Patent ID: 7242770

Claim:
A secure communication system for an elevator information or control system comprising: a primary controller wherein the primary controller includes: at least one block of data assembled into unencrypted N-bits of information, an encryption routine including an encryption algorithm for encoding the data into at least one block of encrypted M-bits of information; a data encryption mask directing the encryption routine for placing the N-bits of information into M-bits of information; and a transmitter for transmitting encrypted data from the primary controller; wherein the at least one block of M-bits of information is three scattered packets of information, and wherein the at least one block of data assembled into unencrypted N-bits of information is three blocks of separate unencrypted information wherein the at least one block of N-bits of information is three basic packets of information and wherein the three basic packets of information are a floor packet, a message packet and a travel packet; and wherein the at least one block of M-bits of information comprises a start bit, type nibble, decoding key bit, encrypted data, decoding key bit, checksum, and a stop bit.