46 research outputs found
Turbo Codes Can Be Asymptotically Information-Theoretically Secure
This paper shows that a turbo-coded communication
system can be made secure with a little bit of complexity cost.
The classical permutation ciphers are revisited and analyzed.
Firstly, the ideal stream permutation ciphers are shown to be
asymptotically information-theoretically secure in the sense that
the channel from plaintext to ciphertext has a vanished capacity,
while the practical stream permutation ciphers are shown to
be more secure than the classical stream ciphers in terms of
protecting keys. Secondly, a necessary condition to break down
a block permutation cipher is derived, which is then utilized
to guarantee the computational security of a modified block
permutation cipher. Thirdly, turbo ciphers (turbo-like codes with
private interleavers) are proposed and analyzed
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Joint Schemes for Physical Layer Security and Error Correction
The major challenges facing resource constraint wireless devices are error resilience, security and speed. Three joint schemes are presented in this research which could be broadly divided into error correction based and cipher based. The error correction based ciphers take advantage of the properties of LDPC codes and Nordstrom Robinson code. A cipher-based cryptosystem is also presented in this research. The complexity of this scheme is reduced compared to conventional schemes. The securities of the ciphers are analyzed against known-plaintext and chosen-plaintext attacks and are found to be secure. Randomization test was also conducted on these schemes and the results are presented. For the proof of concept, the schemes were implemented in software and hardware and these shows a reduction in hardware usage compared to conventional schemes. As a result, joint schemes for error correction and security provide security to the physical layer of wireless communication systems, a layer in the protocol stack where currently little or no security is implemented. In this physical layer security approach, the properties of powerful error correcting codes are exploited to deliver reliability to the intended parties, high security against eavesdroppers and efficiency in communication system. The notion of a highly secure and reliable physical layer has the potential to significantly change how communication system designers and users think of the physical layer since the error control codes employed in this work will have the dual roles of both reliability and security
INForum 2017: Atas do Nono Simpósio de Informática
Este volume contém as atas da 9.a edição do Simpósio em Informática, INForum 2017, a qual decorreu
no Pavilhão de Exposições de Aveiro, em Aveiro, conjuntamente com o TechDays 2017, nos dias 12 e 13
de outubro de 2017. (...