Boneh-Franklin IBE

There has been an unprecedented rise in insecure computer networks in the last few decades. This has led to a rise in the need for large-scale cryptography to improve security. Public key encryption is a relatively new concept that has risen in prominence due to the limitations in the more traditional symmetric cryptographic methods like key management which becomes impractical when used at a large scale. Identity-based encryption (IBE) systems are defined as a category of public key encryption wherein the user’s public key is derived from a distinctive identity of a user (for example, email ID). In this chapter, we will talk about the first IBE scheme with the comprehensive analysis that will include reviewing all the four stages involved: setup, extract, encrypt, and decrypt. We will also discuss the different conceptions of security, such as chosen ciphertext security and semantically secure identity-based systems, with detailed examination about the security of this scheme.