Data encryption of optical fibre communication using pseudo-random spatial light modulation

Encryption using pseudo random permutation

Data encryption is to conceal the information content of secret data. It is different from data hiding where the objective is to conceal the existence of secret data. A reversible data encryption technique can extract intended information content from the encrypted data without any loss of information. The decryption process should be done at legitimate or authentic receiver end. The encrypted ...

Pseudo-random Phase Precoded Spatial Modulation

Spatial modulation (SM) is a transmission scheme that uses multiple transmit antennas but only one transmit RF chain. At each time instant, only one among the transmit antennas will be active and the others remain silent. The index of the active transmit antenna will also convey information bits in addition to the information bits conveyed through modulation symbols (e.g., QAM). Pseudo-random p...

A Pseudo-Random Encryption Mode

Block ciphers are length-preserving private-key encryption schemes. I.e., the private key of a block-cipher determines a permutation on strings of the length of its input. This permutation is used for encryption while the inverse permutation is used for decryption. Using a length-preserving encryption scheme saves on memory and prevents wasting communication bandwidth. Furthermore, it enables t...

Optical Data Storage and Signal Processing Using Spatial Phase Modulation of Light Ph.D. thesis

Enhanced Spatial Modulation of Indoor Visible Light Communication

In this study, we consider visible light communication in an indoor line-of-sight environment. It has been proved that among the multiple input multiple output (MIMO) techniques, spatial modulation (SM) performs better than repetition coding (RC) and spatial multiplexing (SMP). On the basis of a combination of SM and pulse amplitude modulation (PAM), here, we propose an enhanced SM algorithm to...