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Groups > comp.lang.java.programmer > #8934

Re: Simple alphanumeric "encryption"?

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On 17/10/2011 3:16 AM, Qu0ll wrote:
> I need to be able to encrypt/code an arbitrary string of up to about 50
> alphanumeric characters into a string that also contains only
> alphanumeric characters. All of the encryption algorithms I have looked
> result in strings with non-ASCII characters in them (when the resulting
> bytes are turned into a string) which is not suitable.
>
> Is there a simple way to do this? It must be able to successfully be
> decrypted as well but doesn't need to be very sophisticated or extremely
> secure.

Option 1: Blowfish, or whatever, followed by binhex or whatever.

Option 2: A canned solution such as PGP/GPG which can be set to "ascii 
armor" mode. The graphical frontend Kleopatra has a checkbox for this. 
If you've ever seen an email or news post with


-- BEGIN PGP PUBLIC SIGNATURE --
ajkdg38X3nmfnsa2906NJq ...
-- END PGP PUBLIC SIGNATURE --

or similarly, the encrypted hash used as a signature was generated with 
these tools. I think they might use nonalphanumeric ASCII characters, 
though, so if your requirement is really that it be alphanumeric rather 
than just 7-bit clean then these won't work without modification. Open 
source implementations exist though, and perhaps you can restrict the 
character set in a modified version.

-- 
A fatal exception 0E has occurred at 0028:C0011E36 in VXD VMM(01)
00010E36. The current application will be terminated.

* Press any key to terminate the current application.

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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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