• Title/Summary/Keyword: Block encryption

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An Area-Efficient Design of Merged TEA Block Cipher for Mobile Security (모바일 보안용 병합 TEA 블록 암호의 면적 효율적인 설계)

  • Sonh, Seungil;Kang, Min-Goo
    • Journal of Internet Computing and Services
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    • v.21 no.3
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    • pp.11-19
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    • 2020
  • In this paper, a merged TEA block cipher processor which unifies Tiny Encryption Algorithm(TEA), extended Tiny Encryption Algorithm(XTEA) and corrected block TEA(XXTEA) is designed. After TEA cipher algorithm was first designed, XTEA and XXTEA cipher algorithms were designed to correct security weakness. Three types of cipher algorithm uses a 128-bit master key. The designed cipher processor can encrypt or decrypt 64-bit message block for TEA/XTEA and variable-length message blocks up to 256-bit for XXTEA. The maximum throughput for 64-bit message blocks is 137Mbps and that of 256-bit message blocks is 369Mbps. The merged TEA block cipher designed in this paper has a 16% gain on the area side compared to a lightweight LEA cipher. The cryptographic IP of this paper is applicable in security module of the mobile areas such as smart card, internet banking, and e-commerce.

Design of Encryption/Decryption Core for Block Cipher Camellia (Camellia 블록 암호의 암·복호화기 코어 설계)

  • Sonh, Seungil
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.4
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    • pp.786-792
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    • 2016
  • Camellia was jointly developed by Nippon Telegraph and Telephone Corporation and Mitsubishi Electric Corporation in 2000. Camellia specifies the 128-bit message block size and 128-, 192-, and 256-bit key sizes. In this paper, a modified round operation block which unifies a register setting for key schedule and a conventional round operation block is proposed. 16 ROMs needed for key generation and round operation are implemented using only 4 dual-port ROMs. Due to the use of a message buffer, encryption/decryption can be executed without a waiting time immediately after KA and KB are calculated. The suggested block cipher Camellia algorithm is designed using Verilog-HDL, implemented on Virtex4 device and operates at 184.898MHz. The designed cryptographic core has a maximum throughput of 1.183Gbps in 128-bit key mode and that of 876.5Mbps in 192 and 256-bit key modes. The cryptographic core of this paper is applicable to security module of the areas such as smart card, internet banking, e-commerce and satellite broadcasting.

A Study of DES(Data Encryption Standard) Property, Diagnosis and How to Apply Enhanced Symmetric Key Encryption Algorithm (DES(Data Encryption Standard) 속성 진단과 강화된 대칭키 암호 알고리즘 적용방법)

  • Noh, Si Choon
    • Convergence Security Journal
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    • v.12 no.4
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    • pp.85-90
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    • 2012
  • DES is a 64-bit binary, and each block is divided into units of time are encrypted through an encryption algorithm. The same key as the symmetric algorithm for encryption and decryption algorithms are used. Conversely, when decryption keys, and some differences may apply. The key length of 64 bits are represented by two ten thousand an d two 56-bit is actually being used as the key remaining 8 bits are used as parity check bits. The 64-bit block and 56-bit encryption key that is based on a total of 16 times 16 modifier and spread through the chaos is completed. DES algorithm was chosen on the strength of the password is questionable because the most widely available commercially, but has been used. In addition to the basic DES algorithm adopted in the future in the field by a considerable period are expected to continue to take advantage of the DES algorithm effectively measures are expected to be in the field note.

Hardware Software Co-Simulation of the Multiple Image Encryption Technique Using the Xilinx System Generator

  • Panduranga, H.T.;Naveen, Kumar S.K.;Sharath, Kumar H.S.
    • Journal of Information Processing Systems
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    • v.9 no.3
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    • pp.499-510
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    • 2013
  • Hardware-Software co-simulation of a multiple image encryption technique shall be described in this paper. Our proposed multiple image encryption technique is based on the Latin Square Image Cipher (LSIC). First, a carrier image that is based on the Latin Square is generated by using 256-bits of length key. The XOR operation is applied between an input image and the Latin Square Image to generate an encrypted image. Then, the XOR operation is applied between the encrypted image and the second input image to encrypt the second image. This process is continues until the nth input image is encrypted. We achieved hardware co-simulation of the proposed multiple image encryption technique by using the Xilinx System Generator (XSG). This encryption technique is modeled using Simulink and XSG Block set and synthesized onto Virtex 2 pro FPGA device. We validated our proposed technique by using the hardware software co-simulation method.

