You can use this key to encrypt files and email so that only I can open them. You'll need to use a cryptographic program such as PGP or GnuPG. PGP is free for non-commercial use, and GnuPG is Free. Depending on what program you use for email, you might be able to plug crypto software into your email system. I'm using Enigmail for Thunderbird, both of which are Free.
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.0.6 (GNU/Linux) Comment: For info see http://www.gnupg.org mQGiBDzfm3wRBACxiDbLtYiNuMeDbGpdclNovZs8XSFOPSusXE6AyNIvq/c+wAtV fI1Xe7Ny9xSCe4yv6mMyg2aA9OPWQa0+iILFjK8DG4GKebCWXjkMvHMY5iWEFjJ/ uf5kdoBlcUnVxPPU6RHyxYbnTGiB2uHbx39cQgsw54zNIk47p/8tEDMR5wCgrhAZ GzJR8IS8l1XlElE5o3Z/qokD/1gNklUHq6Jh3XLSXc1K2bON0+bmYk4Z+SFx8Jj2 c+4BL4CnBnobhEk/2/v6TuyEmFrfIQsl1z7HIJdep44dh2fRwDkmIa/ZtyhtzGlU sD6peY5+czsnUS5LDF8a9vrmGY/MqRYj9o13sl94vtS1fpQXD//d5P8VqGgfnI9m 89XKBACakQkQa6AXewgLWKyY8EQ4RKDbY0w/SgatcL3BuDg0sVayGsuqZxE2jX39 0nLTBASTJV8iMyuht2inK3jtK08mRHm/xJa7Dne4WNou9/AB3tFPc+ULpziDbcrN TL8Bfr95KOXmXsrPQG/i6U8crsVUabs3rr/MoC9pY6Jd4nHAu7QpRGFtb24gUmls ZXkgPGRhbW9ucmlsZXlAYWx1bW5pLnVtYXNzLmVkdT6IVwQTEQIAFwUCPN+bfAUL BwoDBAMVAwIDFgIBAheAAAoJEK/CUj6A3kRPFcUAnRS6C95GIxKugcXZeXdHR4Gd mDEjAJ9on9ERHH4JBtvFplTbyrtAWS4BYLkBDQQ835uGEAQAryywdraznqYBc/AS gy/t8pi1Lztqn3hYtd+EifhbMxTSMssttu86BlHFnmMHlQaSKpA5795shyE/wt8b hRDtFC6Jr7GEOsR1ZVlD9aaM1Tt39zHP2kF/hS0suIWUDB9TT3OkNxT1ssN4CSB1 08RWeVbb8sJE8nToyWxrnzxhfbcAAwUD+gOqaeK4iCofx0YcFt/K8Yd699i/M7tz IcYUVLZasXlc/dJ7U525PG//lKJIoQ4malBH3Vkeeljth9W3KLNTWxhFC9LAUItf rL2UUi0ANJdUAzad5jLbXrr3WA3oXb2Qu5bsKr4uyghuqU96yt74X9feLkJWweHy wn3NSbbJJa2giEYEGBECAAYFAjzfm4YACgkQr8JSPoDeRE/t3ACgg41m2D9Qe+zM c9KptCncXDjNxpQAmgOGlTtfU5m1PMjztj6Q1eGhO8KvmQGiBDzfm3wRBACxiDbL tYiNuMeDbGpdclNovZs8XSFOPSusXE6AyNIvq/c+wAtVfI1Xe7Ny9xSCe4yv6mMy g2aA9OPWQa0+iILFjK8DG4GKebCWXjkMvHMY5iWEFjJ/uf5kdoBlcUnVxPPU6RHy xYbnTGiB2uHbx39cQgsw54zNIk47p/8tEDMR5wCgrhAZGzJR8IS8l1XlElE5o3Z/ qokD/1gNklUHq6Jh3XLSXc1K2bON0+bmYk4Z+SFx8Jj2c+4BL4CnBnobhEk/2/v6 TuyEmFrfIQsl1z7HIJdep44dh2fRwDkmIa/ZtyhtzGlUsD6peY5+czsnUS5LDF8a 9vrmGY/MqRYj9o13sl94vtS1fpQXD//d5P8VqGgfnI9m89XKBACakQkQa6AXewgL WKyY8EQ4RKDbY0w/SgatcL3BuDg0sVayGsuqZxE2jX390nLTBASTJV8iMyuht2in K3jtK08mRHm/xJa7Dne4WNou9/AB3tFPc+ULpziDbcrNTL8Bfr95KOXmXsrPQG/i 6U8crsVUabs3rr/MoC9pY6Jd4nHAu7QpRGFtb24gUmlsZXkgPGRhbW9ucmlsZXlA YWx1bW5pLnVtYXNzLmVkdT6IVwQTEQIAFwUCPN+bfAULBwoDBAMVAwIDFgIBAheA AAoJEK/CUj6A3kRPFcUAnRS6C95GIxKugcXZeXdHR4GdmDEjAJ9on9ERHH4JBtvF plTbyrtAWS4BYLkBDQQ835uGEAQAryywdraznqYBc/ASgy/t8pi1Lztqn3hYtd+E ifhbMxTSMssttu86BlHFnmMHlQaSKpA5795shyE/wt8bhRDtFC6Jr7GEOsR1ZVlD 9aaM1Tt39zHP2kF/hS0suIWUDB9TT3OkNxT1ssN4CSB108RWeVbb8sJE8nToyWxr nzxhfbcAAwUD+gOqaeK4iCofx0YcFt/K8Yd699i/M7tzIcYUVLZasXlc/dJ7U525 PG//lKJIoQ4malBH3Vkeeljth9W3KLNTWxhFC9LAUItfrL2UUi0ANJdUAzad5jLb Xrr3WA3oXb2Qu5bsKr4uyghuqU96yt74X9feLkJWweHywn3NSbbJJa2giEYEGBEC AAYFAjzfm4YACgkQr8JSPoDeRE/t3ACgg41m2D9Qe+zMc9KptCncXDjNxpQAmgOG lTtfU5m1PMjztj6Q1eGhO8Kv =9omu -----END PGP PUBLIC KEY BLOCK-----