ISRO2008-59

Question

A public key encryption system

• A. allows anyone to decode the transmissions
• B. allows only the correct sender to decode the data
• C. allows only the correct receiver to decode the data
• D. does not encode the data before transmitting it

Answer 1

In a public-key encryption system, any person can encrypt a message using the public key of the receiver, but such a message can be decrypted only with the receiver's private key.A public key encryption allows only the correct receiver to decode the data because others dont have the private keys.so correct answer is C

https://en.wikipedia.org/wiki/Public-key_cryptography

Answer 2

In a public-key encryption system,Basically any person can do the task of encryption using public key of receiver .

When receiver receive its cipher text ,then only he has private therefore only he can decrypt the CT and convert into PT(Plain text).

Therefore sender can be any one please but receiver will be one that is receiver.

Therefore best option will C.

Answer 3

In public key encryption, the senders encrypt the data using receiver's public key and reciever decrypt the data using its private key. This encryption technique provide the confidentiality.

so, Option C is correct.