[sci.crypt] Lower layer security

bds@lzaz.ATT.COM (B.SZABLAK) (07/13/89)

There has been mention about encrypting data transmissions at lower layers
(e.g. between transport and network), and I thought I would ask the
experts to comment on the extent to which encrypting the PCI (assumed to
be easily guessed by the interceptor of the communication) compromises the
security of the encryption.