Symmetric encryption and asymmetric encryption, asymmetric encryption

Symmetric encryption and asymmetric encryption, asymmetric encryption

What is encryption? Encryption is divided into two parts: algorithm and key. The algorithm remains unchanged, and the key changes. For more information, see the following example.

Key: abcedfgh-> 12345678.

Algorithm: in plaintext, each bit is replaced by another bit in the key table.

For example, after adfh is encrypted, It is 1568.

Symmetric encryption is used if the encryption key K is the same as the decryption key K.

Advantages of symmetric encryption: Fast encryption.

Disadvantage of symmetric encryption: The key transmission is insecure.

What is asymmetric encryption, such:

The encryption key K and the decryption key K' are different in asymmetric encryption.

The advantage of asymmetric encryption: There is no key transmission security problem.

The disadvantage of asymmetric encryption: the encryption speed is slow.

In asymmetric encryption, the encryption key is also called the public key, and the decryption key is also called the private key. See:

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