Bob is trying to send a secure message to Alice. By generating these ciphertexts: C1 = Epub_A(P),   C2 = Epriv_B(C1), what security property could be achieved?

2. Suppose that Bob's public key is (p, a, ae) = (7481, 6, 5979). Alice receives the signed message (x, S1, S2) = (478, 1723, 7045) from Bob. Should she accept it?

Consider an RSA key set for Alice with p = 23, q = 17, n = 391 and e = 15.a)  Her public key is (e, n) = (15, 391). Is her private key (d, n) = (47, 391)? Justffy your answer. b)  Suppose Bob wants to encrypt a message 90 for Alice using RSA keys for confidenVality. Whatis the corresponding cipher text?Justify your answer.

Design a cryptographic solution for implementing the dinning cryptographers protocol.  You should consider the following: The secret messages shared between any two agents in the protocol are communicated over public channels only. The announcements made by each agent must be traceable in a trustworthy way to that agent.   Your solution should be a new protocol that addresses the above two requirements.

Consider an RSA key set for Alice with p = 23, q = 17, n = 391 and e = 15.a)  Her public key is (e, n) = (15, 391). Is her private key (d, n) = (47, 391)? JusVfy your answer. b)  Suppose Bob wants to encrypt a message 90 for Alice using RSA keys for confidenVality. Whatis the corresponding cipher text?Justify your answer.

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A shortcoming of using an elliptic curve E(Fp) for cryptography is the fact that it takes two coordinates to specify a point in E(Fp). However, as discussed briefly at the end of Sect. 6.4.2, the second coordinate actually conveys very little additional information.(b) Alice and Bob decide to use the prime p = 1123 and the elliptic curveE : Y2 = X3 + 54X + 87.Bob sends Alice the x-coordinate x = 278 and the bit β = 0. What point is Bob trying to convey to Alice? What about if instead Bob had sent β = 1?

Suppose Alice used a Hash function HA to encrypted her sensitive data. Everyone in the public can access her encrypted data.  Group of answer choices She must keep HA secret and should not share it with others. She can share HA  with other users. She must keep HA secret but can share it with others after encryption. None of the above.

Alice uses a shift cipher with a shift of 4 to encrypt her message to Bob. If the ciphertext she obtains is "ksshpygo", what is her message in plaintext?

Suppose that you receive a digital certificate that contains M and (h(M)]CA, where M = (Alice, Alice's public key) and "CA" is Certificate Authority. Assuming that you trust the CA, after verifying the signature on the certificate, what do you then know about the identity of the sender of the certificate? Remember that: [Xleob indicates encryption via Bob's private key to X (signature) h(X) indicates the cryptographic hash function applied to X O The sender is Alice O The sender is Trudy I cannot deduce the identity of the sender from the certificate The sender is the Certificate Authority