Symmetric and Asymmetric encryption

What is encryption? Encryption is divided into two parts: algorithm and secret key. The algorithm is constant, the key is changed, see the following example.

Secret key: abcedfgh->12345678.

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

For example, ADFH is encrypted after 1568.

Encryption key K decryption Key K ' is the same as symmetric encryption.

Advantages of Symmetric encryption: fast encryption.

The disadvantage of symmetric encryption: Key transmission is not secure.

What is non-symmetric encryption, such as:

Encryption key K decryption key K ' is not the same as asymmetric encryption.

Advantages of Asymmetric Encryption: there is no key transport security issue.

The disadvantage of asymmetric encryption: encryption is slow.

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

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Symmetric and Asymmetric encryption