Hashing and Digital Signatures - CompTIA Security+ SY0-701 - 1.4

Which technique is used to ensure data integrity?

• Encryption

• Hashing

• Compression

• Encoding

What is a primary use of digital signatures?

• To verify message authenticity and integrity

• To encrypt data for secure transmission

• To create digital copies of physical documents

• To enhance the speed of data transfer

What is the purpose of adding a salt to a password hash?

• To prevent rainbow table attacks

• To increase the length of the password

• To encrypt the password

• To store the password securely

Why is the MD5 algorithm no longer recommended?

• It is vulnerable to collisions

• It is the fastest hashing algorithm

• It is widely used in modern applications

• It has a longer hash output than SHA-256

A primary requirement for a good cryptographic hash function is that the function should not have collisions. A collision in a hash function is when:

• two inputs map to the same output.

• one input produces multiple outputs.

• the output is longer than the input.

• the hash function is reversible.

In a scenario where Michael is sending confidential documents to William, what does integrity ensure about the documents during transmission?

• Data is accurate and untampered

• Data is encrypted and secure

• Data is compressed for faster transmission

• Data is accessible to all parties involved

Which hashing algorithm is known for producing a 256-bit output?

• MD5

• SHA1

• SHA256

• RIPEMD-160

Which hashing algorithm is considered to be the most secure as of 2024?

• MD5

• SHA-1

• SHA-256

• SHA-512

Which hashing algorithm is considered to be the most secure as of 2024?

• MD5

• SHA-1

• SHA-256

• CRC32

How do digital signatures ensure message authenticity?

• By hashing the message and encrypting the hash with a private key

• By encrypting the entire message with a public key

• By using a timestamp to verify the message

• By sending the message through a secure channel