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In this tutorial, we start by reviewing encryption techniques and introduce digital certificates. There are two types of encryption systems: symmetric and public key infrastructure (PKI). Symmetric encryption uses the same key for encryption and decryption, with a key size of 256 bits providing strong security. However, key distribution is a challenge. PKI uses two keys based on prime numbers, offering a different process for encryption. This system, called PKI, ensures secure communication by using two keys for encryption and decryption.