COMPUTER ETHICS AND SECURITY
CRYPTOGRAPHY AND ENCRYPTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Alice’s private key
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Alice’s public key
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Bob’s private key
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Bob’s public key
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Detailed explanation-1: -Alice has both a public key and a private key, so she keeps her private key in a safe place and sends her public key to Bob. Bob encrypts the secret message to Alice using Alice’s public key. Alice can later decrypt the message with her private key.
Detailed explanation-2: -Upon receipt Bob will, if Alice sent the message encrypted with his public key, decrypt the message using his own private key. This will then reveal the encrypted digital signature. He will decrypt the digital signature using Alice’s corresponding public key to reveal the hash.
Detailed explanation-3: -Digital signatures work through public key cryptography’s two mutually authenticating cryptographic keys. For encryption and decryption, the person who creates the digital signature uses a private key to encrypt signature-related data. The only way to decrypt that data is with the signer’s public key.
Detailed explanation-4: -Overview Alice wants to send a message to Bob. Both Alice and Bob share the same secret key. To encrypt the message Alice XORs her message with the shared secret key. To decrypt the message Bob also XORs the message with his (the same) secret key.