42 Providing authentication of identity for electronic communications; issuance and management of digital certificates for authentication or encryption of a digital communication, or authentication of a digital signature in an electronic transaction or communication over a global computer network or other computer networks; technical consultation in the field of issuing and managing of digital certificates; Authentication services, namely, applying electronic date and time stamp to electronic documents, communications and/or transactions to verify time and date received; Authentication services, namely, applying digital signatures to electronic documents, communications and\or transactions to verify that the documents, communications or transactions have not been altered after application of digital signature; Authentication services, namely, providing proof of receipt of electronic documents, communications or transactions; security printing, namely, encoding identification information on valuable documents and products