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One of the most effective things you can do is transfer your files using a client the uses SSL encryption. SSL stands for Secure Sockets Layer, and is the most common way to perform a secure file transfer over the internet. Using SSL encryption secures the data as it is being transferred. This ensures you that if someone intercepts your data while it is being transferred, they can not use it because it is encrypted.
Another, more complicated, way of securing your file transfer is to encrypt your file directly using an encryption algorithm. Encryption algorithms use keys to encrypt and decrypt data. Each file recipient has to have the correct encryption key to be able to decrypt the file, making this a secure, but more involved, way of making sure your files are secured.
CheapFTP.com makes file transfer security simple by offering a free web based FTP client. Using the optional SSL encryption option, secure file transfer is a snap. Click here for more information.