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Editorial Team
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Asked: 2026-05-23T15:05:06+00:00

I’m trying to create this kind of system: a user writes a mail with

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I’m trying to create this kind of system:

  • a user writes a mail with confidential data in it
  • I manage them with PHP, sending them to the administrator
  • only administrator should be able to open that mail

Achieving this seems to be possible this way:

  • encrypt the mail using an Outlook Express-compatible encryption (DES, 3DES, RC” (various bit)) with PHP and an asymmetric pubblic key.
  • decrypt the mail using Outlook Express with an account that owns the asymmetric private key

However, I totally don’t know what kind of certificate should I use, how to get it (I’d like to get at least a free one to do some testing) and I’m not sure this infrastructure would work.

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  1. Editorial Team

    You can use PGP for this. It’s more or less the standard of encrypting mails and there is a free open source utility for the server side of things. In the client, your users will have to install a plugin of which there are several to pick from.

    I don’t know of any native bindings of GnuPG for php, but you can execute it over the command line, using shell_exec

    Update: Looks like someone even wrote a tutorial on this: http://devzone.zend.com/article/1265

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