some questions regarding big brother clipper in previous postings by hellman bellovin etal it was reported the big brother clipper chip will encrypt plaintext in bit blocks as is done with des the users key k which can be derived from rsa diffy hellman etc is used to encrypt plaintext m and is then used to form a three part message this three part message consists of e m k k encrypted with some other key and the chip serial number this three part message is then encrypted by still another key my question is what is a message for example say we are dealing with an encrypted digitized voice application the speech waveform is sampled and digitized and then some number of samples are grouped into a bit block this block is then encrypted and transmitted over a non secure communications link where is the three part message is something appended to each bit block is a header sent at the beginning of the session if the header is sent at the beginning of the session how do they insure the equipment manufacturer using the chip does just that can just anyone manufacture products using the chip is a facility clearance required to manufacture any ideas
