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WorksheetsCNS CA2: Quiz Set A
Total questions: 15
Worksheet time: 8mins
The security of the RSA algorithm is based on the difficulty of:
Finding the discrete logarithm of a large number
Factoring large composite numbers
Solving the knapsack problem
Breaking the substitution cipher
Which cryptographic technique generates a fixed-size output (digest) regardless of the input message size?
Block Ciphers
Stream Ciphers
Hashing Functions
Public Key Cryptography
CMAC (Cipher-based Message Authentication Code) is typically based on which type of cipher?
Stream cipher
Public key cipher
Block cipher
Substitution cipher
A Digital Signature Scheme like DSS (Digital Signature Standard) provides which two security services?
Confidentiality and Availability
Integrity and Non-repudiation
Confidentiality and Integrity
Availability and Non-repudiation
The X.509 standard defines the format for what component of a PKI?
Symmetric encryption keys
Digital Certificates
Hash algorithms
Block cipher modes of operation
What is the role of the Certificate Authority (CA) in a PKI (Public Key Infrastructure)?
To manage private keys for users
To encrypt all communications within the network
To issue and revoke digital certificates, binding a public key to an identity
To perform brute-force attacks against weak encryption
Which IPSec protocol provides both confidentiality and integrity for the IP packet payload?
Authentication Header (AH)
Encapsulating Security Payload (ESP)
Internet Key Exchange (IKE)
Transport Layer Security (TLS)
Which property of a cryptographic hash function ensures that it’s computationally infeasible to find two different inputs giving the same output?
Avalanche effect
Collision resistance
Preimage resistance
Diffusion
The “ChangeCipherSpec” message in TLS indicates:
The switch from unencrypted to encrypted communication
Change of public key
Certificate revocation
Server authentication
NAC primarily enforces security policies based on:
IP routing table
Network traffic rate
User’s identity and device posture
Port number allocation
Which sequence correctly represents the order of TLS handshake steps?
ClientHello → ServerHello → Certificate → Key Exchange → Finished
ServerHello → ClientHello → Finished → Certificate
ClientHello → Key Exchange → Certificate → Finished
ClientHello → Finished → ServerHello
HTTPS uses which port by default?
21
35
80
443
. In IPSec, the term “Security Association (SA)” refers to:
A digital certificate
The policy
A logical connection defining security parameters between peers
Keys
If Alice signs a message hash using her private key, but the hash algorithm is weak (e.g., SHA-1), what could happen?
Private key exposure
Signature won’t verify
Key exchange failure
Attackers may find a different message with the same signature
A malicious user captures a Kerberos ticket and replays it later. Which Kerberos feature stops this?
Encrypted timestamp in the authenticator
Mutual authentication flag
Session-key length
TGS secret rotation
