Below is the information NCSA/EIT sent me about S-HTTP, you can skip the press release at the end if you have already read it. It was posted to the list a short while ago. Vaccinia@UNCVX1.oit.unc.edu Thank you for your inquiry regarding Secure HTTP. This message provides some details on the protocol and the status of its implementation. The April 12th joint EIT/NCSA/RSA press release regarding Secure Mosaic is included at the end of the message. OVERVIEW OF S-HTTP We have developed a new protocol for dealing with a wide range of cryptographic modes and algorithms in the context of the World-Wide Web, based on the Web's existing HyperText Transfer Protocol (HTTP). We call this protocol "Secure HTTP" or "S-HTTP". This protocol has been designed to enable incorporation of various cryptographic message format standards into Web clients and servers, including, but not limited to PKCS-7, PEM, and PGP. S-HTTP supports interoperation among a variety of implementations, and is backwards compatible with HTTP. S-HTTP aware clients can talk to S-HTTP oblivious servers and vice-versa, although such transactions obviously would not use S-HTTP security features. IMPLEMENTATIONS AND LICENSING EIT will make available freely usable source code for implementing S-HTTP in both clients and servers. These reference implementations of "Secure NCSA Mosaic" and "Secure NCSA HTTPD" will support two crypto engine implementations: via an integrated TIPEM library (offering PKCS-7 support) and via an "outboard" RIPEM application. RSA has agreed to permit the distribution of their TIPEM library, in binary form, without charge in conjunction with the non-commercial distribution of NCSA Mosaic. Implementors of non-commercial clients or servers may wish to use the already available RIPEM system (which is itself based on RSA's RSAREF library). Commercial implementors or distributors of WWW clients and servers are encouraged to pursue licencing arrangements with RSA or their licencees. FEATURES OF S-HTTP S-HTTP does not require client-side public key certificates (or public keys), supporting a symmetric session key operation mode. This is significant because it means that secure, spontaneous transactions can occur without requiring individual users to have an established public key. While S-HTTP will be able to take advantage of a ubiquitious certification infrastructure, its deployment does not require it. S-HTTP supports end-to-end secure transactions, in contrast with current usage of the existing HTTP authorization protocol which requires the client to attempt access and be denied before the security mechanism is employed. Clients may be "primed" to initiate a secure transaction (typically using information supplied in an HTML anchor); this is used to support encryption of fill-out forms, for example. In S-HTTP, no sensitive data need ever be sent over the network in the clear. S-HTTP provides full flexibility of cryptographic algorithms, modes and parameters. Option negotiation is used to allow clients and servers to agree on transaction modes (should the the request be signed? encrypted? both? what about the reply?); cryptographic algorithms (RSA vs. DSA for signing, DES vs. RC4 for encrypting, etc.); and certificate selection (please sign with your "Mastercard certificate"). ABOUT PKCS-7 PKCS-7 is a cryptographic message syntax standard developed by a consortium of companies lead by RSA. PKCS-7 is compatible with the Internet standards for Privacy Enhanced Mail (PEM) in that signed-data and signed-and-enveloped-data content, constructed in a PEM-compatible mode, can be converted into PEM messages without any cryptographic operations. PEM messages can similarly be converted into the PKCS-7 signed-data and signed-and-enveloped-data content types. In other words, PKCS-7 and PEM implementations can interoperate. PKCS-7 has the following advantages: a) PKCS-7 permits transport of 8-bit data (contrast with PEM, which requires Base-64 encoding). b) PKCS-7 can have a signature-less mode of operation. This permits secure messages to be sent from senders who do not have RSA key pairs. Signature is mandatory under PEM. c) PKCS-7 permits more flexibility in certificate format and trust models. d) PKCS-7 is explicitly designed for algorithmic flexibility. New cryptosystems, message digest algorithms and signature schemes can be added just by defining new types. SCHEDULE An "alpha quality" implementation of Secure Mosaic and HTTPD was demonstrated in public on April 12th. The protocol document is to be sent for external review (to RSA, NCSA and TIS) at the end of April. After revision, we plan to submit it as an "experimental protocol" RFC -- by late May, we expect. The reference implementation will be supplied to beta testers (to the protocol reviewers, and selected CommerceNet sponsors). Public release (to CommerceNet participants) is scheduled for September. CommerceNet will operate a certification authority, suitable for operators of S-HTTP servers (open to CommerceNet participants), beginning at that time. We expect that NCSA will make the reference implementation available to the Internet community soon after. Periodic progress reports will be reported to Internet mailing lists (such as PEM-DEV), and available on the EIT and CommerceNet Web servers (URL's http://www.commerce.net/ and http://www.eit.com/). ORIGINAL PRESS RELEASE Secure NCSA Mosaic Establishes Necessary Framework for Electronic Commerce on the Internet PALO ALTO, Calif., April 12, 1994 -- Enterprise Integration Technologies (EIT), the National Center for Supercomputing Applications (NCSA) at the University of Illinois and RSA Data Security today announced agreements to jointly develop and distribute a secure version of NCSA Mosaic, the popular point-and-click interface that enables easy access to thousands of multimedia information services on the Internet. The announcement was made in conjunction with the launch of CommerceNet, a large-scale market trial of electronic commerce on the Internet. Under the agreements, EIT will integrate its Secure-HTTP software with public key cryptography from RSA into NCSA Mosaic Clients and World Wide Web (WWW) servers. WWW is a general-purpose architecture for information retrieval comprised of thousands of computers and servers that is available to anyone on Internet. The enhancements will then be made available to NCSA for widespread public distribution and commercial licensing. Jay M. Tenenbaum, chief executive officer of EIT, believes secure NCSA Mosaic will help unleash the commercial potential of the