Internet News Internet Investing Internet Technology Windows Internet Tech. Once all of the files are virus-free, you will eventually want to transfer them from one location to another. When transferring files electronically, you must consider the security of the data while in transmission. As mentioned before, PGP is a great tool for data encryption on a local hard drive, but it also offers terrific data encryption during transmission. Although this tutorial centers on e-mail encryption, PGP can also be used to encrypt a file, which can then be transferred via FTP or Telnet.
Methods are also available to secure the actual transmission channel.
VPNs use two basic connectivity models. Once authenticated, the client then encrypts its data and sends it to the server, which decrypts it and vice-versa. In Layer 3, the authentication is handled outside the VPN connection. The initial connection authentication is handled via PGP's key-pair. The initiating client enters the passphrase used to sign the PGP key being used for the VPN connection.