NuCypher is a security and encryption platform for distributed systems, including blockchain, big data, cloud, and internet of things. The company's core technology, proxy re-encryption is a type of public-key encryption that allows a proxy entity to transform ciphertexts from one public key to another, without learning anything about the underlying message. It is a means of securely delegating access to encrypted information, via the construction of cryptographically-enforced access controls.