ELCRODAT 6-2 provides secure transmission of classified information up to TOP SECRET. It can be used for all ISDN basic services, even via satellite links (Inmarsat M4), e.g. for: Voice / Data / Fax (group 4) /Video conferences The ELCRODAT6-2 system is available in two versions: ELCRODAT6-2S for secure Euro-ISDN basic rate access (S0 bus/port) ELCRODAT6-2M for secure Euro-ISDN primary rate access (S2M port) As a supplement to existing Euro-ISDN terminals or PBXs, the ELCRODAT6-2Sis the ideal solution for secure voice and data communication at every level from UNCLASSIFIED to TOP SECRET. It can be used in conjunction with up to eight commercial ISDN terminals or with a PBX. The exchange access is either direct via the S0 basic rate interface or via a PBX. The ELCRODAT 6-2 is the first encryption unit approved by the German Information Security Agency for the transmission of information classified up to TOP SECRET which uses a public key method for key distribution. In conjunction with the public key method, the noise generator implemented in the encryption unit permits mutual authentication and key agreement. New session keys are generated in the encryption unit for each connection. They do not leave the units and are deleted after the session, thus ensuring maximum security.