<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 concept of public key cryptography ? Context: Public key cryptography utilizes asymmetric key pairs for encryption and decryption purposes. Answer: [/INST]Public key cryptography involves the use of asymmetric key pairs, where one key is used for encryption and the other key is used for decryption.</s>