对称密钥加密：
加密是改变任何消息形式以保护它不被任何人阅读的过程。在对称密钥加密中，消息是使用密钥加密的，并且使用相同的密钥来解密消息，这使得它易于使用但安全性较低。它还需要一种安全的方法将密钥从一方转移到另一方。
非对称密钥加密：
非对称密钥加密基于公钥和私钥加密技术。它使用两个不同的密钥来加密和解密消息。它比对称密钥加密技术更安全，但速度要慢得多。
| Symmetric Key Encryption | Asymmetric Key Encryption |
|---|---|
| It only requires a single key for both encryption and decryption. | It requires two key one to encrypt and the other one to decrypt. |
| The size of cipher text is same or smaller than the original plain text. | The size of cipher text is same or larger than the original plain text. |
| The encryption process is very fast. | The encryption process is slow. |
| It is used when a large amount of data is required to transfer. | It is used to transfer small amount of data. |
| It only provides confidentiality. | It provides confidentiality, authenticity and non-repudiation. |
| Examples: 3DES, AES, DES and RC4 | Examples: Diffie-Hellman, ECC, El Gamal, DSA and RSA |
| In symmetric key encryption, resource utilization is low as compared to asymmetric key encryption. | In asymmetric key encryption, resource utilization is high. |
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