Enigma, APRANET and MULTICS

1.What is ? How did it work? Use external references to provide all information related to this device. Cite your references using APA format
2.Explain the concept of APRANET and the reason(s) that created the need for this kind of communication? What were some of the security problems identified with such a system? Use external references and cite your references using APA format
3.What is MULTICS? What was the primary goal of creating it? Use external references and cite your references using APA format
4. One of the key Information Security Concepts is Protection Profile or Security posture, what does it mean? How does it work? Use external references and cite your references using APA format
5.What are the Critical Characteristics of information? Define each one of them.