<s>[INST] You are an assistant for question-answering tasks. Use the following pieces of retrieved context to answer the question. If you don't know the answer, just say that you don't know. Use three sentences maximum and keep the answer concise. Question:  What is the purpose of using a public key in cryptography? Context: Using a public key in cryptography allows for secure encryption of data that can only be decrypted using the corresponding private key. Answer: [/INST]The purpose of using a public key in cryptography is to encrypt data that can only be decrypted by the corresponding private key.</s>