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Cryptography Quiz
Implementing Virtual Private Networks
Question 1 of 12
What is the primary difference between symmetric and asymmetric encryption?
Select the best answer:
Symmetric uses two keys; asymmetric uses one key
Symmetric uses one shared key; asymmetric uses a public/private key pair
Symmetric is only used for hashing; asymmetric is used for encryption
Symmetric requires a PKI; asymmetric does not
Which of the following is a symmetric encryption algorithm?
Select the best answer:
RSA
AES
Diffie-Hellman
SHA-256
Which encryption standard replaced DES due to its larger key size and stronger security?
Select the best answer:
3DES
AES
RC4
Blowfish
MD5 and SHA-1 are examples of:
Select the best answer:
Symmetric encryption algorithms
Asymmetric key exchange protocols
One-way cryptographic hash functions
Digital certificate formats
SHA-256 is preferred over MD5 for integrity verification because:
Select the best answer:
SHA-256 is faster to compute than MD5
MD5 is vulnerable to collision attacks; SHA-256 provides a larger, more collision-resistant hash
SHA-256 can encrypt data while MD5 cannot
MD5 requires a key; SHA-256 is keyless
A digital signature provides which two security services?
Select the best answer:
Confidentiality and availability
Authentication and non-repudiation
Integrity and availability
Confidentiality and integrity only
In Public Key Infrastructure (PKI), a Certificate Authority (CA) is responsible for:
Select the best answer:
Encrypting all network traffic between clients and servers
Issuing and signing digital certificates that bind a public key to an identity
Generating symmetric session keys for TLS connections
Storing private keys on behalf of end users
Diffie-Hellman (DH) key exchange is used to:
Select the best answer:
Encrypt bulk data using a symmetric cipher
Securely establish a shared secret key over an untrusted channel
Sign digital certificates in a PKI hierarchy
Hash passwords before storing them in a database
Which DES successor applies the DES algorithm three times with different keys?
Select the best answer:
AES
3DES
Blowfish
RC4
An HMAC (Hash-based Message Authentication Code) combines a hash function with:
Select the best answer:
A digital certificate from a CA
A shared secret key
An asymmetric RSA key pair
A Diffie-Hellman group exchange
In PKI, which document lists certificates that have been revoked before their expiration date?
Select the best answer:
Certificate Signing Request (CSR)
Certificate Revocation List (CRL)
Online Certificate Status Protocol (OCSP) staple
Distinguished Encoding Rules (DER) file
Which key does a recipient use to verify a digital signature?
Select the best answer:
The sender's private key
The recipient's private key
The sender's public key
A shared symmetric key agreed via Diffie-Hellman
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