US Patent No. 9,596,075

TRANSPARENT SERIAL ENCRYPTION


Patent No. 9,596,075
Issue Date March 14, 2017
Title Transparent Serial Encryption
Inventorship Richard Norman Winslow, Wilmington, DE (US)
Todd David Heinrich, Garnet Valley, PA (US)
Steven Daniel Devlin, Pitman, NJ (US)
Frank Anthony Costantini, Woolwich Township, NJ (US)
Assignee L3 Technologies, Inc., New York, NY (US)

Claim of US Patent No. 9,596,075

1. An encryption device comprising:
a first communication interface configured to receive a serial data stream;
a processor configured to:
generate a keystream using a block cipher operating in counter mode, wherein the keystream is generated based on at least
a key value and a count value,

encrypt the serial data stream using the keystream,
detect an idle period in the serial data stream,
insert a framed cryptographic synchronization message into the encrypted serial data stream at a position corresponding to
the detected idle period, wherein the framed cryptographic synchronization message comprises an escape sequence and an indication
of a count value to be used to generate keystream data; and

a second communication interface configured to output the encrypted serial data and the framed cryptographic synchronization
message.