Patent ID: 7088826

Claim:
A method for providing a crypto key and an associated checkword of said crypto key to an encryption device for a telemeter system of a missile, comprising the steps of: (a) storing said crypto key and said associated checkword in a key loader; (b) sending a first variable request signal to said key loader to initiate a transfer of said crypto key and said associated checkword from said key loader to a microcontroller for storage within said microcontroller; (c) storing said crypto key and said associated checkword in an EEPROM within said microcontroller, said microcontroller containing a computer software program for controlling, handling and interpreting the transfer of said crypto key and said associated checkword from said key loader to said microcontroller, and the storing of said crypto key and said associated checkword in the EEPROM of said microcontroller; (d) sending a sense in signal to said encryption device to initiate a load of said crypto key and said associated checkword into said encryption device; (e) receiving a second variable request signal from said encryption device to initiate a transfer and download of said crypto key and said associated checkword from the EEPROM of said microcontroller to said encryption device; (f) loading said crypto key and said associated checkword into said encryption device, said computer software program controlling, handling and interpreting the transfer and download of said crypto key and said associated checkword into said encryption device from the EEPROM of said micrcontroller; (g) providing a transmitter disable signal to a transmitter for the telemeter system of said missile to disable said transmitter when said crypto key and said associated checkword are being loaded into said encryption device preventing said crypto key and said associated checkword from being transmitted by said transmitter; and (h) enabling said transmitter after a successful load of said crypto key and said associated checkword into said encryption device, said computer software program controlling, handling and interpreting the disabling of said transmitter when said crypto key and said associated checkword are loaded into said encryption device and an enabling of said transmitter after the successful load of said crypto key and said associated checkword into said encryption device.