We are pleased to announce the newest release of our domestic source reference implementation into the public domain.
From this public domain source release, you can build a fully functional IP-layer encryption and authentication package with full key management. Both FreeBSD 2.1.0 and SunOS 4.1.3 are supported in this release. DES, triple-DES and SAFER are supported for encryption and keyed-MD5 is supported for authentication.
This source produces a package which contains a loadable module which works with existing TCP/IP stacks. You do not need to replace (or even recompile) your IP stack to use this package. SKIP encrypts traffic at the IP packet layer. Applications do not need to be recompiled or modified to take advantage of encryption. Source and pre-built binaries (for FreeBSD 2.1.0) may be obtained by US and Canadian citizens from http://skip.incog.com/ This software may be used without restriction, for commercial and/or non-commercial purposes. Features of this release ------------------------ o Support for FreeBSD2.1.0 o SKIP V2 compliant implementation using ESP and AH encapsulation. o Support for Authentication using keyed-MD5. o Support for DES, 3DES, and SAFER 128SK for traffic and key encryption. o Support for nomadic users o Support for multiple local identities with different sets of parameters. o Support for multiple CA (Certificate Authority) certificates. o Transport mode is supported. o New Certificate Discovery protocol. o Highly configurable key manager. o Support for RAW AH and ESP protocols. o Diffie-Hellman Public Key Agreement based system. o Support for multiple NSIDs and multiple local certificates. o GUI tool for user friendly manipulation of access control lists and key statistics. o Command line tools for manipulating access control lists, etc. o Implementation of the Certificate Discovery protocol fully integrated into SKIP. o Implementation of X.509 public key certificates. o Implementation of DSA signature algorithm for certificate signatures. o Implementation for MD2, MD5 and SHA message digest algorithms. o Implementation of ASN.1 DER encoding/decoding. o SunScreen(tm) SKIP compatibility mode. o Implementation of hashed public keys as defined in the SKIP draft. Implementation of programs to generate hashed public keys, to convert X.509 Certificates to hashed keys and print both X.509 and Hashed certificates. o High performance Big Number library for Diffie-Hellman calculations. o Implementation is effectively "public domain" and may be used both commercially and non-commercially. o Patent Agreement with Cylink allows royalty-free use of the Diffie-Hellman and other Stanford patents with this package for commercial and non-commercial use. Read README.PATENT for some restrictions. o Inclusion of prime generation program used to generate the primes in SKIP draft.