Which encryption method uses the following method: 1) Party B encrypts his plain text message with Party A’s Public Key 2) Party B then sends the encrypted cipher text message to Party A via email 3) Party A opens Party B’s email then decrypts the encrypted cipher text message with Party A’s Private Key Question 48 options: Two Factor Encryption Symmetric Encryption Asymmetric Encryption Email-based Keyed Encryption
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Step 1: Party B encrypts his plain text message with Party A’s Public Key. Show more…
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Given are two protocols in which the sender's party performs the following operation: Protocol A: y = Ek1(Ekpub,r(x)||H(k2||x)) where x is the message, H is a hash function, E is a symmetric-key encryption algorithm, "||" denotes simple concatenation, k1 and k2 are secret keys which are only known to the sender and the receiver, and kpub,r is a public key of the receiver. Protocol B: y = Ek(Ekpub,r(x)||sigkpr,s(H(x))) where k is a shared secret key only known to the sender and the receiver, kpr,s is a private key of the sender (not shared with the receiver), and kpub,r is a public key of the receiver. (a) For each protocol, provide a step-by-step description (e.g., with an itemized list) of what the receiver does upon reception of y. [kpub,s is a public key of the sender, kpub,r is a public key of the receiver] (b) State whether the following security services are given for each of the two prescribed protocols: - confidentiality - integrity - non-repudiation (preventing an entity from denying previous commitments or actions)
Akash M.
A secure email system is expected to provide confidentiality, sender's non-repudiation, and message integrity. Alice uses three keys to achieve this goal. The three keys are Alice's private key (KA-), Bob's public key (Kg*), and a randomly generated symmetric key (Ks). The encryption procedure is shown below: How can Bob 1) decrypt the data, 2) verify the message's integrity, and 3) verify the sender's non-repudiation? Describe the detailed steps (including the formulas) and show your work.
12. Alice wants to provide secrecy using only asymmetric key cryptography before sending her message to Bob. a) What does Bob receive? b) Explain by a scenario and steps what should Bob do to retrieve the original message. c) Explain what Bob receives if she decided to use session key cryptography.
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