Symmetry and Asymmetry in Cryptography, Second Edition

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Computer".

Deadline for manuscript submissions: closed (31 March 2025) | Viewed by 916

Special Issue Editors


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Guest Editor
Faculty of Education and Integrated Arts and Sciences, Waseda University, Shinjuku, Tokyo 169-8050, Japan
Interests: theory of cryptography; randomness and computation; quantum computation; computational complexity
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Guest Editor
1. Vlatacom Institute of High Technology, Milutina Milankovica 5, 11070 Belgrade, Serbia
2. Technical Faculty, Singidunum University, Belgrade, Serbia
Interests: Artificial Intelligence; signal processing; cryptology; machine learning; cryptanalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Due to the great success of our Special Issue "Symmetry and Asymmetry in Cryptography" we decided to set up a second volume.

Symmetry and asymmetry represent the basic nature of cryptography. Therefore, the additional symmetric/asymmetric properties of cryptographic schemes should be discussed. Alternatively, the essential usage of techniques based on symmetry or asymmetry should be considered. We solicit contributions not only on computational cryptography, but also information-theoretic or quantum cryptography.

Prof. Dr. Takeshi Koshiba
Prof. Dr. Milan Milosavljević
Guest Editors

Manuscript Submission Information

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Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Symmetry is an international peer-reviewed open access monthly journal published by MDPI.

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Keywords

  • cryptosystems
  • cryptanalysis
  • cryptographic protocols
  • quantum cryptography
  • information theoretic
  • cryptography
  • machine learning over encrypted data
  • data security with cryptography
  • cloud computing security

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Published Papers (1 paper)

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Research

29 pages, 9545 KiB  
Article
A Class of Perfectly Secret Autonomous Low-Bit-Rate Voice Communication Systems
by Jelica Radomirović, Milan Milosavljević, Sara Čubrilović, Zvezdana Kuzmanović, Miroslav Perić, Zoran Banjac and Dragana Perić
Symmetry 2025, 17(3), 365; https://doi.org/10.3390/sym17030365 - 27 Feb 2025
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Abstract
This paper presents an autonomous perfectly secure low-bit-rate voice communication system (APS-VCS) based on the mixed-excitation linear prediction voice coder (MELPe), Vernam cipher, and sequential key distillation (SKD) protocol by public discussion. An authenticated public channel can be selected in a wide range, [...] Read more.
This paper presents an autonomous perfectly secure low-bit-rate voice communication system (APS-VCS) based on the mixed-excitation linear prediction voice coder (MELPe), Vernam cipher, and sequential key distillation (SKD) protocol by public discussion. An authenticated public channel can be selected in a wide range, from internet connections to specially leased radio channels. We found the source of common randomness between the locally synthesized speech signal at the transmitter and the reconstructed speech signal at the receiver side. To avoid information leakage about open input speech, the SKD protocol is not executed on the actual transmitted speech signal but on artificially synthesized speech obtained by random selection of the linear spectral pairs (LSP) parameters of the speech production model. Experimental verification of the proposed system was performed on the Vlatacom Personal Crypto Platform for Voice encryption (vPCP-V). Empirical measurements show that with an adequate selection of system parameters for voice transmission of 1.2 kb/s, a secret key rate (KR) of up to 8.8 kb/s can be achieved, with a negligible leakage rate (LR) and bit error rate (BER) of order 103 for various communications channels, including GSM 3G and GSM VoLTE networks. At the same time, by ensuring perfect secrecy within symmetric encryption systems, it further highlights the importance of the symmetry principle in the field of information-theoretic security. To our knowledge, this is the first autonomous, perfectly secret system for low-bit-rate voice communication that does not require explicit prior generation and distribution of secret keys. Full article
(This article belongs to the Special Issue Symmetry and Asymmetry in Cryptography, Second Edition)
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