The GPG Suite for Mac provides everything you need to get started with secure communication and encrypting files in one simple package. While no longer free unless you compile the code yourself, it is still worth the cost ($24 per major relase) untill Apple builds encryption into Mac Mail.
Use GPG Suite to encrypt, decrypt, sign and verify files or messages. Manage your GPG Keychain with a few simple clicks and experience the full power of GPG without too much hassle.
One shouldn't need to set up sophisticated encryption tools to protect their private mail, documents and records. Amendment IV to the U. S,. Constitution reads:
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no warrants shall issue, but upon probable cause, supported by oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.