UNITED STATES POSTAL SERVICE

Class [045]
Personal & Legal & Social Services

Applying electronic date and time and digital signature to electronic documents and transactions to verify [ time and date received and ] that documents and transactions have not been altered after application of digital signature; providing authentication of identity for electronic communications; [issuance and management of digital certificates for authentication of encryption of a digital communication, or authentication of a digital signature in an electronic transaction or communication over a global signature in an electronic transaction or communication over a global computer network or other computer network;] [ applying electronic date and time stamp to electronic documents, communications and/or transactions to verify time and date received; ] applying digital signature to electronic documents, communications and/or transactions to verify that the documents, communications or transactions have not been altered after application of digital signature providing proof of receipt of electronic documents, communications or transactions; security printing, namely, encoding identification information on valuable documents and products