WorksheetsCryptography
Total questions: 20
Worksheet time: 10mins
Name
Class
Date
1.
What is the process of turning ciphertext back into plaintext using a key?
a)
Decryption
b)
Encryption
c)
Hashing
d)
Authentication
2.
What is the primary purpose of hashing functions in cryptography?
a)
To encrypt data
b)
To ensure data integrity
c)
To exchange keys securely
d)
To authenticate users
3.
Which encryption method uses a pair of keys, one public and one private, to secure data?
a)
Symmetric encryption
b)
One-time pad encryption
c)
Asymmetric encryption
d)
Two-key encryption
4.
Encryption transforms readable data, known as (a) , into an unreadable format called ciphertext.
5.
In an asymmetric communication between 6 people, how many keys do you need to communicate
(a)
6.
In a private key cryptographic communication, how many keys do you need to communicate between 2 people
(a)
7.
What is the term for the process of transforming plaintext into ciphertext using a cryptographic algorithm?
a)
Decryption
b)
Hashing
c)
Encryption
d)
Authentication
8.
What cryptographic technique guarantees that the information hasn't been altered or modified in transit or storage?
a)
Confidentiality
b)
Hashing
c)
Symmetric encryption
d)
Asymmetric encryption
9.
In the context of asymmetric encryption, what is a public key used for?
a)
Decryption only
b)
Encryption only
c)
Both encryption and decryption
d)
Neither encryption nor decryption
10.
Which of the following is true about symmetric encryption?
a)
It uses different keys for encryption and decryption.
b)
It is primarily used for data in transit.
c)
Both parties use the same key for encryption and decryption.
d)
It is more suitable for scenarios where key distribution is not an issue.
11.
Which tool is used to extract hashes from ZIP files for password cracking?
a)
OpenSSL
b)
SHA-256
c)
zip2john
d)
John the Ripper
12.
Steganography is primarily used for:
a)
Data compression
b)
Data encryption
c)
Data concealment
d)
Data authentication
13.
Which feature distinguishes steganography from encryption and hashing?
a)
Reversibility
b)
Collision resistance
c)
Irreversibility
d)
Detectability
14.
Which of the following statements is NOT true about hashing functions?
a)
They always produce an output of the same length.
b)
They are one-way functions, meaning you cannot retrieve the original data from the hash.
c)
They can be used to verify the integrity of data.
d)
They are used to encrypt sensitive information.
15.
A collision in hashing occurs when:
a)
Two different inputs produce the same hash value.
b)
The hash function is too slow.
c)
The output of the hash function is too long.
d)
The data being hashed is corrupted.
16.
Which of the following is a common hashing algorithm?
a)
AES
b)
RSA
c)
MD5
d)
Ceaser-cipher
17.
In a public key encryption system, if Alice wants to send a message to Bob, she would:
a)
Encrypt the message with her private key and send it to Bob.
b)
Encrypt the message with Bob's public key and send it to him.
c)
Decrypt the message with her private key before sending it to Bob.
d)
Use a shared secret key for both encryption and decryption.
18.
The private key:
a)
Should be widely distributed for secure communication.
b)
Must be kept confidential by the owner for decryption.
c)
Can be used to verify the authenticity of a public key.
d)
Loses its effectiveness if the corresponding public key is compromised.
19.
A crucial characteristic of hashing functions is that they produce an output of:
a)
Variable length, based on the size of the input data.
b)
Encrypted data that requires a decryption key to access.
c)
A human-readable summary of the key points in the input data.
d)
Fixed length, regardless of the input data size.
20.
Steganography offers an advantage over encryption because:
a)
It provides a higher level of security against unauthorized access.
b)
It scrambles the data itself, making it unreadable without a key.
c)
It hides the existence of the data, making it less likely to be detected.
d)
It is faster and more efficient for processing large amounts of data.
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