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CRYPTOGRAPHY AND NETWORK SECURITY – Q&A
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CRYPTOGRAPHY AND NETWORK SECURITY – Q&A
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CRYPTOGRAPHY AND NETWORK SECURITY – Q&ACryptography ✔️Ans - The art or science that encompasses the principles
and methods of transforming an intelligible message into one that is
unintelligible, and then retransforming that message back to its original
form.
Network Security ✔️Ans - Measures to protect data during their
transmission
The 3 OSI Security Architecture ✔️Ans - 1. Security Attacks
2. Security Services
3. Security Mechanisms
Security Attacks ✔️Ans - Any action that compromises the security of
information owned by an organization.
2 categories of Security Attacks ✔️Ans - 1. Passive Attacks
2. Active Attacks
Passive Attacks ✔️Ans - Attempts to learn or make use of information
from the system but do not affect system resources. It involves
eavesdropping or monitoring data transmission.
2 types of Passive Attacks ✔️Ans - 1. Release of Message Contents
2. Traffic Analysis
Release of Message Contents ✔️Ans - Trying to access or reveal the secret
content with a message
Traffic Analysis ✔️Ans - Involves studying data transmission patterns to
uncover the location, identity of communicating hosts, and message
frequency and length. This helps guess the nature of communication
without accessing message content
Active Attacks ✔️Ans - Attempts to alter system resources or affect their
operation.
, 4 different types of Active Attacks ✔️Ans - 1. Masquerade
2. Replay
3. Modification of messages
4. Denial of service
Masquerade ✔️Ans - It takes place when one entity pretends to be a
different entity
Replay ✔️Ans - involves the passive capture of a data unit and its
subsequent retransmission to produce an unauthorized effect
Modification of messages ✔️Ans - It means that some portion of a
legitimate message is altered, or that messages are delayed or reordered, to
produce an unauthorized effect.
Denial of service ✔️Ans - It prevents or inhibits the normal use or
management of communications facilities. This attack may have a specific
target. Another form of service denial is the disruption of an entire
network, either by disabling the network or by overloading it with
messages to degrade performance.
Detection Difficulty ✔️Ans - Passive: Hard to detect, as they don't alter
data.
Active: Easier to detect due to changes or disruptions.
Prevention Focus ✔️Ans - Passive: Prevention-focused, often using
encryption to secure data.
Active: Prevention is challenging due to various vulnerabilities, so focus is
on detection and recovery
Awareness of Parties ✔️Ans - Passive: Usually go unnoticed by both
sender and receiver.
Active: The sender or receiver may notice unusual activity, delays, or
disruptions, making them aware of the attack.
Variability ✔️Ans - Passive: Have a consistent pattern of eavesdropping or
monitoring
Active: Take various forms, including physical, software, or network based
methods.
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