Secure Messaging Using Asymmetric Cryptographic Algorithm

How does Asymmetric Cryptographic Algorithm work for secure messaging?

Asymmetric cryptographic algorithm, also known as public-key cryptography, is a method of encrypting and decrypting messages using a pair of keys – a public key and a private key. This system allows for secure communication between parties without the need to share a secret key.

The steps involved in using an asymmetric cryptographic algorithm for secure messaging are as follows:

1. Each user generates a pair of keys - a public key and a private key.
2. Each user shares their public key with others by registering it or making it accessible.
3. When a user wants to send a secure message to another user, the sender encrypts the message using the recipient's public key.
4. The recipient then decrypts the message using their private key.

Which key does userB use to decrypt the message from userA?

Answer: userB will use his/her private key.

Explanation: If userA wants to send a secure message to userB using an asymmetric cryptographic algorithm, userA will encrypt the message using userB's public key. When userB receives the encrypted message, he/she will decrypt it using his/her private key. This ensures that only userB, who possesses the corresponding private key, can access the original message.

If userA wants to send a secure message to userB using an asymmetric cryptographic algorithm, which key does userB use to decrypt the message?

userB will use his/her private key.