Symmetric cipher: same key works for encrypting and decrypting. The goal of a practical cipher is to be computationally infeasible to ‘crack’, i.e. decrypt without the key while being affordable to encode or decode with a reasonably sized key.
Symmetric cipher: same key works for encrypting and decrypting. The goal of a practical cipher is to be computationally infeasible to ‘crack’, i.e. decrypt without the key while being affordable to encode or decode with a reasonably sized key.