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Public key encryption/decryption is not preferred because

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in Cryptograph & Network Security by (60.0k points)
Public key encryption/decryption is not preferred because

(a) it is slow

(b) it is hardware/software intensive

(c) it has a high computational load

(d) all of the mentioned

I got this question in an international level competition.

This interesting question is from Public Keys and X.509 Certificates-I topic in portion Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

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Right choice is (d) all of the mentioned

The explanation is: Due to high computational load ( thus being slow ) public key systems are not preferred for large cryptosystems and large networks.

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