In the context of the ElGamal scheme, suppose that Bob's public parameters are (229,6,173) and Alice's...
In the context of the ElGamal scheme, suppose that Bob's public parameters are (229,6,173) and Alice's private exponent is 149. What is the shared key?
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In the context of the ElGamal scheme, suppose that Bob's public
parameters are (229,6,173) and Alice's...
In the context of the ElGamal scheme, suppose that Bob's public parameters are (239,7, 172), Alice's...
In the context of the ElGamal scheme, suppose that Bob's public parameters are (239,7, 172), Alice's private exponent is 214 and the plaintext is 24. What is the pair of numbers that is sent through the insecure channel? Write your numbers separated by a "comma", put a space after the "comma."
Q3: Suppose Bob wants to send an encrypted message to Alice. Which one of the followings...
Q3: Suppose Bob wants to send an encrypted message to Alice. Which one of the followings is correct? 1. Bob uses a shared secret key to encrypt the message. Alice uses Bob's public key to decrypt the encrypted message. 2. Bob uses Alice's private key to encrypt the message. Alice uses a shared secret key to decrypt the encrypted message. 3. Bob uses Alice's public key to encrypt the message digest. Alice uses Bob's public key to decrypt the encrypted...
In ElGamal encryption scheme, assume that a prime modulus p = 451 and a generator g=288....
In ElGamal encryption scheme, assume that a prime modulus p = 451 and a generator g=288. If the private key is 23, what is the public key? Encrypt a message m=31 with a random value k=41 and decrypt the ciphertext.
5. Alice wishes to send the message m4 to Bob using RSA encryption. She looks up Bob's public key...
5. Alice wishes to send the message m4 to Bob using RSA encryption. She looks up Bob's public key and finds that it is (n-55. c= 3 (a) Specify exactly what information Alice sends to Bob (b) What is Bob's private key? Show how he would use it to recover Alice's message (c) Explain why Bob should never use this choice of public key in real life.
5. Alice wishes to send the message m4 to Bob using RSA encryption....
(8) Suppose that Samantha is using the Elgamal signature scheme and that she is careless and uses...
(8) Suppose that Samantha is using the Elgamal signature scheme and that she is careless and uses the same random element k to sign two documents D and D (6) Explain how Evan can tell at a glance whether Samantha has made this mistake (ii) If the signature on D is (S1, S2) and the signature on D' is (St, S2), explain how Evan can recover a, Samanthas private signing key. (ii) Apply your method fr) to the following example...
O-8. (15 points) Bob's simple toy RSA eryptosystem has public key kyub(n, e) (65,5), where n =p,-...
o-8. (15 points) Bob's simple toy RSA eryptosystem has public key kyub(n, e) (65,5), where n =p,-5x13-65 and e-5. I. Describe the key pair generation procedure for Bob to generate his private key kor- d. With the above given parameters, use EEA to calculate d 2. Describe RSA encryption procedure that Alice uses to encrypt her plaintext message x to its above given parameters, what will be y? ciphertext y before sending the message to Bob. Suppose Alice's message x-...
Question 11 (1 point) Approximately how many different starting settings could be created from the Enigma...
Question 11 (1 point) Approximately how many different starting settings could be created from the Enigma machine's remarkably simple architecture. Question 11 options: 160 X 10 ^9 160 X 10^36 160 X 10^72 160 X 10^18 Question 12 (1 point) PGP uses a two-phase encryption approach to encrypt a message, and a second two-phase approach to decrypt a message. Alice wishes to send a message to Bob that will be confidential and also prove to Bob that Alice was the...
Using RSA Implementation: 1. Alice's RSA public key is given by (e, n) = (59, 1189)....
Using RSA Implementation:
1. Alice's RSA public key is given by (e, n) = (59, 1189). = (a) Determine Alice's private key (d, n). (b) Bob sends his first message Mi 67 to Alice, encrypting it with RSA using Alice's public key. He obtains a cypher text Cị that gets forwarded to Alice. What is Cį? (c) Bob sends his second message M2 to Alice, encrypting it with RSA using Alice's public key. Eve, who was eavesdropping on the commu-...
8.17. Considering the four examples from Problem 8.13, we see that the Elgamal scheme is nondeterministic:...
8.17. Considering the four examples from Problem 8.13, we see that the Elgamal scheme is nondeterministic: A given plaintext x has many valid ciphertexts, e.g., both x=33 and x=248 have the same ciphertext in the problem above. 1. Why is the Elgamal signature scheme nondeterministic? 2. How many valid ciphertexts exist for each message x (general expression)? How many are there for the system in Problem 8.13 (numerical answer)? 3. IstheRSA crypto systemnondeterministic once the public key has been chosen?...
7) (i) You and Bob use Elgamal encryption with p=17 and g=3. You choose your private...
7) (i) You and Bob use Elgamal encryption with p=17 and g=3. You choose your private key a=4 and send A=-4 mod 17 to Bob (-4 is congruent to 3^4 mod 17), and Bob sends you (2,7). What is Bob's message? (ii) Alice and Bob use Elgamal encryption with p=13 and g=2. You noticed that Alice has sent A=11 mod 13 to Bob, and Bob has sent (5,7) to Alice. What is Bob's message?
Q3: Suppose Bob wants to send an encrypted message to Alice. Which one of the followings is correct? 1. Bob uses a shared secret key to encrypt the message. Alice uses Bob's public key to decrypt the encrypted message. 2. Bob uses Alice's private key to encrypt the message. Alice uses a shared secret key to decrypt the encrypted message. 3. Bob uses Alice's public key to encrypt the message digest. Alice uses Bob's public key to decrypt the encrypted...
5. Alice wishes to send the message m4 to Bob using RSA encryption. She looks up Bob's public key and finds that it is (n-55. c= 3 (a) Specify exactly what information Alice sends to Bob (b) What is Bob's private key? Show how he would use it to recover Alice's message (c) Explain why Bob should never use this choice of public key in real life.
5. Alice wishes to send the message m4 to Bob using RSA encryption....
(8) Suppose that Samantha is using the Elgamal signature scheme and that she is careless and uses the same random element k to sign two documents D and D (6) Explain how Evan can tell at a glance whether Samantha has made this mistake (ii) If the signature on D is (S1, S2) and the signature on D' is (St, S2), explain how Evan can recover a, Samanthas private signing key. (ii) Apply your method fr) to the following example...
o-8. (15 points) Bob's simple toy RSA eryptosystem has public key kyub(n, e) (65,5), where n =p,-5x13-65 and e-5. I. Describe the key pair generation procedure for Bob to generate his private key kor- d. With the above given parameters, use EEA to calculate d 2. Describe RSA encryption procedure that Alice uses to encrypt her plaintext message x to its above given parameters, what will be y? ciphertext y before sending the message to Bob. Suppose Alice's message x-...
Using RSA Implementation:
1. Alice's RSA public key is given by (e, n) = (59, 1189). = (a) Determine Alice's private key (d, n). (b) Bob sends his first message Mi 67 to Alice, encrypting it with RSA using Alice's public key. He obtains a cypher text Cị that gets forwarded to Alice. What is Cį? (c) Bob sends his second message M2 to Alice, encrypting it with RSA using Alice's public key. Eve, who was eavesdropping on the commu-...
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