Cryptographic synchronization recovery by measuring randomness of decrypted data

Patent · Mon Jan 01 00:00:00 EST 1990

OSTI ID:867646

Maestas, Joseph H ^[1]; Pierson, Lyndon G ^[1]

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1. Albuquerque, NM

The invention relates to synchronization of encrypted data communication systems and a method which looks for any lack of pattern or intelligent information in the received data and triggers a resynchronization signal based thereon. If the encrypter/decrypter pairs are out of cryptographic synchronization, the received (decrypted) data resembles pseudorandom data. A method and system are provided for detecting such pseudorandom binary data by, for example, ones density. If the data is sufficiently random the system is resynchronized.

• Research Organization: AT&T
• DOE Contract Number: AC04-76DP00789
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4977596
• OSTI ID: 867646
• Country of Publication: United States
• Language: English

Related Subjects

cryptographic
synchronization
recovery
measuring
randomness
decrypted
data
relates
encrypted
communication
systems
method
looks
lack
pattern
intelligent
information
received
triggers
resynchronization
signal
based
thereon
encrypter
decrypter
pairs
resembles
pseudorandom
provided
detecting
binary
example
ones
density
sufficiently
random
resynchronized
signal based
based thereon
received data
sufficiently random
binary data
communication systems
data communication
encrypted data
/380/370/375/