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When Alice sends a message to Bob what key will she use to encrypt the message?
If Alice sends Bob a message and that message is encrypted with two keys simultaneously: a symmetric key (Ks) and Bob's public key. The symmetric key (Ks) is also sent to Bob, encrypted with the private key of Alice.
What will you use to encrypt your messages in asymmetric cryptography?
Asymmetric encryption uses a mathematically related pair of keys for encryption and decryption: a public key and a private key. If the public key is used for encryption, then the related private key is used for decryption. If the private key is used for encryption, then the related public key is used for decryption.
Which key would Bob use to decrypt an encrypted message that was received from Alice?
When Alice wishes to send him a message, she uses his public key to encrypt her message. Bob also has a secret key, his private key, that lets him decrypt these messages.
When Bob wants to send a secure message to Alice using an asymmetric cryptographic algorithm which key does he use to encrypt the message?
If Bob wants to send a reply to Alice, he simply encrypts the message using Alice's public key, and then Alice reads the message by decrypting it with her private key. 2).