APPARATUS AND METHOD FOR SECURE COMMUNICATION ON A COMPOUND CHANNEL

摘要

The anti-diversity concept for secure communication on a two-link compound channel provides secure communication over two parallel communication channels. The message is split into two separate bit sequences by a source splitter. An error correction encoder (110) is applied to the two bit sequences to provide two code words for two channels (122, 124), such that left and right halves of an error correction code matrix respectively corresponds to the two parallel signal channels (122, 124). For the left half of the error correction code matrix, an upper left matrix block is a random permutation matrix, an upper right block is the identity matrix, and the bottom right matrix block is a random matrix of column and row weight greater than or equal to one. The bottom left matrix block is a column permutation of the bottom right, random matrix block. The right half error correction code matrix is a similar, symmetric structure.

主权项

1. An encryption method for secure communication, comprising the steps of:
dividing a message into first and second bit sequences with a source splitter; error correction encoding each of the first and second bit sequences to generate an error correction code matrix, wherein a left half of the error correction code matrix corresponds to a first signal channel and a right half of the error correction code matrix corresponds to a second signal channel, wherein an upper left matrix block of the left half of the error correction code matrix is a random permutation matrix, an upper right block of the left half of the error correction code matrix is an identity matrix, a bottom right matrix block of the left half of the error correction code matrix is a random matrix of column and row weight greater than or equal to one, and a bottom left matrix block of the left half of the error correction code matrix is a column permutation of the bottom right random matrix block of the left half of the error correction code matrix, the left half of the error correction code matrix having first and second checknodes; switching the first and second checknodes of the left half of the error correction code matrix and generating the right half of the error correction code matrix from the left half of the error correction code matrix following the switching of the first and second checknodes thereof; and transmitting the error correction encoded first and second bit sequences respectively over the first and second signal channels.