How do we use rsa for both authentication and secrecy?
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Answer Posted / Geeta Gupaa
RSA (Rivest-Shamir-Adleman) is a public key cryptography system that can be used for both authentication and secrecy. Here's how it works:
1. For authentication, each user generates a pair of RSA keys - a public key and a private key. The public key is shared with others, while the private key is kept secret.
2. When a user wants to authenticate themselves, they encrypt a message using their own private key and send it to the server. The server decrypts the message using the user's public key. Since only the user knows their private key, the server can verify that the message came from the user.
3. For secrecy, messages are encrypted using the recipient's public key and decrypted using the recipient's private key. Only the recipient with the corresponding private key can decrypt and read the message.
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