• Symmetric (secret key) cryptography: Is encrypted using a single key to encrypt and decrypt. Stronger to keep data safe. Cheap and quick computationally.
  • Asymmetric cryptography (public key): System that uses pairs of keys public and private key pairs. Encrypt with the private key and vice versa - encrypt the smallest amount of data - take transaction - make a hash and then encrypt the hash. E.g. e-signatures
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