How to distinguish symmetric encryption methods from asymmetric ones and what are their key differences?

Symmetric encryption methods use the same key for encrypting and decrypting data. This is a fast and efficient way but requires secure key exchange.

Asymmetric encryption methods use a pair of keys: a public key (for encryption) and a private key (for decryption). The public key can be freely distributed, while the private key is kept secret. This provides a more secure key exchange but algorithms are slower.

Key differences:

• Keys: symmetric — one shared key; asymmetric — a key pair.
• Speed: symmetric is faster.
• Security: asymmetric is more convenient for secure key exchange.

Example: Asymmetric encryption is often used to exchange a symmetric key, after which data is encrypted symmetrically for performance.