Why not set up some kind of public/private key system? Each customer has a 
public key that you can encrypt with, send them the data and have them 
decrypt it with their private key. 

PGP would be the obvious choice, or GnuPG for that matter.


Geoff Caplan wrote:

> Hi folks,
> Bit OT but I am hoping someone on the list can help.
> I need to encrypt short strings in PHP, using mcrypt by preference,
> email it to the customer, and have him decrypt the string on the
> Windoze desktop.
> But all the Windows encryption utilities I can find use proprietary
> file formats - none can decrypt the string output by mcrypt. Can
> anyone help me out here - I am running out of time. Either an open
> source or a commercial solution would be fine.

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