E-mail (electronic mail),
Allows the user to send and receive messages from one computer to another over any distance.,
Encryption is the conversion of data into a form, called a ciphertext , that cannot be easily understood by unauthorized people. Decryption is the process of converting encrypted data back into its original form, so it can be understood.
Equity of access means that all people have the information they need-regardless of age, education, ethnicity, language, income, physical limitations or geographic barriers.
(taken from ALA)