What kind of cryptography?

Cryptography can be broadly categorized into symmetric and asymmetric cryptography. Symmetric cryptography uses the same key for both encryption and decryption, making it fast but requiring secure key distribution. Asymmetric cryptography, on the other hand, employs a pair of keys: a public key for encryption and a private key for decryption, enhancing security but typically being slower. Additionally, there are other forms like hash functions and digital signatures, each serving specific purposes in securing data and communications.