This is achieved by converting the file into an encrypted ZIP file using the free Windows tool called "7-Zip". The University of Reading have opted, for now, to use the simplest and most compatible method which is also free to use. There are several methods available to encrypt a file. It is critically important that the key is not sent by the same method as the attachment, as then the prying onlookers would have both the file and the means to unlock it. One way of ensuring that only the sender and recipient can read an attachment is to encrypt it, passing the special key via a different channel, e.g. There is usually no way of ensuring that the entire path from the sender to the recipient is safe and free from prying onlookers who could intercept the attachment and make their own copy. Sometimes you may be required to send sensitive information to another party as an email attachment. Encryption is a method of scrambling or locking the contents of a file so that only intended recipients can read it by unlocking the file with a special key, which is often a password but the key can also be a private file which only the intended recipient holds.
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