SKIP Simple Key Management for Internet Protocols -
A key management protocol developed by Sun Microsystems that allows un-modified applications to utilize encryption and/or authentication to secure communications over IP networks. An Internet host can send an encrypted packet to another host without requiring a prior message exchange to set up a secure channel. Its advantages include absence of setup overhead and support for unidirectional IP and scalable multi-cast key distribution. SKIP's approach is burdened by the addition of an extra intermediate header of perhaps 20 to 28 bytes to every protected packet, which doubles the bandwidth overhead of protected traffic compared with ESP. Also see ISAKMP.