------------------------------------------------------------------------------------
> 
> OK, thanks Tom for that - the first option looks promising.
> 
> I have 2 questions:
> 
> Is there any significance in the choice of numbers 36 and 62?

Of course.  It's the number of digit symbols available.  Using the standard 26-letter English alphabet and the numerals zero through nine, you have 36 symbols if you restrict to one case and 62 if you allow upper and lower case.

-- 
Lew

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Thread

Simple alphanumeric "encryption"? "Qu0ll" <Qu0llSixFour@gmail.com> - 2011-10-17 18:16 +1100
  Re: Simple alphanumeric "encryption"? Arne Vajhøj <arne@vajhoej.dk> - 2011-10-17 08:13 -0400
    Re: Simple alphanumeric "encryption"? Travers Naran <tnaran@gmail.com> - 2011-10-18 06:47 -0700
      Re: Simple alphanumeric "encryption"? David Segall <david@address.invalid> - 2011-10-20 00:36 +1100
  Re: Simple alphanumeric "encryption"? Andreas Leitgeb <avl@gamma.logic.tuwien.ac.at> - 2011-10-17 12:27 +0000
  Re: Simple alphanumeric "encryption"? Tom Anderson <twic@urchin.earth.li> - 2011-10-17 16:45 +0100
    Re: Simple alphanumeric "encryption"? "Qu0ll" <Qu0llSixFour@gmail.com> - 2011-10-18 14:18 +1100
      Re: Simple alphanumeric "encryption"? "Qu0ll" <Qu0llSixFour@gmail.com> - 2011-10-18 14:25 +1100
      Re: Simple alphanumeric "encryption"? Lew <lewbloch@gmail.com> - 2011-10-18 08:43 -0700
      Re: Simple alphanumeric "encryption"? Tom Anderson <twic@urchin.earth.li> - 2011-10-20 20:57 +0100
  Re: Simple alphanumeric "encryption"? B1ll Gat3s <wm.g4t3s@m1cr0s0f7.c0m> - 2011-10-17 21:33 -0400
  Re: Simple alphanumeric "encryption"? Roedy Green <see_website@mindprod.com.invalid> - 2011-10-20 13:32 -0700
  Re: Simple alphanumeric "encryption"? Roedy Green <see_website@mindprod.com.invalid> - 2011-10-20 13:36 -0700

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