b) Discuss on the following cryptographic tools. (i) Public-Key Infrastructure (PKI)  (ii) Digital Signature  (iii) Digital certificates  (iv) Steganography.

Database System Concepts
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ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Chapter1: Introduction
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b) Discuss on the following cryptographic tools.
(i) Public-Key Infrastructure (PKI) 
(ii) Digital Signature 
(iii) Digital certificates 
(iv) Steganography. 

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