10.2 Asymmetric Encryption and Hashing

Question 1

What is the disadvantages with symmetric key encryption?

These disadvantages can be addressed with ____________.

Answer 1

1. As more individuals are included in the key exchange, there needs to be a key for each combination of individuals.
2. As more individuals are included in the key exchange, a key must be created for each combination of individuals.

These disadvantages can be addressed with asymmetric key encryption

Question 2

GPG is a command-line tool used to simplify the creation, encryption, and decryption of _________ key cryptography.

Answer 2

asymmetric

GPG is a command-line tool used to simplify the creation, encryption, and decryption of asymmetric key cryptography.

Question 3

__________ is a cryptographic method used to verify the integrity of data.

Answer 3

Hashing is a cryptographic method used to verify the integrity of data.

Question 4

Hashing takes plaintext and converts it to a message digest with an algorithm, and _______.

Answer 4

Hashing takes plaintext and converts it to a message digest with an algorithm, and no key

Question 5

Hashing is a _______ function, meaning it cannot be converted back to plaintext.

Answer 5

Hashing is a one-way function, meaning it cannot be converted back to plaintext.

Question 6

Hashing algorithms output fixed lengths. Regardless of the input length, the output length is always ________.

Answer 6

Hashing algorithms output fixed lengths. Regardless of the input length, the output length is always the same.

Question 7

Encryption’s main goal is _______. Hashing’s main goal is ________.

Answer 7

Encryption’s main goal is privacy. Hashing’s main goal is integrity.

Question 8

Hashing Algorithims

SHA

Answer 8

Stands for Secure Hashing Algorithms, and includes its successors, SHA1 and SHA2.

Question 9

Hashing Algorithims

SHA2

Answer 9

SHA2 has variations with different security strengths: SHA-256 and SHA-512

Question 10

Hashing Algorithims

MD

Answer 10

Stands for Message Digest and has several variations: MD2, MD4, and MD5

Question 11

Hashing Algorithims

LM and NTLM

Answer 11

Hashes used by Windows.

Question 12

What algorithim would you use if you want to

Answer 12

SHA2/SHA-256

Question 13

Cryptography can also be used to validate authenticity using ___________.

Answer 13

Cryptography can also be used to validate authenticity using digital signatures

Question 14

A ________ is a mathematical scheme

used to verify the authenticity of digital data.

Answer 14

digital signature

In the United States and several other countries, digital signatures are. considered legally binding.

Similar to asymmetric encryption, digital signatures also use public key cryptography.

However, digital signatures use public and private keys in reverse.

Question 15

When the message and the signataure are sent separately, that’s called a _________.

Answer 15

When the message and the signataure are sent separately, that’s called a detached signature.

Question 16

Other digital signatures include (3):

Answer 16

All at once - A signature appended to an encrypted message.

Clearsigned - A signature appended to an unencrypted message

Signed Hash - Instead of signing a message, a hash is created first and the hash is signed for verification.