Abstract: Authentication and verification of the integrity of multimedia content delivered from a server to a client through a computer network, such as the Internet, provides a substantial reduction in the possibility of inaccurate and/or unintended content being displayed to a user. Each content file stored on the server is cryptographically registered and such registration information is stored on the server along with the corresponding file name. A user is provided with a second (e.g., public) key corresponding to a first (e.g., private) key used to cryptographically register the content files.