Internet by enabling buyers and sellers to meet spontaneously and transact business. "While NCSA Mosaic makes it possible to browse multimedia catalogs, view product videos, and fill out order forms, there is currently no commercially safe way to consummate a sale," said Tenenbaum. "With public key cryptography, however, one can authenticate the identity of trading partners so that access to sensitive information can be properly accounted for." This secure version of NCSA Mosaic allows users to affix digital signatures which cannot be repudiated and time stamps to contracts so that they become legally binding and auditable. In addition, sensitive information such as credit card numbers and bid amounts can be securely exchanged under encryption. Together, these capabilities provide the foundation for a broad range of financial services, including the network equivalents of credit and debit cards, letters of credit and checks. In short, such secure WWW software enables all users to safely transact day-to-day business involving even their most valuable information on the Internet. According to Joseph Hardin, director of the NCSA group that developed NCSA Mosaic, over 50,000 copies of the interface software are being downloaded monthly from NCSA's public server -- with over 300,000 copies to date. Moreover, five companies have signed license agreements with NCSA and announced plans to release commercial products based on NCSA Mosaic. "This large and rapidly growing installed base represents a vast, untapped marketplace," says Hardin. The availability of a secure version of NCSA Mosaic establishes a valid framework for companies to immediately begin large-scale commerce on the Internet." Jim Bidzos, president of RSA, sees the agreement as the beginning of a new era in electronic commerce, where companies routinely transact business over public networks. "RSA is proud to provide the enabling public key software technology and will make it available on a royalty-free basis for inclusion in NCSA's public distribution of NCSA Mosaic," said Bidzos. RSA and EIT will work together to develop attractive licensing programs for commercial use of public key technology in WWW servers." At the CommerceNet launch, Allan M. Schiffman, chief technical officer of EIT, demonstrated a working prototype of secure NCSA Mosaic, along with a companion product that provides for a secure WWW server. The prototype was implemented using RSA's TIPEM toolkit. "In integrating public key cryptography into NCSA Mosaic, we took great pains to hide the intricacies and preserve the simplicity and intuitive nature of NCSA Mosaic," explained Schiffman. Any user that is familiar with NCSA Mosaic should be able to understand and use the software's new security features. Immediately to the left of NCSA's familiar spinning globe icon, a second icon has been inserted that is designed to resemble a piece of yellow paper. When a document is signed, a red seal appears at the bottom of the paper, which the user can click on to see the public key certificates of the signer and issuing agencies. When an arriving document is encrypted, the paper folds into a closed envelope, signifying that its information is hidden from prying eyes. When the user fills out a form containing sensitive information, there is a 'secure send' button that will encrypt it prior to transmission. Distribution of Public Keys To effectively employ public-key cryptography, an infrastructure must be created to certify and standardize the usage of public key certificates. CommerceNet will certify public keys on behalf of member companies, and will also authorize third parties such as banks, public agencies, industry consortia to issue keys. Such keys will often serve as credentials, for example, identifying someone as a customer of a bank, with a guaranteed credit line. Significantly, all of the transactions involved in doing routine purchases from a catalog can be accomplished without requiring buyers to obtain public keys. Using only the server's public key, the buyer can authenticate the identity of the seller, and transmit credit card information securely by encrypting it under the seller's public key. Because there are far fewer servers than clients, public key administration issues are greatly simplified. Easy Access to Strong Security To successfully combine simplicity of operation and key administration functions with a high level of security that can be accessible to even non-sophisticated users, significant changes were necessary for existing WWW security protocols. EIT developed a new protocol called Secure-HTTP for dealing with a full range of modern cryptographic algorithms and systems in the Web. Secure-HTTP enables incorporation of a variety of cryptographic standards, including, but not limited to, RSA's PKCS-7, and Internet Privacy Enhanced Mail (PEM), and supports maximal interoperation between clients and servers using different cryptographic algorithms. Cryptosystem and signature system interoperation is particularly useful between U.S. residents and non-U.S. residents, where the non-U.S. residents may have to use weaker 40-bit keys in conjunction with RSA's RC2 (TM) and RC4 (TM) variable keysize ciphers. EIT intends to publish Secure-HTTP as an Internet standard, and work with others in the WWW community to create a standard that will encourage using the Web for a wide variety of commercial transactions. Availability EIT will make Secure NCSA Mosaic software available at no charge to CommerceNet members in September and NCSA will incorporate these secure features in future NCSA Mosaic releases. Enterprise Integration Technologies Corp., of Palo Alto, Calif., (EIT) is an R&D and consulting organization, developing software and services that help companies do business on the Internet. EIT is also project manager of CommerceNet. The National Center for Supercomputer Applications (NCSA), developer of the Mosaic hypermedia browser based at the University of Illinois in Champaign, Ill., is pursuing a wide variety of software projects aimed at making the Internet more useful and easier to use. RSA Data Security, Inc., Redwood City, Calif., invented Public Key Cryptography and performs basic research and development in the cryptographic sciences. RSA markets software that facilitates the integration of their technology into applications. Information on Secure NCSA Mosaic can be obtained by sending e-mail to shttp-info@eit.com. Press Contact: Nancy Teater Hamilton Communications Phone: (415) 321-0252 Fax: (415) 327-4660 Internet: nrt@hamilton.com