Computer Science – 6.1 Data Security | e-Consult

Symmetric Encryption: In symmetric encryption, the same key is used for both encryption and decryption. This makes it significantly faster than asymmetric encryption. A common symmetric encryption algorithm is Advanced Encryption Standard (AES). AES is widely used for encrypting large amounts of data, such as files stored on a hard drive or data transmitted over a secure communication channel (e.g., TLS/SSL). A scenario where symmetric encryption is appropriate is encrypting a large database where speed is crucial.

Asymmetric Encryption: Asymmetric encryption uses 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 must be kept secret. A common asymmetric encryption algorithm is RSA (Rivest-Shamir-Adleman). RSA is typically used for secure key exchange, digital signatures, and encrypting small amounts of data like passwords. A scenario where asymmetric encryption is appropriate is securing a website's HTTPS connection, where the server's public key is used to encrypt the session key, and the client's private key is used to decrypt it.

Here's a table summarizing the key differences: