Public key infrastructure (Computer security) Computer networks 18 Security measures 18 Computer security 15 Data encryption (Computer science) 6 Java (Computer program language) 5 Public key cryptography 4 Cryptography 3 Data protection 3 Electronic commerce 3 Web services 3 Authentication 2 Business enterprises 2 Chiffrement (Informatique) 2 Computer network protocols 2 Public-key cryptography 2 Quantum computers 2 Computer science 1 Data transmission systems 1 Identification 1