S-HTTP (Secure Hypertext Transfer Protocol) is an extension to HTTP (Hypertext Transfer Protocol) that provides security services. It was originally developed by Enterprise Integration Technologies, and further development continues at Terisa Systems. HTTP is the protocol that forms the basis of the World Wide Web, allowing the exchange of multimedia documents on the Web. S-HTTP is designed to provide confidentiality, authenticity, integrity, and non-repudiability while supporting multiple key management mechanisms and cryptographic algorithms via option negotiation between the parties involved in each transaction.