Question 4 (5 points) Consider the following scenario: Alice wants to send Bill a message. Alice...
Question 4 (5 points)
Consider the following scenario: Alice wants to send Bill a message. Alice encrypts some information using Bill's public key; Bill decrypts the ciphertext using his private key. This is an example of:
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Question 4 (5 points)
Consider the following scenario: Alice wants to send Bill a
message. Alice...
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...
Exercise 3.2 (Symmetric and Asymmetric Encryption) t In this exercise, you will send an encrypted...
Exercise 3.2 (Symmetric and Asymmetric Encryption) t In this exercise, you will send an encrypted message from a socket client to a socket server. The message will be encrypted using AES symmetric encryption algorithm in the client. The server receives this ciphertext and decrypt it using the same symmetric key. Before communication over symmetric encryption, you need to first securely distribute the symmetric key between sender and receiver. You can use asymmetric encryption to help distribute the symmetric key. The...
Consider the following scenario: Alice receives a message, a digital signature and a certificate from Bob....
Consider the following scenario: Alice receives a message, a digital signature and a certificate from Bob. In order to verify the signature, Alice does the following: Hashes the received message using the same hash algorithm that Bob used, that's your calculated hash Decrypts the signature using the public key contained in the certificate, that your decrypted hash Compares the calculated hash and the decrypted hash Because the 2 hashes are identical, Alice goes on and: Checks the validity period on...
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...
Suppose, Bob (the sender) wants to send a message to Alice. Before sending the message, Bob generates a digital signatur...
Suppose, Bob (the sender) wants to send a message to Alice. Before sending the message, Bob generates a digital signature. Assume that Bob and Alice use both of the public-key cryptography system and hash function when computing digital signatures. Say, the hash function used to compute and verify signatures is insecure, but the public-key cryptography system is secure. Show that Trudy can forge signatures.
Suppose, Bob (the sender) wants to send a message to Alice. Before sending the message, Bob generates a digital signatur...
Suppose, Bob (the sender) wants to send a message to Alice. Before sending the message, Bob generates a digital signature. Assume that Bob and Alice use both of the public-key cryptography system and hash function when computing digital signatures. Say, the hash function used to compute and verify signatures is insecure, but the public-key cryptography system is secure. Show that Trudy can forge signatures.
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...
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...
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
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....
Exercise 3.2 (Symmetric and Asymmetric Encryption) t In this exercise, you will send an encrypted message from a socket client to a socket server. The message will be encrypted using AES symmetric encryption algorithm in the client. The server receives this ciphertext and decrypt it using the same symmetric key. Before communication over symmetric encryption, you need to first securely distribute the symmetric key between sender and receiver. You can use asymmetric encryption to help distribute the symmetric key. The...
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...
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...
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...
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
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....
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