Sometimes email contains sensitive data which must be encrypted. You can handle this two ways, manually encrypt the data or use an exceptional Thunderbird Extension called Enigmail. This extension uses gpg and makes the encryption/decryption as user-friendly as it gets. With keys installed in Enigmail (either manually or from a keyserver) encrypted email is automatically [...]
Secure your files: An introduction to GnuPG
GnuPG allows you to encrypt data so only the intended recipient, with a key and a password, can decrypt it. It also provides a mechanism for verifying data is from the person who has claimed to send it. GnuPG can also provide a way for you to securely prevent your files from being opened without [...]
Cryptography Tutorial
This is a very informative site that explains many cryptography concepts. He begins by defining cryptography as “the science of writing in secret code and is an ancient art” and mentions that the first documented use of dates back to 1900 BC Egypt.
After that he explains why cryptography is essential for todays internet communication: “cryptography is necessary when communicating over any untrusted medium, which includes just about any network, particularly the Internet.”
