Which of the following ensures confidentiality of information sent over the internet?

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Which of the following ensures confidentiality of information sent over the internet?

A.
Digital signature

B.
Digital certificate

C.
Online Certificate Status Protocol

D.
Private key cryptosystem

Explanation:
Confidentiality is assured by a private key cryptosystem. Digital signatures assure data integrity,
authentication and nonrepudiation, but not confidentially. A digital certificate is a certificate that
uses a digital signature to bind together a public key with an identity; therefore, it does not address
confidentiality. Online Certificate Status Protocol (OCSP) is an Internet protocol used for obtaining
the revocation status of a digital certificate.

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