Define the following protocols, how they work, and give example how and where to implement it.

1. PEM - Privacy Enhanced Mail

2. IPsec - Internet Protocol Security

3. VPN virtual private networks

4. SET- Secure Electronic Transactions

5. DMARC-Domainbased Message Authentication, Reporting and Conformance

6. Terminal Access Controller Access Control System (TACACS+ )

7. Kerberos

8. S/mime - Secure/Multipu rpose Internet Mail Extensions

9. DTLS - Datagram Transport Layer Security

10. PKI public key Infrastructure

11. Digital watermarking and what is blind, semi-blind, non-blind watermarking

12. SSH , SSL/TLS