How do we encrypt? Explain modern symmetric cryptography. Explain the digital signature scheme. Explain the cryptography...

How do we encrypt? Explain modern symmetric cryptography. Explain the digital signature scheme. Explain the cryptography tools. What is digital signature? What is steganography? Explain the protocol for secure communications.

Expert Solution

venereology answered 8 months ago

Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM...

Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM = (GenM, MacM, VrfyM) be a MAC scheme. (b) Prove that Π is unforgeable for any encryption scheme ΠE (even if not CPA-secure) and any secure MAC scheme ΠM (even if not strongly secure).

Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM...

Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM = (GenM, MacM, VrfyM) be a MAC scheme. (a) Formalize the construction of the “encrypt-then-authenticate” scheme Π = (Gen, Enc, Dec) given ΠE and ΠM

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? =...

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? = 33384. We send signed messages (m, r, s): (809, 18357, 1042) = hi and (22505, 18357, 26272) = bye. (a). Show that the same value of k was used for each signature. (b). Use this fact to find this value of k and to find the value of “a” such that ? ≡ ?? (??? ?).

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? =...

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? = 33384. We send signed messages (m, r, s): (809, 18357, 1042) = hi and (22505, 18357, 26272) = bye. (a). Show that the same value of k was used for each signature. (b). Use this fact to find this value of k and to find the value of “a” such that ? ≡ ?? (??? ?).

Suppose we use the ElGamal signature scheme with p = 65539, ?=2,?=33384. We send signed messages...

Suppose we use the ElGamal signature scheme with p = 65539, ?=2,?=33384. We send signed messages (m, r, s): (809, 18357, 1042) = hi and (22505, 18357, 26272) = bye. (a). Show that the same value of k was used for each signature. (b). Use this fact to find this value of k and to find the value of “a” such that ?≡?? (??? ?).

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How do we encrypt? Explain modern symmetric cryptography. Explain the digital signature scheme. Explain the cryptography...

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Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM...

Topic: Encrypt-then-authenticate scheme, Cryptography Let ΠE = (GenE, EncE, DecE) be an encryption scheme and ΠM...

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? =...

Suppose we use the ElGamal signature scheme with p = 65539, ? = 2, ? =...

Suppose we use the ElGamal signature scheme with p = 65539, ?=2,?=33384. We send signed messages...

Does a digital signature by itself provide authentication? Explain why or why not.

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