What dimensions do digital signatures and hash digests add to ...

[Melani1276]

What dimensions do digital signatures and hash digests add to public key cryptography? Describe how this technology works.
 
  What will be an ideal response?

Question 2

What is the first step in developing an e-commerce security plan?
 
  A) Create a security organization.
  B) Develop a security policy.
  C) Perform a risk assessment.
  D) Perform a security audit.

[31809pancho]

Answer to Question 1

Digital signatures and hash digests can add authentication, nonrepudiation, and integrity when used with public key encryption. Encryption technology also allows for digital signatures and authentication. The sender encrypts the message yet again using their private key to produce a digital signature.

To check the confidentiality of a message and ensure it has not been altered in transit, a hash function is used first to create a digest of the message. A hash function is an algorithm that produces a fixed-length number called a hash or message digest. To ensure the authenticity of the message and to ensure nonrepudiation, the sender encrypts the entire block of cipher text one more time using the sender's private key. This produces a digital signature or signed cipher text. The result of this double encryption is sent over the Internet to the recipient. Then, the recipient first uses the sender's public key to authenticate the message. Once authenticated, the recipient uses his or her private key to obtain the hash result and original message. As a final step, the recipient applies the same hash function to the original text and compares the result with the result sent by the sender. If the results are the same, the recipient now knows the message has not been changed during transmission. The message has integrity.

Answer to Question 2

C