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Security and networks IIB Chapter 1
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Chapter 1 of Security and Networks for IIB in English
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Security and Networks, Part 1: Cryptography
V-01 Introduction
Keywords: Information Security, confidentiality, integrity, availability, accountability, non-repudiation,
Transposition, Substitution, Obfuscation, cryptography, Shanon’s Rules
What is information security?
The protection of information from a wide range of threats in order to ensure
business continuity, minimize business risk and maximize return on
investments and business opportunities.
Important aspects of information security:
1. Confidentiality:
- Prevention of unauthorized information
- Restricted data access - only to authorized entities
- Seriousness of disclosure
2. Integrity:
- May refer to systems and/or data
- Users must be confident that the same information can be retrieved
just as it was originally entered and internal system processes work as
expected
- May be compromised due to accidental errors or malicious activities
3. Availability:
- To be accessible and usable on demand by an authorized entity
- Encompasses prevention of unauthorized withholding of information or
resources and safeguards against system failure
- Maintaining availability can be regarded as a quality of service issue
- Seriousness of denial of service generally increases depending upon
the period of unavailability.
4. Accountability:
- Ensurance that actions of an entity may be traced uniquely to that
entity.
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