Question

(a): A VigenÃ¨re cipher with encryption key DELTA has been used to produce the ciphertext ZLPKEDQT. What was the plaintext? The following table is provided for your convenience: C D E G H I J K L M N O P Q R S T U V W X Y Z 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 (bi): Alice wants to digitally sign the message [4,5] with the help of RSA. She uses the public key (91,29) and a private key 5. Compute the signed message: (bii). With the same RSA electronic signature as in part (bi), Bob received a signed message [10] from Alice. What was the initial message? (c): Alice and Bob want to create a shared secret number with the help of the Diffie-Hellman protocol. Bob receives the triple (127, 6, 17) from Alice. Then he chooses the private key 3 and sends Alice the number 89. Compute.

          (a): A VigenÃ¨re cipher with encryption key DELTA has been used to produce the ciphertext ZLPKEDQT. What was the plaintext?
The following table is provided for your convenience:
C D E
G H I J K L M N O P Q R S T U V W X Y Z
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
(bi): Alice wants to digitally sign the message [4,5] with the help of RSA. She uses the public key (91,29) and a private key 5. Compute the signed message:
(bii). With the same RSA electronic signature as in part (bi), Bob received a signed message [10] from Alice. What was the initial message?
(c): Alice and Bob want to create a shared secret number with the help of the Diffie-Hellman protocol. Bob receives the triple (127, 6, 17) from Alice. Then he chooses the private key 3 and sends Alice the number 89. Compute.

a a vigenere cipher with encryption key delta has been used to produce the ciphertext zlpkedqt what was the plaintext the following table is provided for your convenience c d e g h1 j k l m 47835

Added by Anthony S.

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