a) If a n1essage sender uses SSL/TLS when it sends a message, how is protection likely to be limited? b) Distinguish between link encryption and endto- end encryption for confid entiality. c) Why is...

a) If a n1essage sender uses SSL/TLS when it sends a message, how is protection likely to be limited? b) Distinguish between link encryption and endto- end encryption for confid entiality. c) Why is link-by-link encryption for confidentiality not fully secure even if there is encryption for confidentiality in all links along the way? d) What is the remedy for the limitations of link-by-link encryption? e) Why is end-to-end encryption uncon1mon?