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WorksheetsCryptography
Total questions: 20
Worksheet time: 7mins
Name
Class
Date
1.
Which key is used for only one session?
a)
Master Key
b)
Data Key
c)
Session Key
d)
Public Key
2.
How is a master key usually protected?
a)
Encrypted with AES
b)
Stored in a cloud server
c)
Secure hardware and access control
d)
Shared with all users
3.
What problem arises when every pair of devices needs a key?
a)
Key management becomes complex
b)
Data gets lost
c)
Too many certificates
d)
Nothing happens
4.
Why can’t a master key be encrypted like other keys?
a)
It is too large
b)
Would require another key, creating a loop
c)
It is not used often
d)
It is always public
5.
Which technique helps manage keys in a large system?
a)
Hashing
b)
Firewall
c)
Hierarchical Key Control
d)
Compression
6.
What does AES stand for?
a)
Advanced Encryption Standard
b)
Authenticated Exchange System
c)
Automated Encryption Service
d)
Advanced Entry Security
7.
Which key protects other keys?
a)
Public Key
b)
Session Key
c)
Data Key
d)
Master Key
8.
What is the role of a KDC in symmetric key distribution?
a)
Store user passwords
b)
Generate session keys
c)
Encrypt files
d)
Create digital signatures
9.
How is data commonly protected in cryptography?
a)
Watermarking
b)
Hashing only
c)
Encryption
d)
Compression
10.
Which key type is long-term and rarely changes?
a)
Session Key
b)
Master Key
c)
Symmetric Key
d)
Private Key
11.
What is one purpose of a digital certificate?
a)
To store encrypted passwords
b)
To prove key ownership
c)
To compress data
d)
To manage sessions
12.
What does X.509 relate to?
a)
Firewall configuration
b)
Certificate format
c)
File system encryption
d)
Biometric storage
13.
Session keys are typically used for:
a)
Encrypting backup files
b)
Establishing long-term secure links
c)
One-time communication sessions
d)
Storing data
14.
Public keys can be shared because:
a)
They are encrypted
b)
They do not reveal secrets
c)
They are stored in HSMs
d)
They expire quickly
15.
What does a Certification Authority (CA) do?
a)
Encrypts all user messages
b)
Manages firewalls
c)
Issues digital certificates
d)
Generates session keys
16.
How does caching help with public keys?
a)
Saves time in key lookups
b)
Increases key lifetime
c)
Reduces encryption
d)
Allows multiple keys per user
17.
What happens if a certificate is revoked?
a)
The public key is deleted
b)
It is placed on a revocation list
c)
User loses access forever
d)
Nothing happens
18.
Why is key management important in cryptography?
a)
To reduce internet speed
b)
To make decryption easier
c)
To ensure secure communication
d)
To store more data
19.
A secure way to distribute public keys is using:
a)
Text messages
b)
Unverified websites
c)
Digital certificates
d)
Flash drives
20.
A master key compromise could lead to:
a)
Faster network
b)
Data loss only
c)
All derived session keys being exposed
d)
Improved security
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