355 research outputs found
Towards a Quantum Steganographic Capacity of Lossy Bosonic Channels
Quantum steganography is the extension of steganography to the quantum setting, wherein a quantum protocol (e.g.: a quantum error-correcting code) is used to hide classical or quantum information. Because of the unique nature of quantum states and channels, quantum steganography can be stronger than classical steganography. A lot of effort has been devoted to characterizing how much information can be embedded into various quantum channels with or without noise, and recently, several quantum steganography protocols have been developed and analyzed that improve on earlier work by exploiting a concept known in information theory as channel resolvability. This paper first provides a concise background survey of specific topics from relevant disciplines in classical as well as quantum information theory, and then presents a formulation of the problem concerning the characterization of the steganographic capacity for a specific type of quantum channel called the lossy bosonic channel.Undergraduat
Perfectly secure steganography: hiding information in the quantum noise of a photograph
We show that the quantum nature of light can be used to hide a secret message
within a photograph. Using this physical principle we achieve
information-theoretic secure steganography, which had remained elusive until
now. The protocol is such that the digital picture in which the secret message
is embedded is perfectly undistinguishable from an ordinary photograph. This
implies that, on a fundamental level, it is impossible to discriminate a
private communication from an exchange of photographs.Comment: 5 pages, 3 figures + appendix : 5 pages, 6 figure
Review on DNA Cryptography
Cryptography is the science that secures data and communication over the
network by applying mathematics and logic to design strong encryption methods.
In the modern era of e-business and e-commerce the protection of
confidentiality, integrity and availability (CIA triad) of stored information
as well as of transmitted data is very crucial. DNA molecules, having the
capacity to store, process and transmit information, inspires the idea of DNA
cryptography. This combination of the chemical characteristics of biological
DNA sequences and classical cryptography ensures the non-vulnerable
transmission of data. In this paper we have reviewed the present state of art
of DNA cryptography.Comment: 31 pages, 12 figures, 6 table
A Comparison of Cryptography Courses
The author taught two courses on cryptography, one at Duke University aimed
at non-mathematics majors and one at Rose-Hulman Institute of Technology aimed
at mathematics and computer science majors. Both tried to incorporate technical
and societal aspects of cryptography, with varying emphases. This paper will
discuss the strengths and weaknesses of both courses and compare the
differences in the author's approach.Comment: 14 pages; to appear in Cryptologi
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