GNU Privacy Guard

Here's my public key, for anyone sending encrypted emails:

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v1.2.3 (Darwin)

mQGiBD+RTp8RBACia2ewACPKwye0BUHin6Hw4DnI9uJAUX39h2oOKwBM7kefSBKR A69JSDvwl+jAW2KfKJoN/f4LEb6bR7O9LJc+mcqhf4chCrRwDbnAuW+hRhpaWJxP SeYBKHnTNUaaRc9wO9bmpF3DjG3KMmMkqMZgV3nFQEGvP7doh5DcuN+29wCg/xOT 2415S3HusQQjRFbDH63g+iUD/R9CSz0mEFkvwIHXpXSPPp37cUDQ1nuiNZj6wB4q M4XUOmFeicwXPbbfBzxJ/BSEDPnai2xuicG0g4sjlFz/gDPvqpzmzqTMOIzjr/su 4A3Fhv4koW4CZuoRUr7UUwoiIVGVf3GH6ujdsx2VeGg9iJMH0fed4bgXvwV8+8KI UBuSA/wKj80Ev3m4tq7LXDrGVFipnam685zNqa2SJPwmmNS5SkzZ3QZ+y2msH+4O 4uHtlTCglqDmjd0kiyHtSTGOMv78caEvNp5D3x4243OzReQ8lLFrjR9Ar4IRr5C+ DFYbrtvv83YoTt+ZGBgIev31YOviOJkZKS553YnbnDvMXiPQfLQkQWxmIEVhdG9u IChHbnVQRykgPGFAcG1icm93c2VyLmluZm8+iF4EExECAB4FAj+RTp8CGwMGCwkI BwMCAxUCAwMWAgECHgECF4AACgkQ2nvAnDeoQDvduQCg+9ZxJDeK1nSP4+l7Ga7J oAmRZqsAn0F2pCbd05ve0GA/+j49JElIRRvCuQINBD+RTsoQCACFxIN0VFUxiTV+ eWDRIv4m2ISM0J0wctxpjmMUKlb9wZO4iAXyWe4oApNEd9sEPgh586Pd8Cesvc2W KnanrZbRbC6WZV53o6IxJRomUVDe8Ov3Z590uHFaGOigE+T3vO0d+Q6Va1GZRpew UZuO4Dgzj40cw42sJA0+vzpNak3aDZKBl60xGPlEKAP6mNx+odnqj1cyO2oJBhA/ oUxqb8tAVJIrrVWxPjviRv2o9ukQdt3qvk095V0Wqiy5Pv8SF/+AjyRzUoF5lyVN Ayrfz3tQt7+5OnUSN8n58pGH26EjZxAeFESYSZqH2b/OWZyFBw3y82FT75GRucwJ ItnDARo7AAMGB/48RLDxRy6poj17EJOc5Z8mWcuYwLeIPW/sWCUzsJef2s0J9kKm nN/BKLITUs13mmS08wi5zDG0OR0PuMOZmvwdEk1OtGiOrkIlTC22Frmvs8w41eSm JHU0Jn0MluMeA/Mg0EmrOmed/lWdltdTWAEhdCwy5AgaJ0kdwtlPrP8ImR82cp79 pMOXxVhJMAuiwt0SsFQ4ARtOf1SEYRcN54lpWrq61r6fYOKy+dpXXyShSf7nSbNT GmLgDDaMOMI+dFn9mLn3pjUTn3ZoKUxu3z6uPBEIxBa60WmVPO/KFhV9xPxmG3pl yRxGp4wjPjhtoqvRJEuLRMNMPPnvi1glsHsSiEkEGBECAAkFAj+RTsoCGwwACgkQ 2nvAnDeoQDszYACfaCit3R8PREz781ytL+0/ktNfErYAoMRDh1ordZVw2Evv9+hm MLbMUbbt =ZEKZ
-----END PGP PUBLIC KEY BLOCK-----

It was actually really easy to install, all integrated with Apple's Mail, using the instructions on this page.