Subject: Slide presented at White House briefing on Clipper Chip

From: Clipper Chip Announcement <[email-masked]>
Date: Mon, 19 Apr 93 9:21:53 EDT [RISKS-14.51]

Note:     The following material was handed out a press briefing on the
          Clipper Chip on 4/16.

                              Chip Operation

                         Microchip
User's Message      +----------------------+
------------------> |                      |      1.  Message encrypted
                    | Encryption Algorithm |          with user's key
                    |                      |
                    | Serial #             |      2.  User's key encrypted
                    |                      |-->       with chip unique key
                    | Chip Unique Key      |
User's Encryption   |                      |      3.  Serial # encrypted
Key                 | Chip Family Key      |          with chip family key
------------------> |                      |
                    |                      |
                    +----------------------+

              For Law Enforcement to Read a Suspect's Message

1.  Need to obtain court authorized warrant to tap the suspect's telephone.

2.  Record encrypted message

3.  Use chip family key to decrypt chip serial number

4.  Take this serial number *and* court order to custodians 
    of disks A and B

5.  Add the A and B components for that serial number = the chip
    unique key for the suspect user

6.  Use this key to decrypt the user's message key for 
    this recorded message

7.  Finally, use this message key to decrypt the recorded message.