Cryptosystems and protocols: Cryptosystem is a method used to hide data from the unauthorized access and the protocols are used to ensure the security of the system at the time of transaction and sharing details. Most popular cryptosystem and protocols are TLS/SSL and HTTPS.

Question

What is the difference between network applications and application layer protocols? Both HTTP and FTP can be used for downloading and uploading files. Give one similarity and one difference between the two protocols. What is the purpose of the IF-MODIFIED-SINCE field in an HTTP GET message?

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Question

Chapter 8, Problem 2E

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Cryptosystems and protocols:

Cryptosystem is a method used to hide data from the unauthorized access and the protocols are used to ensure the security of the system at the time of transaction and sharing details. Most popular cryptosystem and protocols are TLS/SSL and HTTPS.

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