а. Екриь(М) b. M| H(K|M) с. М| Н(М) d. Ex(M | H(Kм) e. Екриь(М) | Екрri(H(M))
а. Екриь(М) b. M| H(K|M) с. М| Н(М) d. Ex(M | H(Kм) e. Екриь(М) | Екрri(H(M))
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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Question
Could you, Please solve the fourth question

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Question 4:
Consider the following cryptosystems and determine which security service(s) (e.g.
Authentication, Integrity...etc) they provide where Ek is the encryption
process using the key K, M is the plain message, K is the shared secret key, Kpub is
the public key, Kpriv is the private key and and H is the hash.
а. Екриь (М)
b. M| H(K|M)
с. М| H(М)
d. EK(M | H(K|M)
е. Екриь (М) | Екрriv(H(М))
عرض الكل
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