Shared key encryption using long keypads

Details Shared key encryption using long keypads Shared key encryption using long keypads

2005-09-30

2011-11-01

Arani, Taghi (Department: 2438)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C380S262000, C380S280000, C713S150000, C713S171000, C708S250000, C708S251000, C708S300000

Reexamination Certificate

active

08050405

ABSTRACT:
Methods of securely communicating a message from a first terminal to a second terminal include generating a keypad including a random sequence of bits having a length L, encrypting the message at the first terminal using a bit string beginning at an offset O in the keypad, and transmitting the encrypted message and an indicator of the offset O to the second terminal. A communication terminal includes a controller, a communication module configured to establish a location-limited communication channel, and an encryption unit configured to store a keypad including a random sequence of bits having a length L, to encrypt an outgoing message using the keypad, and to decrypt an incoming message using the keypad.

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