Assume in each of the following cases, Ahmed sends a single message to Khaldoon. Assume further that Ahmed's and Khaldoon's public keys have been securely distributed between each other. The required properties of this communication are to support Confidentiality, Integrity, Authentication, and Non-repudiation. For each of the following message dispatching case, Explain in detail which of the above security properties will hold. If none of the properties hold, simply write None. You MUST Justify your answer. Assume the following notations: AHPU denotes Ahmed's public key AHPR denotes Ahmed's private key KHPU denotes Khaldoon's public key KHPR denotes Khaldoon's private key H denotes a secure hash function M denotes Message || denotes concatenation E denotes encryption Case 1: Ahmed sends a message to Khaldoon as follows: E( M, KHPU ) Case 2: Ahmed sends a message to Khaldoon as follows: E( M, KHPR ) Case 3: Ahmed sends a message to Khaldoon as follows: E( ( M|| E(H(M),KHPU) ), AHPR ) Case 4: Ahmed sends a message to Khaldoon as follows: E( ( E(M, AHPR) || E(H(M),AHPU) ), AHPR )

Assume in each of the following cases, Ahmed sends a single message to Khaldoon. Assume further that Ahmed's and Khaldoon's public keys have been securely distributed between each other. The required properties of this communication are to support Confidentiality, Integrity, Authentication, and Non-repudiation. For each of the following message dispatching case, Explain in detail which of the above security properties will hold. If none of the properties hold, simply write None. You MUST Justify your answer. Assume the following notations: AHPU denotes Ahmed's public key AHPR denotes Ahmed's private key KHPU denotes Khaldoon's public key KHPR denotes Khaldoon's private key H denotes a secure hash function M denotes Message || denotes concatenation E denotes encryption Case 1: Ahmed sends a message to Khaldoon as follows: E( M, KHPU ) Case 2: Ahmed sends a message to Khaldoon as follows: E( M, KHPR ) Case 3: Ahmed sends a message to Khaldoon as follows: E( ( M|| E(H(M),KHPU) ), AHPR ) Case 4: Ahmed sends a message to Khaldoon as follows: E( ( E(M, AHPR) || E(H(M),AHPU) ), AHPR )

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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