Mg Suresh · IGI Global eBooks · 2012
As the foundation of all security enhanced systems, encryptions and decryptions are defined, and homomorphic (additive or multiplicative), probabilistic, commutative, and verifiable features are extracted as the desirable ones of encryption and decryption algorithms for developing secure anonymous systems. Also encryption and decryption algorithms are classified and onetime pad, permutation and substitution, RSA, and ElGamal are introduced as typical algorithms. Among them, onetime pad, RSA, and ElGamal are extensively used to develop secure anonymous systems in the remainder of this book.
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Md. Liakot Ali (11649063), Md. Shazzatur Rahman (11714712), Fakir Sharif Hossain (11547322) · Figshare · 2021
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Dejian Fang (9636243), Shuliang Sun (9636246) · Figshare · 2020
<p>(a) Boat (b) Cipher image, (c) Decoded image, (d) Tiffany, (e) Cipher image, (f) Decoded image, (g) Pepper (h) Cipher image, (i) Decoded image.</p>
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Biljana S. Pejić, Anoop BR · INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT · 2025
In the digital age of today, organizations look up to secure, scalable, and efficient encryption techniques ensuring the protection of multimedia data and confidential communication. This paper offers a comparative study on symmetric cryptographic algorithms—DES, AES, and Blowfish—evaluated for their performance in image encryption and decryption. The analysis considers key size, rounds, encryption/ decryption speed, and overall security, demonstrating how these algorithms safeguard image data from unauthorized access. Experimental surveys highlight the strengths of AES in robustness, Blowfish in speed and flexibility, and DES in legacy use, but with vulnerabilities. The system-level evaluation provides insights into how cryptographic algorithms can be applied in real-world applications such as military communication, medical imaging, and secure internet transmission. Overall, the study demonstrates the critical role of encryption algorithms in enhancing confidentiality, maintaining integrity, and enabling secure multimedia communication—making it appropriate for environments seeking modernized image security frameworks.Overall, the solution demonstrates the power of Blowfish as a secure and performance-optimized algorithm—making it appropriate for systems seeking modernized encryption capabilities
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Inbarasan Muniraj, John T. Sheridan · SPIE eBooks · 2019
The application of artificial light to carry information, that is, to transmit signals over longer distances, dates from the use of fire to send messages. In the 1880s, Bell demonstrated his system for transmitting speech using a modulated beam of light. This invention paved the way for more complex light communications over distances of several hundred meters. However, such techniques only became widespread with the invention and implementation of the optical laser. The availability of coherent (monochromatic) light sources has led to the development of modern light-based, dense data transmission. Since then, many methods for transmitting information optically have been proposed and investigated. For example, initially, laser beams were shone through free space (i.e., the atmosphere). This approach has some drawbacks, for instance, system unreliability due to natural atmospheric effects (rain, snow, fog, and turbulence). These difficulties indicate why the propagation of light waves within shielded environments, such as through gas-filled pipes and tubes containing sequential arrangements of optical lenses, have been investigated. Of such approaches, optical fibers provide the best method of channeling light over long distances. For instance, a 550,000-mile optic fiber cable is hidden under the ocean transmitting vast quantities of information at high speed across the globe. However, in the vacuum of outer space, wave guidance is necessary, and in 2013, as part of the first demonstration of free-space laser communication, NASA scientists beamed an image of the Mona Lisa to the Lunar Reconnaissance Orbiter, a satellite orbiting the moon, from Earth.
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drablia, houssem · Zenodo (CERN European Organization for Nuclear Research) · 2025
This project provides a theoretical solution for the RSA encryption algorithm. It explains the steps of key generation, encryption, and decryption. The research is written in both Arabic and English. The goal is to illustrate the mathematical principles behind RSA and serve as an educational reference for students and researchers to understand how encryption and decryption work, without including programming code
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Salmanov, V. · Zenodo (CERN European Organization for Nuclear Research) · 2022
Based on the analysis, an algorithm for improving the development of automated distance learning systems is considered. The algorithm, designed to be integrated into existing educational systems, has been designed to be supported during use outside of robust computing systems. When preparing software based on the proposed algorithm, new data encryption technologies can be used. This completely eliminates the need for hardware.
