Symmetric Cryptography

cryptography

Definition

Symmetric Cryptography

Symmetric cryptography is the branch of cryptography in which cryptographic operations (e.g. encryption and decryption) use the same key.

Communication

When $N$ communication parties want to communicate with each other, they require $\frac{N(N-1)}{2}$ keys. Each party needs $N-1$ keys that must be shared in a secure way. This process must be repeated every time the key is refreshed.