iiii.___________accepts a variable-size message M as input and produces a fixed-size message digest H(M). a) Block cipher  b) Stream cipher c) Public key d) Hash Function iv. For the secure exchange of messages with a new entity without a prior arrangement,  which one of the cryptographic entities is useful? a) Block cipher b) MAC c) Asymmetric encryption  d) Hash function.  i. Modifying an encrypted message without understanding its contents will result in issue. • Confidentiality • Availability • Integrity • Repudiation ii. An attacker breaks into your personal computer and deletes some important files is an  example of ___________attack • Ciphertext • Passive • Ransomware • Active iii. _____ accepts a variable-size mes:age M as input and produces a fixed-size message digest H(M). • Block cipher • Public Key encryption • Stream Cipher • Hash-function iv. A

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
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iiii.___________accepts a variable-size message M as input and produces a fixed-size
message digest H(M).
a) Block cipher 
b) Stream cipher
c) Public key
d) Hash Function
iv. For the secure exchange of messages with a new entity without a prior arrangement, 
which one of the cryptographic entities is useful?
a) Block cipher
b) MAC
c) Asymmetric encryption 
d) Hash function. 
i. Modifying an encrypted message without understanding its contents will result in issue.
• Confidentiality
• Availability
• Integrity
• Repudiation
ii. An attacker breaks into your personal computer and deletes some important files is an 
example of ___________attack
• Ciphertext
• Passive
• Ransomware
• Active
iii. _____ accepts a variable-size mes:age M as input and produces a fixed-size message
digest H(M).
• Block cipher
• Public Key encryption
• Stream Cipher
• Hash-function iv. A

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