Abstract
We present different optical secure point-to-point transmission schemes
using a planar multiport encoder/decoder. We consider both bit- and block-cipher
cryptography: in the first case, each bit (both mark and space) from each
user is encoded in a two-key optical code-division multiplexing signal. Block-cipher
cryptography encodes a stream of <i>N</i> bits into a single code and corresponds to optical <i>M</i>-ary transmission. We demonstrate that block-ciphers
are more secure with respect to bit-ciphers schemes and also against known-plaintext
and chosen-plaintext attacks.
© 2008 IEEE
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