The security services that could be provided using just digital signature are:
Nonrepudiation and message authentication.
Explanation: By non-repudiation, it is meant that the signature cannot be denied by the signer. The signature can be denied by the receiver.
By message authentication, it is meant that the authentication of the sender is proved by the signature or public key of the sender. The sender is assured that signature is created by sender who has the secret private key.
The following security services could be provided using just digital signature. (Select all that apply.) ~...
Please state: (1) the process of generating a digital signature, and the security objectives that can be achieved by digital signature (2) the process of generating a message authentication code (MAC), and the security objectives that can be achieved by MAC.
For this discussion, find a recent news story that details a breach in information security. The breach could have occurred in a government organization or in a private company. Give a high-level summary to provide context to your peers (including a link to the article), then, in your posting, include the following: What kinds of policies would have helped to prevent this breach? Why would the policies you suggest help the organization? What can the organization do differently (in regards...
Chapter 06 Applied Cryptography 1. How is integrity provided? A. Using two-way hash functions and digital signatures B. Using one-way hash functions and digital signatures C. By applying a digital certificate D. By using asymmetric encryption 2. Which term refers to the matching of a user to an account through previously shared credentials? A. Nonrepudiation B. Digital signing C. Authentication D. Obfuscation 3. Which term refers to an arranged group of algorithms? A. Crypto modules B. Cryptographic service providers (CSPs)...
41. Which of the following cipher systems uses polyalphabetic substitution? A. Vigenère B. Substitution C. Transposition D. Shift 42. Which encryption algorithm can have key sizes of 128, 192, and 256 bits, with the key size affecting the number of rounds used in the algorithm? A. SHA B. RC С. AES D. DES 43. Which of the following security principles ensures that the sender and the recipient of a message are informed that the message was not altered in transmission?...
1. Something you know (SYK) Something you have (SYH) Something you are (SYA) Something you do (SYD) are attributes that allow you to do what to a user? ___________ 2. Consider the primitive case of asymmetric encryption; no digital signature and no digital envelope. A person sends a message to a recipient using asymmetric encryption. What is the total number of keys used to send and receive the single message? _________________ 3. If the sender of a message encrypts the...
(Authentication with Alice cheating) Let’s assume Trudy is Alice’s little sister. Alice produces the message “Transfer $100,000 from Bob to Trudy’s account” and appends it with a valid signature sign(x) of Bob. She then claims that she received this message from Bob. Can Bob prove that he could not have signed this message? 1. In this problem, we will compare the security services provided by Digital Signatures (DS) and Message Authentication Codes (MAC). We assume that Trudy is able to...
Which security services can be supplied by a IPSec VPN? (select all that apply)
Check all that apply. The core components of digital imaging are Select one or more a Security and System Management b. Handling c Printing d PACS e Communications Protoco D Presentation Data Service
Digital Signature (5-5): In the course notes we looked at RSA for encryption and signatures (using exactly the same mathematical formula), and ElGamal for encryption. There has been several questions on using ElGamal for signature. The ElGamal encryption algorithm cannot be used for signatures but there are signature schemes that is based on discrete logarithm. (a) Search for simple explanation of the ElGamal signature scheme and DSA signature scheme (Hint: Wikipedia). Can these algorithms be used to encrypt a message?...
Consider the following scenario: Alice receives a message, a digital signature and a certificate from Bob. In order to verify the signature, Alice does the following: Hashes the received message using the same hash algorithm that Bob used, that's your calculated hash Decrypts the signature using the public key contained in the certificate, that your decrypted hash Compares the calculated hash and the decrypted hash Because the 2 hashes are identical, Alice goes on and: Checks the validity period on...