Non-Repudiation 1.2

Question 1

Non-Repudiation is akin to what in regards to integrity?

Answer 1

Signing a contract
Your signature adds non-repudiation, you really did sign a contract, and others can see your signature

Question 2

What is Proof of Integrity?

Answer 2

Verify data didn’t change in transit to its destination by hashing the data

Question 3

What is a Hash, and what is it used for?

Answer 3

A Hash is a short string of text based on the plain text, used to verify the integrity of data.

If the data changes, the hash changes.

Question 4

Non-Repudiation combines these two concepts to fully maximize the integrity of data

Answer 4

Proof of integrity
Proof of Origin

Question 5

Proof of Origin

Answer 5

Proves the source of the data through the use of digital signatures

Question 6

Digital Signature

Answer 6

Uses a private key that is only known to the person sending the data, and a public key tied to the private key to verify it was used.

Any change to the message will invalidate the signature

Question 7

Creating a Digital Signature

Answer 7

1. Hashing algorithm creates a hash out of the plain text
2. Hash gets encrypted with User Ones private key (The Sender) and gets sent to User Two

Question 8

Verifying a Digital Signature

Answer 8

1. User Two receives message with digital signature attached
2. User Two uses User Ones public key to decrypt the hash
3. User Two performs the same hashing function that User One did and compares the two