• Title/Summary/Keyword: Encryption Algorithms

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QuadTree-Based Lossless Image Compression and Encryption for Real-Time Processing (실시간 처리를 위한 쿼드트리 기반 무손실 영상압축 및 암호화)

  • Yoon, Jeong-Oh;Sung, Woo-Seok;Hwang, Chan-Sik
    • The KIPS Transactions:PartC
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    • v.8C no.5
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    • pp.525-534
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    • 2001
  • Generally, compression and encryption procedures are performed independently in lossless image compression and encryption. When compression is followed by encryption, the compressed-stream should have the property of randomness because its entropy is decreased during the compression. However, when full data is compressed using image compression methods and then encrypted by encryption algorithms, real-time processing is unrealistic due to the time delay involved. In this paper, we propose to combine compression and encryption to reduce the overall processing time. It is method decomposing gray-scale image by means of quadtree compression algorithms and encrypting the structural part. Moreover, the lossless compression ratio can be increased using a transform that provides an decorrelated image and homogeneous region, and the encryption security can be improved using a reconstruction of the unencrypted quadtree data at each level. We confirmed the increased compression ratio, improved encryption security, and real-time processing by using computer simulations.

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An Implementation of Authentication and Encryption of Multimedia Conference using H.235 Protocol (H.235 프로토콜에 의한 영상회의의 인증과 암호화 구현)

  • Sim, Gyu-Bok;Lee, Keon-Bae;Seong, Dong-Su
    • The KIPS Transactions:PartC
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    • v.9C no.3
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    • pp.343-350
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    • 2002
  • This paper describes the implementation of H.235 protocol for authentication and media stream encryption of multimedia conference systems. H.235 protocol is recommended by ITU-T for H.323 multimedia conference security protocol to prevent from being eavesdropped and modified by an illegal attacker. The implementation in this paper has used password-based with symmetric encryption authentication. Media streams are encrypted using the Diffie-Hellman key exchange algorithm and symmetric encryption algorithms such as RC2, DES and Triple-DES. Also, 128-bit Advanced Encryption Standard and 128-bit Korean standard SEED algorithms are implemented for the future extension. The implemented authentication and media stream encryption has shown that it is possible to identify terminal users without exposing personal information on networks and to preserve security of multimedia conference. Also, encryption delay time and used memory are not increased even though supporting media stream encryption/decryption, thus the performance of multimedia conference system has not deteriorated.

The Hardware Design of Integrated Security Core for IoT Devices (사물인터넷 기기를 위한 통합 보안 코어의 하드웨어 설계)

  • Gookyi, Dennis A.N.;Ryoo, Kwangki
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2017.10a
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    • pp.584-586
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    • 2017
  • In this paper we provide a unified crypto core that integrates lightweight symmetric cryptography and authentication. The crypto core implements a unified 128 bit key architecture of PRESENT encryption algorithm and a new lightweight encryption algorithm. The crypto core also consist of an authentication unit which neglects the use of hashing algorithms. Four algorithms are used for authentication which come from the Hopper-Blum (HB) and Hopper-Blum-Munilla-Penado (HB-MP) family of lightweight authentication algorithms: HB, HB+, HB-MP and HB-MP+. A unified architecture of these algorithms is implemented in this paper. The unified cryptosystem is designed using Verilog HDL, simulated with Modelsim SE and synthesized with Xilinx Design Suite 14.3. The crypto core synthesized to 1130 slices at 189Mhz frequency on Spartan6 FPGA device.

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Privacy-Preserving H.264 Video Encryption Scheme

  • Choi, Su-Gil;Han, Jong-Wook;Cho, Hyun-Sook
    • ETRI Journal
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    • v.33 no.6
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    • pp.935-944
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    • 2011
  • As a growing number of individuals are exposed to surveillance cameras, the need to prevent captured videos from being used inappropriately has increased. Privacy-related information can be protected through video encryption during transmission or storage, and several algorithms have been proposed for such purposes. However, the simple way of evaluating the security by counting the number of brute-force trials is not proper for measuring the security of video encryption algorithms, considering that attackers can devise specially crafted attacks for specific purposes by exploiting the characteristics of the target video codec. In this paper, we introduce a new attack for recovering contour information from encrypted H.264 video. The attack can thus be used to extract face outlines for the purpose of personal identification. We analyze the security of previous video encryption schemes against the proposed attack and show that the security of these schemes is lower than expected in terms of privacy protection. To enhance security, an advanced block shuffling method is proposed, an analysis of which shows that it is more secure than the previous method and can be an improvement against the proposed attack.

A Survey on Cloud Storage System Security via Encryption Mechanisms

  • Alsuwat, Wejdan;Alsuwat, Hatim
    • International Journal of Computer Science & Network Security
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    • v.22 no.6
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    • pp.181-186
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    • 2022
  • Cloud computing is the latest approach that is developed for reducing the storage of space to store the data and helps the quick sharing of the data. An increase in the cloud computing users is observed that is also making the users be prone to hacker's attacks. To increase the efficiency of cloud storage encryption mechanisms are used. The encryption techniques that are discussed in this survey paper are searchable encryption, attribute-based, Identity-based encryption, homomorphic encryption, and cloud DES algorithms. There are several limitations and disadvantages of each of the given techniques and they are discussed in this survey paper. Techniques are found to be effective and they can increase the security of cloud storage systems.

