Developed at the Information Sciences Institute of the University of Southern California. Registered users may write checks to other registered users through e-mail or other network protocols. When the check is deposited, it authorizes the transfer of funds from the issuer’s account to the receiver’s account. All information is kept on a netcheque server, which is responsible for keeping accounts for customers, approving payments, and making the necessary changes in client accounts. Security wise, Netcheque uses Kerberos for signature authentication, and it uses conventional cryptography, not public key cryptography.