Digital certification and security services, namely, issuance and validation of digital certificates providing authentication of the source of a digital communication, authentication of identity and of a digital signature in an electronic transaction or communication, authentication of identity for physical or logical access control, providing encryption of data; computer consultation in the field of network security and authentication of digital signatures in an electronic transaction or communication; design of computer hardware, software, and specifications used for network security and authentication of digital signatures and identities in an electronic transaction or communication; technical support services, namely, troubleshooting of computer hardware and software problems via telephone, e-mail and in person