WorksheetsIntroduction to Cryptography
Total questions: 20
Worksheet time: 13mins
What is the primary goal of cryptography?
To hide data from unauthorized parties
To compress data for efficient storage
To increase data transfer speed
To enhance data availability
Which cryptographic technique uses a single key for both encryption and decryption?
Asymmetric encryption
Symmetric encryption
Hashing
Digital signatures
Which of the following is NOT a commonly used cryptographic algorithm?
AES (Advanced Encryption Standard)
RSA (Rivest-Shamir-Adleman)
MD5 (Message Digest Algorithm 5)
JPEG (Joint Photographic Experts Group)
Which of the following is a characteristic of a strong cryptographic algorithm?
It is widely known and openly published
It relies on security through obscurity
It requires frequent key changes for effectiveness
It can be easily decrypted using basic computing power
Which type of attack involves trying every possible key until the correct one is found?
Dictionary attack
Brute-force attack
Rainbow table attack
Man-in-the-middle attack
What is the purpose of a digital signature in cryptography?
To encrypt data for secure transmission
To hide the contents of a message from unauthorized users
To generate random keys for encryption
To verify the authenticity and integrity of a message
Which cryptographic protocol is commonly used to secure internet communication, such as web browsing?
SSL (Secure Sockets Layer)
SMTP (Simple Mail Transfer Protocol)
FTP (File Transfer Protocol)
DHCP (Dynamic Host Configuration Protocol)
Which statement best describes symmetric encryption?
It uses two different keys for encryption and decryption
It is generally slower compared to asymmetric encryption
It is also known as public-key cryptography
It uses the same key for both encryption and decryption
What distinguishes asymmetric encryption from symmetric encryption?
Asymmetric encryption is faster than symmetric encryption
Asymmetric encryption uses the same key for both encryption and decryption
Asymmetric encryption is more secure for key exchange
Asymmetric encryption requires a secret key shared between communicating parties
The objectives of Cryptography
Data integrity
Authentication
Non-radiation
Non-repudiation
The possible attacks depend on the actual resources of the adversary Eve. They are usually classified as follows:
clue:(more than 2 answers)
Ciphertext-only attack
Known-plaintext attack
Chosen-plaintext attack
Adaptively-chosen-plaintext attack
Meaning of plaintext
coded message
original message
ciphertext
Same meaning as encrypt
cryptanalysis
cryptology
encipher
decipher
Same menaing as decrypt
cryptananalysis
cryptology
encipher
decipher
Advantages of symmetric-key cryptography
key must exchanges in secure way
simple
slower
faster
Asymmetric encryption use (a) keys, one to encrypt the data, and another key to decrypt the data
Asymmetric encryption use two keys:
Public key is to (a) the data
Asymmetric encryption use two keys:
Private key is to (a) the data
Message digest is generated using a set of (a) functions
. The resulting encrypted message is known as (a) signature
