Consider the following scenario:
Samkin wants to send a private message to Harry but the problem is, they don\’t know the confidentiality and the authentication rule. Help them by selecting the right choice for confidentiality and authentication.

  1. If Samkin is encrypting with Harry\’s public key and Harry is decrypting with its own private key.
  2. If Samkin is encrypting with its own private key and Harry is decrypting with the Samkin public key.

(A) Statement 1 will provide Authentication and Statement 2 will provide confidentiality.
(B) Statement 1 will provide confidentiality and Statement 2 will provide Authentication.
(C) Statement 1 will provide confidentiality but statement 2 is incorrect and will provide nothing.
(D) Statement 2 will provide Authentication but statement 1 is incorrect and will provide nothing.


Answer: (B)

Explanation: Since, Confidentiality is in place to make sure no one else can see the information. So, if the sender is encrypting with receiver\’s public key and Harry is decrypting with its own private key. Then it will provide confidentiality.

And since,Authentication is the process of proving you are who you say you are. So, if the sender is encrypting with its own private key and receiver is decrypting with the sender public key. Then it will provide authentication.

So, option (B) is correct.

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  • Last Updated : 01 Nov, 2018

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