COMP 424 Practice Final

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COMP 424 Practice Final Quiz

Test your knowledge on essential concepts of cybersecurity with our COMP 424 Practice Final Quiz. This quiz covers a wide range of topics including cryptography, buffer overflow vulnerabilities, authentication, and network security.

Prepare for your final exam with questions that delve into:

Encryption methods
Common security threats
System vulnerabilities
Hash functions and their applications

40 Questions10 MinutesCreated by TestingKnight57

What is a disadvantage of using Shift Cipher?

An attacker can find K by using brute force (key space is small)

It is vulnerable due to frequency analysis

Each letter in a ciphertext corresponds to only one letter in the plaintext letter

Adversary can have full control over the communication channel

Which is NOT a type of buffer overflow?

Stack

Heap

TOCTTOU

Return-to-libc

What security goal/property is violated when it comes to email phishing/malware attacks?

How do you break a Mono-alphabetic Substitution Cipher?

What is an advantage/disadvantage of using shift cipher?

Easy to use/Can be easily broken by attacker

Exhaustive search is difficult/Vulnerable to frequency analysis attacks

Secure if key length is equal to cipher text/ Can be broken by Kasisky test

Mathematically unbreakable encryption/Single use only

Which does NOT describe the Vignere Cipher?

Any message encrypted by a Vigenere cipher is a collection of as many shift ciphers as there are letters in the key.

It masks the frequency with which a character appears in a language

Should never be reused

Can find length through Kasisky test

Which rule can be broken for One-Time Pad to still be unbreakable?

The key is truly random

Each key is used only once (must be destroyed after use)

The key is at least as long as the message that must be encrypted

Key space size must be between [0-25]

In a Stream Cipher, what is the term that can be combined with the plaintext digits in a similar fashion to OTP

Which is NOT a relevant hash function?

MD5

SHA1

SHA2

SHA5

What is the name for the brute force attack that requires the length of hash outputs to be double the key length of block ciphers (Ex: If 128, then 256)

How long does it take to brute force the level of security (for collision resistance) of a hash function that outputs n bits?

Which is NOT true about Message Authentication Code (MAC)?

Is a hash family, used for message authentication

The sender and the receiver share secret K

To be secure, an adversary shouldn’t be able to come up with (X’,Y’) such that HK(X’)=Y’

Output known as the fingerprint or the message digest

Which public key encryption algorithm is based on the hardness of factoring large numbers?

Which is NOT true about cookies?

Validation shouldn't only be applied to fields that allow users to type in input

Is a name/value pair created by a website to store information on your computer

Used for authenticating, tracking, and maintaining specific information about users

Servers can use cookies to store state on client

Cross Site Scripting can occur when the web applications take user inputs that contain scripts and use them as part of the webpage

True

False

In an SQL Injection, queries intended by the programmer can be “changed” by untrusted user input

True

False

What is the name of the type of prevention where the process is aimed at verifying whether or not the type of input submitted by a user is allowed?

System Mode cannot execute some instructions, disable interrupts, or access memory management units

True

False

Which does NOT define a system call?

Changes processor state from user mode to kernel mode

Arguments are transferred from user space to kernel space

Default situation is lack of access

Guarded gates from user mode (space, land) into kernel mode (space, land)

Which is NOT a principle of fail-safe defaults?

Default situation is lack of access

Accessing a file identified by a path name requires execution to all directories along the path

Base access decisions on permission rather than exclusion

Protection scheme identifies conditions under which access is permitted

Every program and every user of the system should operate using the least set of privileges necessary to complete the job

True

False

Which is NOT a reason for why buffer overflow happens?

Misconfiguration of environment variables

Programming languages give users too much control

Users do not write safe code

Programming languages have unsafe functions

In a buffer overflow attack, suppose that the buffer that you will overflow starts at [rbp-0x10], which is 16 bytes. If the machine uses an x86-64 CPU, how many bytes do you need to fill up to and including a 48-bit return address in the called function's stack frame?

What countermeasure must be deactivated to perform a buffer overflow attack?

A virtual machine is less secure than a container

True

False

Which is NOT a Security Threat / Attack?

Normal Flow

Interception

Indentation

Fabrication

Which passive attack is described as the reading of messages from sender to receiver by an attacker?

Traffic analysis is a passive attack that observes patterns of a messages from sender to receiver

True

False

Which is NOT an active attack?

Masquerade

Replay

Denial of Service

Eavesdropping

Fill in the blank: Firewalls may be used to create multiple ___ ___ ___, such as a hierarchy .

Firewalls filter based on IP, TCP, and UDP information, among other things.

True

False

Packet Sniffing: What kind of information would be most useful to a malicious user?

Which is NOT a way to protect yourself against packet sniffing?

SSH

HTTP over SSL

Telnet

IPSec

The purpose of a Denial of Service attack is to make a network service unusable, usually by overloading the server or network

True

False

What is the security at the Application Layer?

PGP, Kerberos, SSH

TLS

IPSec

Hardware Encryption

What is the security at the Transport Layer?

PGP, Kerberos, SSH

TLS

Hardware Encyption

IPSec

What is the security at the Network Layer

PGP, Kerberos, SSH

IPSec

TLS

Hardware Encryption

What is the security at the Data Link Layer?

Hardware Encryption

IPSec

TLS

PGP. Kerberos, SSH

Pretty Good Privacy (PGP) works by encrypting a message using a public key that's tied to a specific user; when that user receives the message, they use a private key that's known only to them to decrypt it.

True

False

This IPSec member achieves data confidentiality by using symmetric key encryption algorithms to encrypt packets

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COMP 424 Practice Final

COMP 424 Practice Final Quiz

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