CREST CREST Cryptography & Data Protection

Question 1

Which symmetric encryption algorithm uses a 256-bit key and is approved by NIST for protecting sensitive US government data?

Accepted Answer

AES-256

Answer

3DES

Answer

RC4

Answer

Blowfish

Question 2

In asymmetric cryptography, what is used to encrypt data so that only the intended recipient can decrypt it?

Accepted Answer

Recipient's public key

Answer

Recipient's private key

Answer

Sender's private key

Answer

Sender's public key

Question 3

Which hashing algorithm produces a 256-bit digest and is recommended for integrity verification in modern CREST assessments?

Accepted Answer

SHA-256

Answer

MD5

Answer

SHA-1

Answer

CRC32

Question 4

What cryptographic concept ensures that a sender cannot later deny having sent a message?

Accepted Answer

Non-repudiation

Answer

Confidentiality

Answer

Integrity

Answer

Availability

Question 5

Which protocol uses asymmetric cryptography during its handshake to establish a symmetric session key?

Accepted Answer

TLS

Answer

FTP

Answer

HTTP

Answer

Telnet

Question 6

What is a rainbow table attack used to defeat?

Accepted Answer

Hashed passwords without salts

Answer

Encrypted disk images

Answer

TLS certificates

Answer

Firewall rules