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Cryptography
Cryptography, or cryptology (from Ancient Greek: "hidden, secret"; and γράφειν graphein, "to write", or -λογία -logia, "study", respectively), is the practice and study of techniques for secure communication in the presence of adversarial behavior. More generally, cryptography is about constructing and analyzing protocols that prevent third parties or the public from reading private messages. Modern cryptography exists at the intersection of the disciplines of mathematics, computer science, information security, electrical engineering, digital signal processing, physics, and others. Core concepts related to information security (data confidentiality, data integrity, authentication, and non-repudiation) are also central to cryptography. Practical applications of cryptography include electronic commerce, chip-based payment cards, digital currencies, computer passwords, and military communications. Cryptography prior to the modern age was effectively synonymous with encryption, converting readable information (plaintext) to unintelligible nonsense text (ciphertext), which can only be read by reversing the process (decryption). The sender of an encrypted (coded) message shares the decryption (decoding) technique only with intended recipients to preclude access from adversaries. The cryptography literature often uses the names "Alice" (or "A") for the sender, "Bob" (or "B") for the intended recipient, and "Eve" (or "E") for the eavesdropping adversary. Since the development of rotor cipher machines in World War I and the advent of computers in World War II, cryptography methods have become increasingly complex and their applications more varied. Modern cryptography is heavily based on mathematical theory and computer science practice; cryptographic algorithms are designed around computational hardness assumptions, making such algorithms hard to break in actual practice by any adversary. While it is theoretically possible to break into a well-designed system, it is infeasible in actual practice to do so. Such schemes, if well designed, are therefore termed "computationally secure"; theoretical advances (e.g., improvements in integer factorization algorithms) and faster computing technology require these designs to be continually reevaluated, and if necessary, adapted. Information-theoretically secure schemes that cannot be broken even with unlimited computing power, such as the one-time pad, are much more difficult to use in practice than the best theoretically breakable, but computationally secure, schemes. The growth of cryptographic technology has raised a number of legal issues in the Information Age. Cryptography's potential for use as a tool for espionage and sedition has led many governments to classify it as a weapon and to limit or even prohibit its use and export. In some jurisdictions where the use of cryptography is legal, laws permit investigators to compel the disclosure of encryption keys for documents relevant to an investigation. Cryptography also plays a major role in digital rights management and copyright infringement disputes in regard to digital media.
  • 3.1K
  • 28 Nov 2022
Topic Review
Social Robots in Special Education
In recent years, social robots have become part of a variety of human activities, especially in applications involving children, e.g., entertainment, education, companionship. The interest of this work lies in the interaction of social robots with children in the field of special education. 
  • 3.1K
  • 23 Jun 2021
Topic Review
Gaia Hypothesis
The Gaia hypothesis (/ˈɡaɪ.ə/), also known as the Gaia theory, Gaia paradigm, or the Gaia principle, proposes that living organisms interact with their inorganic surroundings on Earth to form a synergistic and self-regulating, complex system that helps to maintain and perpetuate the conditions for life on the planet. The hypothesis was formulated by the chemist James Lovelock and co-developed by the microbiologist Lynn Margulis in the 1970s. Lovelock named the idea after Gaia, the primordial goddess who personified the Earth in Greek mythology. The suggestion that the theory should be called "the Gaia hypothesis" came from Lovelock's neighbour, William Golding. In 2006, the Geological Society of London awarded Lovelock the Wollaston Medal in part for his work on the Gaia hypothesis. Topics related to the hypothesis include how the biosphere and the evolution of organisms affect the stability of global temperature, salinity of seawater, atmospheric oxygen levels, the maintenance of a hydrosphere of liquid water and other environmental variables that affect the habitability of Earth. The Gaia hypothesis was initially criticized for being teleological and against the principles of natural selection, but later refinements aligned the Gaia hypothesis with ideas from fields such as Earth system science, biogeochemistry and systems ecology. Even so, the Gaia hypothesis continues to attract criticism, and today many scientists consider it to be only weakly supported by, or at odds with, the available evidence.
  • 3.1K
  • 07 Nov 2022
Topic Review
Intelligent Road Defects Detection Technology
Road defects are important factors affecting traffic safety. In order to improve the identification efficiency of road diseases and the pertinence of maintenance and management, intelligent detection technologies of road diseases have been developed. The problems of high cost and low efficiency of artificial inspection of road diseases are solved efficiently, and the quality of road construction is improved availably. This is not only the guarantee of highway quality but also the guarantee of people’s lives and safety.