Design and Analysis of the GOST Encryption Algorithm (GOST 암호화 알고리즘의 구현 및 분석)

  • 류승석;정연모
    • Journal of the Korea Society for Simulation
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    • v.9 no.2
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    • pp.15-25
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    • 2000
  • Since data security problems are very important in the information age, cryptographic algorithms for encryption and decryption have been studied for a long time. The GOST(Gosudarstvennyi Standard or Government Standard) algorithm as a data encryption algorithm with a 256-bit key is a 64-bit block algorithm developed in the former Soviet Union. In this paper, we describe how to design an encryption chip based on the GOST algorithm. In addition, the GOST algorithm is compared with the DES(Data Encryption Standard) algorithm, which has been used as a conventional data encryption algorithm, in modeling techniques and their performance. The GOST algorithm whose key size is relatively longer than that of the DES algorithm has been expanded to get better performance, modeled in VHDL, and simulated for implementation with an CPLD chip.

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Masking-Based Block Cipher LEA Resistant to Side Channel Attacks (부채널 공격에 대응하는 마스킹 기반의 블록 암호 LEA)

  • Park, Eunsoo;Oh, Soohyun;Ha, Jaecheol
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.27 no.5
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    • pp.1023-1032
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    • 2017
  • When a cryptographic device such as smart card performs an encryption for a plain text, an attacker can extract the secret key in it using side channel information. Especially, many researches found some weaknesses for side channel attack on the lightweight block cipher LEA designed to apply in IoT environments. In this paper, we survey several masking countermeasures to defeat the side channel attack and propose a novel masking conversion method. Even though the proposed Arithmetic-to-Boolean masking conversion method requires storage memory of 256 bytes, it can improve the LEA encryption speed up to 17 percentage compared to the case adopted the previous masking method.

A Secure Modem System (데이타 보호용 모뎀 시스템)

  • 백기진;이창순;문상재
    • Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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    • 1991.11a
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    • pp.194-203
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    • 1991
  • This paper presents the hardware development of a secure modem system for personal computers. This system consists of a data encryption system and an existing modem. The algorithm of LUCIFER-type with block size of 64-bit is used for data encryption and Diffie-Hellman method is also employed for generation of the encryption key. We implement the system in hardware using the DSP56001.

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Fast Implementation of a 128bit AES Block Cipher Algorithm OCB Mode Using a High Performance DSP

  • Kim, Hyo-Won;Kim, Su-Hyun;Kang, Sun;Chang, Tae-Joo
    • Journal of Ubiquitous Convergence Technology
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    • v.2 no.1
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    • pp.12-17
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    • 2008
  • In this paper, the 128bit AES block cipher algorithm OCB (Offset Code Book) mode for privacy and authenticity of high speed packet data was efficiently designed in C language level and was optimized to support the required capacity of contents server using high performance DSP. It is known that OCB mode is about two times faster than CBC-MAC mode. As an experimental result, the encryption / decryption speed of the implemented block cipher was 308Mbps, 311 Mbps respectively at 1GHz clock speed, which is 50% faster than a general design with 3.5% more memory usage.

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The Analysis of Cipher Padding Problem for Message Recovery Security Function of Honey Encryption (허니암호의 메시지 복구보안 기능을 위한 암호패딩 문제점 분석)

  • Ji, Changhwan;Yoon, Jiwon
    • Journal of KIISE
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    • v.44 no.6
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    • pp.637-642
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    • 2017
  • Honey Encryption (HE) is a technique to overcome the weakness of a brute-force attack of the existing password-based encryption (PBE). By outputting a plausible plaintext even if the wrong key is entered, it provides message recovery security which an attacker can tolerate even if the attacker tries a brute-force attack against a small entropy secret key. However, application of a cipher that requires encryption padding to the HE present a bigger problem than the conventional PBE method. In this paper, we apply a typical block cipher (AES-128) and a stream cipher (A5 / 1) to verify the problem of padding through the analysis of the sentence frequency and we propose a safe operation method of the HE.

An Efficient Packet Encryption Scheme Based on Security Requirement Level (보안 요구 수준에 근거한 효율적인 패킷 암호화 기법)

  • 노지명;양정민
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.14 no.5
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    • pp.153-164
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    • 2004
  • Under a large-scale client-server service environment, e.g., online games, encrypting data for acquiring information security often causes overload to the server and hence degradation of the service itself. Therefore, for reducing encryption payload, it is necessary to use adequately an efficient encryption scheme with respect to the security requirements of transmission data. In this paper, we propose a packet encryption scheme using multiple cryptosystems to realize such capability, which assigns a different cryptosystem according to the security requirements level. The proposed encryption scheme is applicable to internet services with heavy traffic ratios in which different kinds of data packets are incessantly transmitted between clients and servers. To show its effectiveness and superiority, the performance of the proposed encryption scheme is verified by experiments.