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Unit 12
Unit 12
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Questions
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Answers
1
In asymmetric encryption, how many keys are used?
Multiple keys for each transaction
Two keys: one for encryption and one for decryption
One key for encryption
Three keys for encryption
2
Which of the following is an example of asymmetric encryption?
RSA
Blowfish
AES
DES
3
What is the Diffie-Hellman Key Exchange used for?
To encrypt and decrypt messages
To create public/private key pairs
To generate a shared secret key between two parties
To sign digital certificates
4
What is a common method for cracking hashes?
Brute force attack
Using rainbow tables
Decrypting the hash
Using public keys
5
Which of the following best describes the nature of a hash function?
It is reversible
It generates the same output for the same input
It produces random results
It requires a private key for encryption
6
Which tool can be used to verify the hash of a file?
Wireshark
Metasploit
HashCalc
OpenSSL
7
What does TLS/SSL provide in secure communications?
Peer-to-peer encryption
Data encryption and server authentication
File integrity and non-repudiation
File compression and authentication
8
What is the main purpose of Public Key Infrastructure (PKI)?
To prevent unauthorized access to systems
To manage encryption keys and digital certificates
To ensure privacy during file transfers
To provide physical security for networks
9
How is a hash typically found in a given file?
By using a decryption algorithm
By matching it to a key pair
By applying a hash function to the file
By using a brute force attack
10
Which of the following is supported by John the Ripper for hash cracking?
AES
SSL certificates
RSA
SHA-256
11
What is the key characteristic of symmetric encryption?
It is slower than asymmetric encryption
It is used only in hashing
The same key is used for both encryption and decryption
It uses two different keys for encryption and decryption
12
What is OpenSSL primarily used for?
Encrypting files using symmetric algorithms
Storing encryption keys
Analyzing encrypted data
Creating SSL/TLS certificates
13
Which of the following is an example of a symmetric encryption algorithm?
ElGamal
AES
Diffie-Hellman
RSA
14
Diffie-Hellman is primarily used in which kind of encryption?
Digital signatures
Hashing
Asymmetric encryption
Symmetric encryption
15
What is the main purpose of hashing in cybersecurity?
To encrypt data
To authenticate users
To generate a unique fingerprint for data
To generate keys for encryption
16
What is a common use case for John the Ripper?
Cracking password hashes
Encrypting sensitive data
Cracking encrypted disk drives
Signing digital certificates
17
What is one way to prevent hash cracking?
Use faster algorithms
Use salted hashes
Use longer hashes
Use multiple hash algorithms
18
What is John the Ripper used for?
Cracking encrypted files
Encrypting data
Generating hash values
Cracking password hashes
19
Which of the following is a commonly used hashing algorithm?
AES
SHA-256
Blowfish
RSA
20
What is a rainbow table used for?
Creating public keys
Validating digital certificates
Cracking hash values
Encrypting data
21
How can John the Ripper speed up hash cracking?
By targeting weak encryption keys
By shortening the hash length
By using a dictionary with common passwords
By using optimized algorithms and hardware acceleration
22
How can the effectiveness of rainbow tables be reduced?
Using more complex algorithms
Using salt in the hash process
Using symmetric encryption
Using larger keys
23
What is the use of prefixes in hashing?
To make the hash function irreversible
To create unique hash values
To increase the speed of hashing
To prevent rainbow table attacks
24
What type of attack does John the Ripper primarily perform?
Man-in-the-middle attack
Replay attack
Brute force attack
Phishing attack
25
Which of the following is commonly added as a prefix to hashes for security purposes?
Salt
Signature
Timestamp
Public key
26
What is the purpose of a CSR?
To request a certificate from a certificate authority
To encrypt data for transmission
To store encryption keys securely
To verify the identity of the certificate authority
27
What is a major disadvantage of using rainbow tables?
They slow down the system significantly
They are used for encrypting data
They require large storage capacity
They can only crack simple hashes
28
Which of the following is required to generate a CSR?
Public key and private key pair
Secret encryption key
None of the above
Digital signature from a certificate authority
29
How does a prefix affect the hash result?
It reduces the size of the output hash
It makes the hash function faster
It changes the output for the same input
It ensures hash collisions
30
What happens if two different inputs produce the same hash value?
The hash value is considered invalid
The inputs are considered the same
The hash function is considered weak
The hash function is perfect
31
What is the main disadvantage of symmetric encryption?
It is slower than asymmetric encryption
It cannot be used for large files
Key distribution can be a challenge
It is insecure
32
Which of the following protocols uses SSL/TLS to secure communications?
HTTP
HTTPS
SSH
FTP
33
What is the primary advantage of asymmetric encryption over symmetric encryption?
It can encrypt large files more efficiently
It enables secure communication without sharing a secret key
It is faster
It uses only one key
34
Which of the following is a limitation of the Diffie-Hellman key exchange?
It is vulnerable to man-in-the-middle attacks without authentication
It is slow and inefficient
It does not work with large data sets
It cannot be used in real-time communications
35
What does CSR stand for in asymmetric encryption?
Certified Security Resource
Cryptographic Secure Request
Cryptographic Signature Record
Certificate Signing Request
36
Which of the following is a feature of John the Ripper?
It supports parallel processing
It is only available on Linux
It does not support salted hashes
It requires a private key for cracking
37
OpenSSL supports which of the following symmetric encryption algorithms?
Diffie-Hellman
ECC
RSA
AES
38
Which type of attack involves trying every possible combination to crack a hash?
Replay attack
Brute force attack
Phishing attack
Man-in-the-middle attack