  • 3.1K
  • 15 Jun 2022
Topic Review
Nandigram Violence
Nandigram Violence was violence occurred in Nandigram, East Midnapore, West Bengal, India , in 2007 due to the land acquisition for a project by the Government of West Bengal led by the Communist Party of India (Marxist) to create special economic zone (SEZ). The policy led to an emergency in the region, and 14 people died in a police shooting. According to CID reports, the Nandigram violence saw a Maoist insurgency in the area[lower-alpha 1] during the protests. But West Bengal Home Secretary himself stated that the presence of Maoists could not be confirmed in Nandigram. The Central Bureau of Investigation later exonerated the Buddhadeb Bhattacharya government of responsibility for the shootings. But supporting the violence in Nandigram by his own party workers, Buddhadeb Bhattacharya had said earlier "They (the oppositions) have been paid back in the same coin."
  • 3.1K
  • 16 Nov 2022
Topic Review
Intercultural Competence
Intercultural competence is a range of cognitive, affective, and behavioural skills that lead to effective and appropriate communication with people of other cultures. Effective intercultural communication relates to behaviors that culminate with the accomplishment of the desired goals of the interaction and all parties involved in the situation. Appropriate intercultural communication includes behaviors that suit the expectations of a specific culture, the characteristics of the situation, and the level of the relationship between the parties involved in the situation. It also takes into consideration one's own cultural norms and the best appropriate, comfortable compromise between the different cultural norms. It's very important for someone to be culturally competent at work and at school. Individuals that are effective and appropriate in intercultural situations display high levels of cultural self-awareness and understand the influence of culture on behavior, values, and beliefs. Intercultural competence is achieved through a set of skills that includes cognitive, affective, and behavioral processes. Cognitive processes imply the understanding of situational and environmental aspects of intercultural interactions and the application of intercultural awareness, which is affected by the understanding of the self and own culture. Self-awareness in intercultural situations refers to the ability of self-monitoring in such interactions to censor anything not acceptable to another culture. On the other hand, cultural awareness leads the individual to an understanding of how his/her own culture determines feelings, thoughts, and personality. Affective processes define the emotions that span during intercultural interactions. These emotions are strongly related to self-concept, open-mindedness, non-judgementalism, and social relaxation. In general, positive emotions generate respect for other cultures and their differences. Behavioral processes refer to how effectively and appropriately the individual directs actions to achieve goals. Actions during intercultural interactions are influenced by the ability to clearly convey a message, proficiency with the foreign language, flexibility and management of behavior, and social skills.
  • 3.1K
  • 26 Oct 2022
Topic Review
Extreme Weather Events of 535–536
The extreme weather events of 535–536 were the most severe and protracted short-term episodes of cooling in the Northern Hemisphere in the last 2,000 years. The event is thought to have been caused by an extensive atmospheric dust veil, possibly resulting from a large volcanic eruption conjectured to be either in Asia, the Americas, Europe, or other locations. Its effects were widespread, causing unseasonable weather, crop failures, and famines worldwide.
  • 3.1K
  • 23 Nov 2022
Topic Review
Medical Robots
The combination of artificial intelligence technology and medical science has inspired the emergence of medical robots with novel functions that use new materials and have a neoteric appearance. 
  • 3.1K
  • 02 Jun 2021
Topic Review
Tesla Roadster (2008)
The Tesla Roadster is a battery electric vehicle (BEV) sports car, based on the Lotus Elise chassis, that was produced by the electric car firm Tesla Motors (now Tesla, Inc.) in California from 2008 to 2012. The Roadster was the first highway legal serial production all-electric car to use lithium-ion battery cells and the first production all-electric car to travel more than 320 kilometres (200 mi) per charge. It is also the first production car to be launched into orbit, carried by a Falcon Heavy rocket in a test flight on February 6, 2018. Tesla sold about 2,450 Roadsters in over 30 countries, and most of the last Roadsters were sold in Europe and Asia during the fourth quarter of 2012. Tesla produced right-hand-drive Roadsters from early 2010. The Roadster qualified for government incentives in several nations. According to the U.S. EPA, the Roadster can travel 393 kilometres (244 mi) on a single charge of its lithium-ion battery pack, and can accelerate from 0 to 97 km/h (0 to 60 mph) in 3.7 or 3.9 seconds depending on the model. It has a top speed of 201 km/h (125 mph). The Roadster's efficiency, (As of September 2008), was reported as 120 MPGe (2.0 L/100 km). It uses 135 Wh/km (21.7 kW·h/100 mi, 13.5 kW·h/100 km or 490 kJ/km) battery-to-wheel, and has an efficiency of 88% on average.
  • 3.1K
  • 11 Nov 2022
Topic Review
Methotrexate
Methotrexate (MTX), a structural analogue of folic acid, that inhibits cell division (mainly in the S phase of the cell cycle) is commonly used for the treatment of many cancers as well for severe and resistant forms of autoimmune pathologies and inflammatory disorders. This paragraph of clinical overview presents state of knowledge with regards to different pathways of MTX active transport system, mechanisms of action and its applications as immunosuppressive drug and anticancer agent.  
  • 3.1K
  • 28 Oct 2020
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