Overview
A key pair, including a public key and a private key, is usually used in asymmetric encryption scenarios, also called public key encryption. A public key can be publicly allocated to any user to encrypt data or verify signatures, while a private key must be kept securely and available only for the owner to decrypt data or generate signatures.
Working Principles
- Encryption and decryption
- When you use a public key to encrypt data, only the corresponding private key can be used to decrypt the data. For example, user A hopes to send messages to user B securely. In this case, A can use B's public key to encrypt the messages, and B can use its private key to decrypt the messages.
- If you use a private key to encrypt data, the public key can be used to decrypt data. This method is mainly used for digital signature to verify the information source and integrity.
- Digital signature
- A uses its private key generate a signature for data, and then sends the data and signature to B.
- B uses A's public key to verify the signature. If the verification is successful, the data is not tampered with and is from A.
Usage Process
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Operation |
Description |
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Describes how to create and delete a key pair. |
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Describes how to bind a key pair to an ECS, use a private key to log in to Linux ECS, and use a private key to obtain the password for logging in to Windows ECS. |
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Describes how to: |
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