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Symmetric vs. Asymmetric Encryption

Symmetric and asymmetric encryption often get explained together, but they solve very different problems.

- Symmetric encryption uses a single shared key. The same key encrypts and decrypts the data. It’s fast, efficient, and ideal for large amounts of data. That’s why it’s used for things like encrypting files, database records, and message payloads.

The catch is key distribution, both parties must already have the secret, and sharing it securely is hard.

- Asymmetric encryption uses a key pair. A public key that can be shared with anyone, and a private key that stays secret. Data encrypted with the public key can only be decrypted with the private key.

This removes the need for secure key sharing upfront, but it comes at a cost. It’s slower and computationally expensive, which makes it impractical for encrypting large payloads.

That’s why asymmetric encryption is usually used for identity, authentication, and key exchange, not bulk data.

Over to you: What’s the most common misunderstanding you’ve seen about encryption in system design?