Worksheetsquiz gusto turo ayaw?
Total questions: 50
Worksheet time: 50mins
Name
Class
Date
1.
What is the main purpose of cryptography?
a)
To make data unreadable to unauthorized users
b)
To speed up data transmission
c)
To compress files
d)
To delete sensitive information
2.
Which feature ensures data has not been altered?
a)
Confidentiality
b)
Integrity
c)
Availability
d)
Redundancy
3.
What is plaintext?
a)
Encrypted text
b)
Original readable message
c)
Random binary code
d)
Hash of a message
4.
What is ciphertext?
a)
Decrypted message
b)
Original text
c)
Scrambled encrypted message
d)
A compression output
5.
What does symmetric encryption use?
a)
Two different keys
b)
Public directory
c)
One shared key
d)
No keys
6.
Which algorithm is symmetric?
a)
RSA
b)
AES
c)
Diffie-Hellman
d)
Elliptic Curve
7.
Asymmetric cryptography uses:
a)
One shared key
b)
Two keys: public and private
c)
No keys
d)
Three keys
8.
Which is an example of asymmetric encryption?
a)
AES
b)
DES
c)
RSA
d)
SHA-1
9.
Hash functions are:
a)
Reversible
b)
One-way
c)
Two-way
d)
Keyless and reversible
10.
Hash functions are used mainly for:
a)
Compression
b)
Data integrity
c)
Authentication only
d)
Speeding up networks
11.
SHA-1 produces how many bits?
a)
256
b)
128
c)
160
d)
512
12.
What is a message digest?
a)
Encrypted message
b)
Final hash output
c)
A binary key
d)
A random number
13.
SHA-1 is considered:
a)
Two-way
b)
Reversible
c)
One-way
d)
Symmetric
14.
A small change in input causing big change in hash is called:
a)
Salt effect
b)
Avalanche effect
c)
Key stretching
d)
Diffusion
15.
Message padding is needed to:
a)
Make hashing faster
b)
Fit message into block size
c)
Hide data
d)
Split into keys
16.
DES is classified as:
a)
Asymmetric cipher
b)
Symmetric block cipher
c)
Hash algorithm
d)
Stream cipher
17.
DES block size is:
a)
32 bits
b)
56 bits
c)
64 bits
d)
128 bits
18.
DES key size is:
a)
64 bits
b)
56 bits
c)
128 bits
d)
160 bits
19.
DES uses how many rounds?
a)
8
b)
12
c)
16
d)
32
20.
DES structure type is:
a)
AES box
b)
Feistel structure
c)
S-curve
d)
Hash chain
21.
Which step starts DES encryption?
a)
Final permutation
b)
Splitting into halves
c)
Splitting into halves
d)
XOR with key
22.
In DES, L0 and R0 refer to:
a)
Keys
b)
Halves of plaintext
c)
Substitution boxes
d)
Hash results
23.
What is the purpose of S-boxes in DES?
a)
Rearrange bits
b)
Substitute bits
c)
Compress data
d)
Decrypt message
24.
DES decryption differs by:
a)
Changing block size
b)
Using reversed key order
c)
Using XOR only
d)
Using more rounds
25.
DES is considered outdated because:
a)
Too fast
b)
Too strong
c)
Too small key size
d)
Uses blocks
26.
AES is:
a)
Asymmetric
b)
A modern symmetric cipher
c)
A hashing algorithm
d)
A digital signature
27.
What is cryptography used for in web browsing?
a)
Aesthetic purposes
b)
Secure HTTPS connections
c)
File size
d)
Save battery
28.
Digital signatures verify:
a)
Password age
b)
Sender identity & integrity
c)
File size
d)
Computer speed
29.
Cryptography in cryptocurrencies ensures:
a)
Lower data cost
b)
Transaction security
c)
Faster downloads
d)
File compression
30.
End-to-end encryption protects:
a)
Advertisements
b)
Communication between sender & receiver
c)
File formats
d)
Video resolution
31.
Authentication means:
a)
Approving software updates
b)
Verifying identity
c)
Encrypting passwords
d)
Checking file format
32.
Which is a form of authentication?
a)
Caching
b)
Password login
c)
File compression
d)
RAM allocation
33.
2FA requires:
a)
Two passwords
b)
Password + another factor
c)
Two usernames
d)
Only a biometric
34.
Digital fingerprints refer to:
a)
Biometrics only
b)
Hash values
c)
Digital signatures
d)
Usernames
35.
Hashing is used in password storage because it is:
a)
Reversible
b)
One-way
c)
Fast
d)
Temporary
36.
Message padding solves issues with:
a)
Key sharing
b)
Variable message size
c)
Bandwidth
d)
Identity theft
37.
Which is TRUE about hash functions?
a)
They use two keys
b)
Fixed-length output
c)
They can be decrypted
d)
They compress data
38.
A common use of message digests is:
a)
Video editing
b)
File integrity verification
c)
Color correction
d)
Database sorting
39.
What happens if a single bit changes before hashing?
a)
Output stays same
b)
Output slightly changes
c)
Output changes drastically
d)
No hash produced
40.
SHA-1 is used in:
a)
Image enhancement
b)
File checksums
c)
Video compression
d)
RAM testing
41.
What best describes cryptography?
a)
Art of deleting data
b)
Science of securing information
c)
Sending large files
d)
A type of firewall
42.
Symmetric keys must be:
a)
Public
b)
Shared secretly
c)
Posted online
d)
Stored in plaintext
43.
Asymmetric cryptography improves security by:
a)
Sharing both keys
b)
Not sharing private key
c)
Removing encryption
d)
Using long passwords
44.
AES uses what block size?
a)
64 bits
b)
128 bits
c)
32 bits
d)
160 bits
45.
DES expands the right half to:
a)
64 bits
b)
48 bits
c)
32 bits
d)
16 bits
46.
The final permutation in DES happens:
a)
Before rounds
b)
After rounds
c)
Before splitting halves
d)
During hashing
47.
Cryptography protects users from:
a)
Screenshots
b)
Eavesdropping
c)
Low battery
d)
Lag
48.
Hash values are sometimes called:
a)
Signatures
b)
Digests
c)
Keys
d)
Blocks
49.
Which does NOT use cryptography?
a)
Password hashing
b)
Secure messaging
c)
HTTPS
d)
Text editors
50.
The main purpose of DES rounds is:
a)
Reduce file size
b)
Strengthen security
c)
Break encryption
d)
Speed up CPU
100 %