Cryptographic Algorithms for the Military Secret Data Management (군사분야 비밀자료 관리를 위한 암호 알고리즘)

  • Kim, HongTae;Lee, MoonSik;Kang, Sunbu
    • Convergence Security Journal
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    • v.14 no.6_1
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    • pp.121-127
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    • 2014
  • There exists vast amount of information in the military, both at the personal level and at the national security level. Cryptographic algorithms can present a solution to managing this information safely. We suggest searchable encryption algorithms for efficiently managing military data, which should be treated securely in an online environment. Furthermore, we investigate algorithms that are effective for managing military data under various conditions.

Measurements of Encryption and Decryption Times of AES and LEA Algorithms on an Arduino MCU (아두이노를 이용한 AES와 LEA의 암복호화 속도 측정)

  • Kwon, Yeongjun;Shin, Hyungsik
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.971-977
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    • 2019
  • This paper presents an experimental result showing the encryption and decryption times of the AES and LEA algorithms. AES and LEA algorithms are international and Korean standards for block ciphers, respectively. Through experiments, this paper investigates the applicability of the LEA algorithm for light weight IoT devices. In order to measure the encryption and decryption times, 256-bit and 128-bit secret keys were randomly generated for AES and LEA, respectively. Under our test environment using an Arduino microcontroller, the AES algorithm takes about 45ms for encryption and decryption processes, whereas the LEA algorithm takes about 4ms. Even though processing times of each algorithm may vary much under different implementation and test environments, this experimental result shows that the LEA algorithm can be applied to many light weight IoT devices for security goals.

Analysis of NIST PQC Standardization Process and Round 4 Selected/Non-selected Algorithms (NIST PQC 표준화 과정 및 Round 4 선정/비선정 알고리즘 분석)

  • Choi Yu Ran;Choi Youn Sung;Lee Hak Jun
    • Convergence Security Journal
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    • v.24 no.2
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    • pp.71-78
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    • 2024
  • As the rapid development of quantum computing compromises current public key encryption methods, the National Institute of Standards and Technology (NIST) in the United States has initiated the Post-Quantum Cryptography(PQC) project to develop new encryption standards that can withstand quantum computer attacks. This project involves reviewing and evaluating various cryptographic algorithms proposed by researchers worldwide. The initially selected quantum-resistant cryptographic algorithms were developed based on lattices and hash functions. Currently, algorithms offering diverse technical approaches, such as BIKE, Classic McEliece, and HQC, are under review in the fourth round. CRYSTALS-KYBER, CRYSTALS-Dilithium, FALCON, and SPHINCS+ were selected for standardization in the third round. In 2024, a final decision will be made regarding the algorithms selected in the fourth round and those currently under evaluation. Strengthening the security of public key cryptosystems in preparation for the quantum computing era is a crucial step expected to have a significant impact on protecting future digital communication systems from threats. This paper analyzes the security and efficiency of quantum-resistant cryptographic algorithms, presenting trends in this field.

Design and Evaluation of A Block Encryption Algorithm using Dynamic-Key (동적 키를 이용한 블럭 암호 알고리즘의 설계 및 평가)

  • 정홍섭;이창두;박규석
    • Journal of Korea Multimedia Society
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    • v.5 no.6
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    • pp.683-696
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    • 2002
  • The existing block encryption algorithms have been designed for the encryption key value to be unchanged and applied to the round functions of each block, and enciphered. Therefore, it has such a weak point that the plaintext or encryption key could be easily exposed by differential cryptanalysis or linear cryptanalysis, both are the most powerful methods for decoding block encryption of a round-repeating structure. In order to overcome with this weak point, an encryption algorithm using a mote efficient key should be designed. In this paper, a block encryption algorithm which is designed for each encryption key value to be applied to each round block with different value is proposed. This algorithm needs a short processing time in an encryption and decryption, has a high intensity, can apply to electronic commerce and various applications of data protection.

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Design and Implementation of Image Encryption Method for Multi-Parameter Chaotic System (다중변수 혼돈계를 이용한 이미지 암호화 방법의 설계 및 구현)

  • Yim, Geo-Su
    • Convergence Security Journal
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    • v.8 no.3
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    • pp.57-64
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    • 2008
  • The Security of digital images has become increasingly more important in highly computerized and interconnected world. Therefore, The chaos-based encryption algorithms have suggested some new and efficient ways to develop secure image encryption method. This paper is described for the point at issue in all chaos-based encryption method for distribution of a chaotic signals. It has a method for generation of uniformly distributed chaotic signals that we designed secure algorithm of multi-parameter chaotic systems. So we are present validity of the theoretical models for results of image encryption and decryption for proposed method.

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