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DR. R Girija, Shashi Shekhar Jha, Aryan Parashar et al. · International Journal For Multidisciplinary Research · 2025
The rapid growth of digital healthcare systems has increased the need to protect sensitive medical images from unauthorized access and cyber threats. This study proposes a secure and efficient web-based medical image encryption and decryption system using the Advanced Encryption Standard (AES). AES, a symmetric key algorithm, provides strong resistance against brute-force attacks and offers faster processing compared to traditional methods such as DES and RSA. The system encrypts medical images before storage or transmission and ensures accurate recovery using AES decryption. Experimental results show that AES delivers high security, noise-like encrypted outputs, low encryption time, and nearly lossless image restoration. Due to its speed, reliability, and compatibility with healthcare platforms, AES is highly suitable for safeguarding patient data in modern medical information systems.
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Shivangi Wadehra, Shivam Goel, Nidhi Sengar · International Journal of Trend in Scientific Research and Development · 2018
Advanced Encryption Standard (AES) algorithm is one of the most common and widely used symmetric block cipher algorithm. This algorithm has its own particular structure to encrypt and decrypt sensitive data and is applied in hardware and software, all over the world.
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Wolfram Demonstrations Project · 2007
In a Hill cipher encryption the plaintext message is broken up into blocks of length according to the matrix chosen. Each block of plaintext letters is then converted into a vector of numbers and is dotted with the matrix. The results are then converted back to letters and the ciphertext message is produced. For decryption of the ciphertext message the inverse of the encryption matrix must be fo;;
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Panagiotis Mougkogiannis (17002143), Essam Ghadafi (21440006), Andrew Adamatzky (802846) · Figshare · 2025
The plaintext input <i>X</i> undergoes encryption via the method <i>E</i> with a secret key <i>K</i>, resulting in ciphertext . The system delivers the ciphertext and then decrypts it with method <i>D</i> using the same key <i>K</i>. This recovers the original plaintext . The secret key <i>K</i> is safely disclosed between the sender and recipient before communication occurs. This procedure ensures confidentiality. Only those who know <i>K</i> can decrypt the communication. The same key is used for both encryption and decryption. This shows the system’s symmetry.
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Shivangi Wadehra, Shivam Goel, Nidhi Sengar · Bulletin of Miscellaneous Information (Royal Gardens Kew)
Advanced Encryption Standard (AES) algorithm is one of the most common and widely used symmetric block cipher algorithm. This algorithm has its own particular structure to encrypt and decrypt sensitive data and is applied in hardware and software, all over the world. It is extremely difficult for hackers to get the real data when encrypting by AES algorithm. In AES algorithm, encryption and decryption involves a number of rounds that depends on the length of the key and the number of block columns. So, to improve the strength of the AES the number of rounds is increased. Till date there is not any evidence to crack this algorithm. AES has the ability to deal with three different key sizes such as AES 128, 192 and 256 bit and each of this ciphers has 128 bit block size. This paper will provide an overview of AES algorithm and explain several crucial features of this algorithm in detail. Shivangi Wadehra | Shivam Goel | Nidhi Sengar"AES Algorithm: Encryption and Decryption" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-3 , April 2018, URL: http://www.ijtsrd.com/papers/ijtsrd11221.pdf http://www.ijtsrd.com/computer-science/computer-security/11221/aes-algorithm-encryption-and-decryption/shivangi-wadehra
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Etiel, Amit, Parsons, James, Jenkins-Edwards, Shawn · Digital Scholarship - UNLV (University of Nevada Reno) · 2018
Mathematician Lester Hill developed the Hill Cipher, the first mathematical encryption method ever developed, in 1929. This method was created in order to strengthen the level of security of previous methods and made it possible to encrypt more than three symbols at a time.
