42 Data encryption; data decryption; authentication of data in the field of cybersecurity banking using blockchain technology; software development, programming and implementation of software, all in the field of authentication of data, information and messages; online authentication services, namely, providing user authentication services using single sign-on technology for online software applications, electronic document and e-mail authentication services; remote online computer backup services, particularly for single sign-on services; online authentication of electronic signatures, namely, electronic signature verification services using technology to authenticate user identity; digital security services for the IT-based security of electronic transactions, namely, providing authentication, issuance, validation and revocation of digital certificates; computer security services for restricting access to and through computer networks to and from websites, media and individuals; computer security services, namely, protecting computers, websites and databases by restricting unauthorized access; computer security services enabling control of access privileges of users to computers, electronic networks, websites and databases based on assigned credentials; digital security of data transmission and transactions over computer networks, namely, computer security threat analysis for protecting data; digital security of access to websites, computers and databases, namely, restricting unauthorized access to websites, computers and databases; backup services for data from computers, smartphones and other mobile IT applications; digital data backup of online transactions; providing online non-downloadable user authentication and identity management software and digitally securing such software; online creation and verification of authentication certificates for electronic signatures, namely, administering digital certificates