[Dovecot] Disk Encryption
jeroen at massar.ch
Wed Mar 27 12:17:02 EET 2013
> Currently my mail store isn't encrypted and I would like to know if
> it is possible to do that, and if so, maybe get some pointers.
There are two main roads:
- filesystem/disk based encryption
* Fast and easy to setup though (eg LUKS on Linux)
* does not protect against a running system being attacked, eg
that they can run custom code in the same security level that
thus can read the unencrypted content.
- per-file encryption, eg with PGP/GnuPG
* Likely more complex to setup/fail-prone
* attacker getting access can only encrypt more mail and/or
of course subvert any new mail, but can't decrypt old.
* there are a couple of tools which enable this, typically it is
a procmail/pipe through gnupg
* Decryption of mails can be done with a "IMAP-proxy" style tool
or possibly better/easier by the mail client.
* Check out:
* Store your decryption keys in a secure/offline place
* "Rubber Hose Crypto": http://www.schlockmercenary.com/2006-03-29
* "Lead Pipe Crypto": http://www.schlockmercenary.com/2009-10-19
Of course it always depends on the attack vectors that you are
protecting against ;)
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