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Nagelhout, Ryan · CERN Document Server (European Organization for Nuclear Research) · 2016
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drablia, houssem · Zenodo (CERN European Organization for Nuclear Research) · 2025
This project provides a theoretical solution for the RSA encryption algorithm. It explains the steps of key generation, encryption, and decryption. The research is written in both Arabic and English. The goal is to illustrate the mathematical principles behind RSA and serve as an educational reference for students and researchers to understand how encryption and decryption work, without including programming code
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Nikhilesh Nayak, Akshay Chandak, Nisarg Shah et al. · IOP Conference Series Materials Science and Engineering · 2017
In this paper, we are performing multiple cryptography methods on a set of data and comparing their outputs. Here AES algorithm and RSA algorithm are used. Using AES Algorithm an 8 bit input (plain text) gets encrypted using a cipher key and the result is displayed on tera term (serially). For simulation a 128 bit input is used and operated with a 128 bit cipher key to generate encrypted text. The reverse operations are then performed to get decrypted text. In RSA Algorithm file handling is used to input plain text. This text is then operated on to get the encrypted and decrypted data, which are then stored in a file. Finally the results of both the algorithms are compared.
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Priyanka Ladda, Shyama Yadav, Shashank Vyas · Journal of Nonlinear Analysis and Optimization · 2023
In the digital age, the security of data has become a paramount concern. This research paper explores the fundamental concepts and practical applications of encryption and decryption as essential tools for ensuring data security. It delves into the historical evolution of encryption methods and the mathematical foundations of cryptographic algorithms. The paper provides a comprehensive overview of popular encryption algorithms, key management techniques, and the role of encryption in protecting data at rest, in transit, and during processing. Decryption techniques and potential vulnerabilities are also discussed, along with cryptographic attacks and countermeasures. The legal and ethical implications of encryption, including issues related to privacy and government access, are examined in the context of recent legislative developments. Real-world case studies illustrate the impact of encryption on cybersecurity incidents. The paper concludes by looking ahead to future trends in encryption and decryption technologies, addressing emerging challenges and opportunities in data security.
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Wilhelm, Greg · Acervo Digital da Universidade Estadual Paulista (Universidade Estadual Paulista) · 2011
In a Hill cipher encryption, the plaintext message is broken up into blocks of length according to m x n the matrix chosen. Each block of plaintext letters is then converted into a vector of numbers and is dotted with the matrix. The results are then converted back to letters and the ciphertext message is produced. For decryption of the ciphertext message, the inverse of the encryption matrix must be found. Once found, the decryption matrix is then dotted with each n-block of ciphertext, producing the plaintext message
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Taronisokhi Zebua · 2014
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Barath VS · International Journal for Research in Applied Science and Engineering Technology · 2024
In today's digital world, when sensitive data is routinely targeted by thieves, strong encryption technologies are critical for preventing breaches and ransomware attacks. Our research solves this need by creating a Secure Folder Encryption System that employs AES-GCM (Advanced Encryption Standard - Galois/Counter Mode) and HMAC (Hash-based Message Authentication Code) to secure data confidentiality and integrity when stored on cloud servers. Drawing on research on ECG image file encryption using ECDH and AES-GCM, we choose AES-GCM for its high resistance to manipulation and unauthorized access, while ECDSA (Elliptic Curve Digital Signature Algorithm) improves data authenticity. This method encrypts files before uploading them to the cloud, data is secure even if intercepted. In addition to a user friendly interface, the system is tuned for performance, evaluating encryption and decryption times and file sizes. Given the concerning trend of stolen encrypted data being sold on the dark web, as reported in recent headlines, our project offers a secure and effective method for safeguarding critical information in cloud storage
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