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WorksheetsIAS2_MIDTERM_EXAM_ 2ND_SEMESTER_SY.24_25
Total questions: 60
Worksheet time: 30mins
What is the primary purpose of cryptography?
To make data transmission faster
To transform data into an unreadable format for security
To increase internet speed
To create complex passwords
Which of the following best defines "Computer Security"?
Measures to protect data during transmission
Generic name for tools designed to protect data and thwart hackers
Protection of data over interconnected networks
None of the above
Which security service ensures that only authorized parties can read transmitted information?
Authentication
Integrity
Confidentiality
Availability
What does "Encipher" mean in cryptography?
The process of converting ciphertext back to plaintext
The process of converting plaintext into ciphertext
The study of breaking encryption
A form of internet security
What distinguishes symmetric-key encryption from public-key encryption?
Symmetric-key encryption uses the same key for both encryption and decryption
Public-key encryption uses only one key
Symmetric-key encryption requires two separate keys
Public-key encryption is not used for secure communications
What is an example of a passive attack?
Masquerade attack
Modification of messages
Eavesdropping on network traffic
Denial of Service attack
Which type of attack involves inserting counterfeit objects into a system?
Interruption
Interception
Modification
Fabrication
What is steganography primarily used for?
Encrypting messages to make them unreadable
Hiding the existence of a message within another medium
Creating strong passwords
Preventing Denial of Service attacks
Which security mechanism is primarily used to detect, prevent, or recover from security attacks?
Security attack
Security service
Security mechanism
Security encryption
What is a major drawback of steganography?
It is easy to detect by attackers
It requires a large amount of overhead to hide small amounts of data
It cannot be used in digital communications
It replaces encryption entirely
What are the two inherent needs that led to cryptography?
To share information publicly and store data
To communicate and share information, and to communicate selectively
To store data and protect computer networks
To develop encryption keys and secure databases
What does the word ‘cryptography’ mean?
Hidden communication
Secure encryption
Hidden writing
Data protection
Which of the following is NOT a primary objective of cryptography?
Confidentiality
Data compression
Integrity
Authentication
Which cryptographic technique uses a shared key for both encryption and decryption?
Asymmetric-key cryptography
Public-key cryptography
Symmetric-key cryptography
Hash functions
What is the main advantage of public-key cryptography?
It uses a single key for encryption and decryption
It does not require key management
It uses different keys for encryption and decryption
It is faster than symmetric-key cryptography
Which of the following is NOT an application of cryptography?
Digital currencies
Computer passwords
Data compression
E-commerce transactions
Which cryptographic technique does NOT use a key?
Symmetric-key cryptography
Public-key cryptography
Hash functions
Hybrid encryption
What is the purpose of a hash function in cryptography?
To encrypt and decrypt messages
To create a fixed-length output that represents input data
To generate public and private keys
To securely exchange encryption keys
Why is web security important?
It prevents unauthorized access to websites and applications
It makes websites load faster
It improves website design
It removes ads from websites
What organization provides security standards for web applications?
ISO
IEEE
OWASP
W3C
Which of the following is NOT a common web security threat?
SQL injection
Data breach
Password breach
Data compression
What is the purpose of a web application firewall (WAF)?
To protect websites from automated cyberattacks
To improve internet speed
To scan websites for errors
To filter unwanted ads
Which of the following is a method of testing web security?
Black box testing
Code minification
Data compression
Web hosting
What is a key function of a Public Key Infrastructure (PKI)?
Managing digital certificates and encryption keys
Speeding up internet connections
Compressing large files
Encrypting Wi-Fi signals
Which entity issues digital certificates in a PKI system?
Internet Service Provider (ISP)
Certificate Authority (CA)
Domain Name System (DNS)
Web hosting provider
What is an example of an attack that web security aims to prevent?
Remote file inclusion
Cloud storage
Data backup
Software licensing
What is a common feature of a secure website?
The presence of a CAPTCHA system
The use of an HTTP URL
An SSL/TLS certificate with HTTPS
A high-resolution logo
What does a security scanner do?
