Private key cryptography is also known as asymmetric cryptography. In asymmetric cryptography, each user has two keys: a public key and a private key. The public key is shared with everyone, while the private key is kept secret. To encrypt a message, the sender uses the recipient’s public key. The recipient can then decrypt the message using their private key. This type of cryptography is more secure than symmetric cryptography, which uses the same key for both encryption and decryption.
Public key cryptography is used in a variety of applications, including secure email, digital signatures, and online banking. It is also used in some blockchain technologies, such as Bitcoin.
Here is a brief explanation of each option:
- Public key cryptography: This type of cryptography uses two keys, a public key and a private key. The public key is shared with everyone, while the private key is kept secret. To encrypt a message, the sender uses the recipient’s public key. The recipient can then decrypt the message using their private key. This type of cryptography is more secure than symmetric cryptography, which uses the same key for both encryption and decryption.
- Symmetric cryptography: This type of cryptography uses a single key for both encryption and decryption. The key must be shared between the sender and the recipient. Symmetric cryptography is less secure than public key cryptography, but it is faster.
- Asymmetric cryptography: This type of cryptography uses two keys, a public key and a private key. The public key is shared with everyone, while the private key is kept secret. To encrypt a message, the sender uses the recipient’s public key. The recipient can then decrypt the message using their private key. This type of cryptography is more secure than symmetric cryptography.
- None: This is not a valid option.