Bob wants to send a signed email to Alice. In order to do this, which key will he use during the process of sending the email? Select one: a. Bob's private key b. Alice's private key c. Bob's public key d. Alice's public key
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Bob wants to send a signed email to Alice. In order to do this, which key will he use during the process of sending the email?
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- 2. RSA uses modulo math as the basis for creating a public and private key True. or. False 4.When the intruder knows some of the plaintext and cipher-text pairings, this is known as what type of attack? Cipher-text attack Known-plaintext attack Chosen-plaintext attackFor what purpose does Alice use Bob’s digital certificate? a.For ensuring the authenticity of Bob's public key. b.For ensuring the authenticity of Bob's private key. c.For ensuring the authenticity of Alice's private key. d.For ensuring the authenticity of CA (Certificate Authority)’s public key. Clear my choiceWhen Karim receives the message, he would like to verify the digital signature. What key should he use to decrypt the signature? a. Karim's public key b. Karim's private key c. Jini's public key d. Jini's private key
- Which of the following is the most important principle that ensures secured use of a public key algorithm? a) Protection of the private key b) Distribution of the shared key c) Integrity of the message d) History of session keysGiven the following: A block cipher ?(?, ?) that takes a 32-bit plaintext block ?? and a 32-bit key ? and generates a 32-bit ciphertext ?? = (?? ⋘ 4) ⊕ ?. A 32-bit key ? = ????????. A constant ? = ??. Answer the following questions about CMAC. What is the value of ?1, the first generated key? What is the value of ?2, the second generated key? What is the authentication tag generated for the 8-byte message ? = ????????????????? What is the authentication tag generated for the 6-byte message ? = ?????????????Alice receives an email, apparently signed using a PGP private key by Bob. she does not know Bob’s public key, but she knows and has signed the public keys of Carol and -Dave. Dave has signed the keys of Alice, Bob and Eve. Eve has signed Carols and Dave’s keys. Alice has “complete trust” in Dave, and “part trust” in carol and Eve. Should Alice accept the signature on Bob’s email? Explain your answer, specifying any assumptions you make about PGP.
- In which cryptography technique, sender and the receiver use different keys?. A Public key cryptography B Digital signature C Symmetric key cryptography D Hash cryptographyHi Just need answer, no need explanation: Which is an advantage of symmetric key encryption? Strength Speed Error correction Key management How many keys are needed using symmetric cryptography to fully connect 1,000 people? 1,000 2,000 499,500 1,000,000 How many rounds of operations in standard DES? 16 32 64 128 A symmetric key block cipher adopted by NIST as the U.S. federal crypto standard in 2001 is ___________. DES Triple DES RSA AES A cipher mode of operations that operates on one bit or byte at a time is called ___________. block stream chain feedbackWhich of the following algorithms are not asymmetric? RSA Elliptic curve cryptography (ECC) AES Diffie- Hellman If an individual encrypts a message with his own private key, what does this assure? Integrity Confidentiality Availability Message Authenticity
- Which is more secure, symmetric or asymmetric key cryptography? Justify your response.What type of key is used in symmetric cryptography, must be known by both parties, and is used for both encryption and decryption? Group of answer choices Ciphertext Shared secret Private key Public keyQuestion2 part2 f. Using public key infrastructure name two reasons why, for some purposes, Alice might preferto use a message authentication code, instead of a digital signature, to protect the integrityand authenticity of her messages to Bob.