There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

The objective of this paper is to give a comprehensive introduction to applied cryptography with an engineer or computer scientist in mind. The emphasis is on the knowledge needed to create practical systems which supports integrity, confidentiality, or authenticity. Topics covered includes an introduction to the concepts in cryptography, attacks against cryptographic systems, key use and handling, random bit generation, encryption modes, and message authentication codes. Recommendations on algorithms and further reading is given in the end of the paper. This paper should make the reader able to build, understand and evaluate system descriptions and designs based on the cryptographic components described in the paper.

[서평]「Applied Cryptography」

Object-oriented analysis

The Convolution Transform. By Hirschmann & Widder . Pp. x + 268. 45s. 1955. (Princeton University Press. London : Cumberlege)

There is no escaping fact that a huge amount of unexploited resources lies underwater which covers almost 70% of the Earth. Yet, the aquatic world has mainly been unaffected by the recent advances in the area of wireless sensor networks (WSNs) and their pervasive penetration in modern day research and industrial development. The current pace of research in the area of underwater sensor networks (UWSNs) is slow due to the difficulties arising in transferring the state-of-the-art WSNs to their underwater equivalent. Maximum underwater deployments rely on acoustics for enabling communication combined with special sensors having the capacity to take on harsh environment of the oceans. However, sensing and subsequent transmission tend to vary as per different subsea environments; for example, deep sea exploration requires altogether a different approach for communication as compared to shallow water communication. This paper particularly focuses on comprehensively gathering most recent developments in UWSN applications and their deployments. We have classified the underwater applications into five main classes, namely, monitoring, disaster, military, navigation, and sports, to cover the large spectrum of UWSN. The applications are further divided into relevant subclasses. We have also shown the challenges and opportunities faced by recent deployments of UWSN.

https://journals.sagepub.com/doi/pdf/10.1155/2015/896832

Underwater sensor network applications: a comprehensive survey

This work investigates whether a contactless, wireless underwater coupling could be developed for underwater sensor networks. This requires the wireless transmission of power from the sensor hub to the transducer module, and the two-way wireless data communication between hub and transducer. Results from a trial deployment of systems with conventional waterproof couplings show that these are a major shortcoming of existing systems. Experiments are conducted which demonstrate that a Zigbee transceiver, operating in the 2.4GHz band, can communicate with low error rates up to 40mm at low RF power (-25dBm) and up to 70mm at higher power (-3 dBm) in seawater. Ranges are slightly higher in fresh water. Inductive power transfer, using a split transformer design, can transmit low power, in the 50-100mW range with efficiency of approximately 50%, demonstrating that wireless sensor couplings are feasible.

Wireless underwater power and data transfer

Getting into the mind of an “in-auction” fraud perpetrator

Phishing is an online scam used to dupe people out of their personal information for the purpose of defrauding them. This paper presents a conceptual design for removing phishing pages that have been uploaded on a website, potentially without knowledge of the website owner or host server. Initially the system is alerted to the presence of a phishing page upon receiving the Phisher’s solicitation e-mail. Next the system retrieves the location, IP address and contact information of the host server using a tracking program. Finally, the system sends notification to the Administrator about the phishing page on its server. It is then up to the host server Administrator to remove the phishing page from its server, or face the possibility of criminals continuing to use their site. This approach acts as the basis for further development into proactively (or aggressively) attacking Phishers directly, rather than being a reactionary approach that is common to most email filters and anti-virus software.

/pdf/a-proactive-approach-to-preventing-phishing-attacks-using-xl0pu4wh33.pdf

A Proactive Approach to Preventing Phishing Attacks Using Pshark

This paper presents a secure real time remote user authentication system based on dynamic handwritten signature
verification. The system allows users to establish their identities to other parties in real-time via a trusted
verification server. The system can be used to gain remote access to restricted content on a server or to verify
a signature on a legal document. State of the art dynamic verification techniques are combined with proven
cryptographic methods to develop a secure model for remote handwritten signature verification.

/pdf/remote-handwritten-signature-authentication-34l0tlbff0.pdf

Remote handwritten signature authentication

This paper describes a system for performing handwritten signature verification using complementary statistical models. The system analyses both the static features of a signature (e.g., shape, slant, size), and its dynamic features (e.g., velocity, pen-tip pressure, timing) to form a judgment about the signer’s identity. This approach’s novelty lies in combining output from existing Neural Network and Hidden Markov Model based signature verification systems to improve the robustness of any specific approach used alone. The system performs reasonably well and achieves an overall error rate of 2:1% in the best case. The results of several other experiments are also presented including using less reference signatures, allowing multiple signing attempts, zero- effort forgery attempts, providing visual feedback, and signing a password rather than a signature.

/pdf/handwritten-signature-verification-using-complementary-juic2oxoak.pdf

Jarrod Trevathan

Papers

Wireless underwater power and data transfer

Getting into the mind of an “in-auction” fraud perpetrator

A Proactive Approach to Preventing Phishing Attacks Using Pshark

Remote handwritten signature authentication

Handwritten signature verification using complementary statistical models