Answer each topic in at least two paragraphs . Topic 1 : List and briefly discuss categories of security services. Topic 2 : Brief discuss the Playfair cipher. Topic 3 : Discuss how the Data Encryption Standard (DES) works. Topic 4 : Discuss the strength of the Data Encryption Standard (DES). Topic 5 : Briefly discuss the main difference between public key cryptography and DES Topic 6 : Briefly discuss the RSA encryption algorithm. Topic 7 : Briefly discuss, using your own experience, various virtual private networks and various access control approaches. Topic 8 : Briefly discuss secure e-mail communications using cryptographic protocols and secure wireless communications using cryptographic protocols. ...