Alice wants to send a message m to Bob using Rabin Cryptosystem. Bob makes the public...
Alice wants to send a message m to Bob using Rabin Cryptosystem. Bob makes the public key n = 77 and sends it to Alice. By using Rabin Cryptosystem,
a) Alice encrypts her message m and sends the encrypted message c to Bob. What are the encrypted messages if m = 8, 36, 41 and 69?
b) Alice encrypts her message m = 6 and sends the encrypted message c to Bob. Bob decrypts the message. What are the possible options for the message m? Can Eve decrypt the message? Why?
c) Alice encrypts her message m = 41 and sends the encrypted message c to Bob. Bob decrypts the message. What are the possible options for the message m? Can Eve decrypt the message? Why?
d) Alice encrypts her message m and sends c = 56 to Bob. Bob decrypts the message. What are the possible options for the message m? Can Eve factorize the public key n? Why?
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Alice wants to send a message m to Bob using
Rabin Cryptosystem. Bob makes the public...
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...
2. Alice is a student in CSE20. Having learned about the RSA cryptosystem in class, she...
2. Alice is a student in CSE20. Having learned about the RSA cryptosystem in class, she decides to set-up her own public key as follows. She chooses the primes p=563 and q = 383, so that the modulus is N = 21 5629. She also chooses the encryption key e-49. She posts the num- bers N = 215629 and e-49 to her website. Bob, who is in love with Alice, desires to send her messages every hour. To do so,...
all infor given 4. Supppose Alice and Bob are using the prime p = 1451 and...
all
infor given
4. Supppose Alice and Bob are using the prime p = 1451 and the base g = 2 for an ElGamal cryptosystem. (a) Alice chooses a = 753 as her private key. What is the value of her public key A? (b) Now suppose Bob chooses b = 500 as his private key, and thus his public key is 464 mod 1451. Alice encrypts the message m = 284 using the ephemeral key k=512. What is the...
(8) In an RSA cryptosystem, Bob’s public key is (n = 629, e = 43). Alice...
(8) In an RSA cryptosystem, Bob’s public key is (n = 629, e = 43). Alice uses this public key to encrypt the word “MARCH” and send the ciphertext to Bob. First, she represents this word in ASCII where the capital letters A, B, C, . . . , X, Y, Z are represented by integers 65, 66, 67, . . . , 88, 89, 90 respectively. Then she encrypts the five integers that represent M, A, R, C, H...
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....
prime factorization. Assume that zoy wants to send a message to sam. sam generates public and...
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Bob wants to send an encrypted message using public key cryptography to Alice. What key does...
Bob wants to send an encrypted message using public key cryptography to Alice. What key does he use for encryption? You need to be explicit whose key it is and what kind of key it is. 1 AB I
your answer. Refer to attack scenarios on mutual authentication protocols that were discussed during the Lecture-7 and...
your answer. Refer to attack scenarios on mutual authentication protocols that were discussed during the Lecture-7 and Tutorial-7.] 5 Marks] Q5 (OpenSSL and IPFS) Assume that the School of Science of RMIT University is planning to use IPFS-based repository of sensitive files for sharing among staffs. An owner of a particular file, say Alice wants to share the file to her supervisor, say Bob. Therefore, Alice encrypts the file with Alice and Bob's shared AES secret key (KaB) using OpenSSL,...
5. Consider the RSA encryption scheme, Alice wants to send a message to Bob. Both Alice...
5. Consider the RSA encryption scheme, Alice wants to send a message to Bob. Both Alice and Bob have p= 17,9 = 19. Alice has e=31 and Bob has e=29. a. What is the public key pair used in the transmission? 2 marks b. What is the secret key pair used in the transmission? 4 marks c. Encrypt the message m=111. 4 marks d. Decrypt the resulting ciphertext. 4 marks e. What's the security problem between Alice and Bob? How...
PLEASE ANSWER A) THROUGH C) 2. Alice uses the GGH cryptosystem with private basis Di =...
PLEASE ANSWER A) THROUGH
C)
2. Alice uses the GGH cryptosystem with private basis Di = (4.13), 09 = (-57,-45), and public basis wu = (25453, 9091), W2 = (-16096, -5749). (a) Compute the determinant of Alice's lattice and the Hadamard ratio of the private and public bases. (b) Bob sends Alice the encrypted message e = (155340,55483). Use Alice's private basis to decrypt the message and recover the plaintext. Also determine Bob's random perturbation r. (c) Try to decrypt...
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...
2. Alice is a student in CSE20. Having learned about the RSA cryptosystem in class, she decides to set-up her own public key as follows. She chooses the primes p=563 and q = 383, so that the modulus is N = 21 5629. She also chooses the encryption key e-49. She posts the num- bers N = 215629 and e-49 to her website. Bob, who is in love with Alice, desires to send her messages every hour. To do so,...
all
infor given
4. Supppose Alice and Bob are using the prime p = 1451 and the base g = 2 for an ElGamal cryptosystem. (a) Alice chooses a = 753 as her private key. What is the value of her public key A? (b) Now suppose Bob chooses b = 500 as his private key, and thus his public key is 464 mod 1451. Alice encrypts the message m = 284 using the ephemeral key k=512. What is the...
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....
Bob wants to send an encrypted message using public key cryptography to Alice. What key does he use for encryption? You need to be explicit whose key it is and what kind of key it is. 1 AB I
your answer. Refer to attack scenarios on mutual authentication protocols that were discussed during the Lecture-7 and Tutorial-7.] 5 Marks] Q5 (OpenSSL and IPFS) Assume that the School of Science of RMIT University is planning to use IPFS-based repository of sensitive files for sharing among staffs. An owner of a particular file, say Alice wants to share the file to her supervisor, say Bob. Therefore, Alice encrypts the file with Alice and Bob's shared AES secret key (KaB) using OpenSSL,...
5. Consider the RSA encryption scheme, Alice wants to send a message to Bob. Both Alice and Bob have p= 17,9 = 19. Alice has e=31 and Bob has e=29. a. What is the public key pair used in the transmission? 2 marks b. What is the secret key pair used in the transmission? 4 marks c. Encrypt the message m=111. 4 marks d. Decrypt the resulting ciphertext. 4 marks e. What's the security problem between Alice and Bob? How...
PLEASE ANSWER A) THROUGH
C)
2. Alice uses the GGH cryptosystem with private basis Di = (4.13), 09 = (-57,-45), and public basis wu = (25453, 9091), W2 = (-16096, -5749). (a) Compute the determinant of Alice's lattice and the Hadamard ratio of the private and public bases. (b) Bob sends Alice the encrypted message e = (155340,55483). Use Alice's private basis to decrypt the message and recover the plaintext. Also determine Bob's random perturbation r. (c) Try to decrypt...
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