Detects vulnerabilities in web applications
Creates new encryption keys
Compresses web files for storage
Manages digital certificates
Which type of cyberattack tricks users into providing sensitive information?
SQL injection
Phishing
Remote code execution
Password hashing
What is a key benefit of web scanning solutions?
They detect vulnerabilities before security is breached
They improve website aesthetics
They increase web server speeds
They reduce website file sizes
What is the primary function of a firewall?
To provide internet access
To filter access to a protected network
To increase network speed
To store network logs
Which of the following is not a general feature of a firewall?
Port control
Data encryption
Network Address Translation
Wireless signal boosting
What is the purpose of packet filtering in firewalls?
To allow or block network traffic based on predefined rules
To establish a direct connection between networks
To encrypt all network traffic
To manage firewall hardware components
Which type of firewall acts as an intermediary between users and the internet?
Packet filtering firewall
Application-level gateway
Circuit-level gateway
Bastion host
What is a limitation of a firewall?
It cannot prevent direct access to the internet
It cannot scan files for viruses
It always allows incoming traffic
It replaces all security measures in a network
A bastion host is primarily used to:
Store sensitive data outside the firewall
Withstand network attacks and provide secure access
Block all incoming network traffic
Increase internet speed
What does NAT (Network Address Translation) do in a firewall?
Changes the MAC address of packets
Converts private IP addresses to public IP addresses and vice versa
Encrypts outgoing network traffic
Filters malicious websites
In a dual-homed bastion host firewall, how many network interfaces does the bastion host have?
One
Two
Three
Four
Which firewall configuration involves using two packet filtering routers?
Screened host firewall, single-homed
Screened host firewall, dual-homed
Screened subnet firewall
Direct-access firewall
Why is an application-level gateway considered more secure than a packet filtering firewall?
It blocks all network traffic
It encrypts all data packets
It inspects and controls specific applications
It only allows outbound connections
What is the primary purpose of cryptography?
To store large amounts of data
To improve network speed
To secure data through encryption and decryption
To compress files
What is plaintext in cryptography?
Encrypted text
A key used for encryption
The original readable message
A special type of cipher
What is the process of converting plaintext into an unreadable format called?
Decryption
Encryption
Cryptanalysis
Hashing
Which ancient cryptographic technique involved shifting letters in the alphabet?
Vigenère Cipher
Playfair Cipher
Caesar Cipher
AES Encryption
What is the function of a cipher in cryptography?
To analyze security threats
To break encrypted messages
To perform encryption and decryption
To create user passwords
What type of cryptography uses the same key for both encryption and decryption?
Asymmetric Key Cryptography
Hash Functions
Public Key Infrastructure
Symmetric Key Cryptography
Which of the following is a widely used symmetric key encryption algorithm?
RSA
AES
Diffie-Hellman
MD5
What does a hash function do?
Encrypts messages for secure transmission
Converts data into a fixed-length output
Stores encryption keys
Generates new passwords
Why is key management a challenge in symmetric cryptography?
The keys are too large to store
Keys must be securely exchanged and kept secret
The keys can only be used once
Only public keys are needed
Which cryptographic method is often used to store passwords securely?
Symmetric Encryption
Asymmetric Encryption
Hashing
Plaintext Storage
(a) is the art or science of transforming an intelligible message into an unintelligible form and back again.
A (a) is an algorithm used for transforming an intelligible message into one that is unintelligible by transposition and/or substitution methods.
The three primary aspects of information security are ______, ______, and ______.
(a)
.A (a) attack occurs when an unauthorized party inserts counterfeit objects into a system
The (a) cipher is named after a Roman emperor and involves shifting letters by a fixed number.
(a) security refers to measures taken to protect data during its transmission
In public-key cryptography, each user has a ______ key for encryption and a ______ key for decryption.
(a)
The process of converting plaintext to ciphertext using a cipher and a key is called (a) .
A (a) is an entity responsible for issuing digital certificates in a public key infrastructure (PKI)
The primary function of a (a) is to filter access between a trusted and an untrusted network
