Security very easy
If you don't know what PGP is, you will find some information about security and pgp here:
http://en.wikipedia.org/wiki/Pretty_Good_Privacy
Key download
thomasgersdorf @ student.ethz.ch
thomasgersdorf @ gmx.net
PGP key for thomasgersdorf(insert_at_here)gmx.net
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.0.10
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=pieb
-----END PGP PUBLIC KEY BLOCK-----
PGP key for thomasgersdorf(insert_at_here)student.ethz.ch
-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: SKS 1.0.10
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=pieb
-----END PGP PUBLIC KEY BLOCK-----