scholarly journals Modified Advanced Encryption Standard Algorithm for Information Security

Symmetry ◽  
2019 ◽  
Vol 11 (12) ◽  
pp. 1484 ◽  
Author(s):  
Oluwakemi Christiana Abikoye ◽  
Ahmad Dokoro Haruna ◽  
Abdullahi Abubakar ◽  
Noah Oluwatobi Akande ◽  
Emmanuel Oluwatobi Asani
Keyword(s):  
Execution Time ◽  
Advanced Encryption Standard ◽  
Avalanche Effect ◽  
Plain Text ◽  
Aes Algorithm ◽  
Cipher Text ◽  
Encryption And Decryption ◽  
To Come ◽  
Cryptographic Techniques ◽  
Modified Aes

The wide acceptability of Advanced Encryption Standard (AES) as the most efficient of all of the symmetric cryptographic techniques has further opened it up to more attacks. Efforts that were aimed at securing information while using AES is still being undermined by the activities of attackers This has further necessitated the need for researchers to come up with ways of enhancing the strength of AES. This article presents an enhanced AES algorithm that was achieved by modifying its SubBytes and ShiftRows transformations. The SubBytes transformation is modified to be round key dependent, while the ShiftRows transformation is randomized. The rationale behind the modification is to make the two transformations round key dependent, so that a single bit change in the key will produce a significant change in the cipher text. The conventional and modified AES algorithms are both implemented and evaluated in terms avalanche effect and execution time. The modified AES algorithm achieved an avalanche effect of 57.81% as compared to 50.78 recorded with the conventional AES. However, with 16, 32, 64, and 128 plain text bytes, the modified AES recorded an execution time of 0.18, 0.31, 0.46, and 0.59 ms, respectively. This is slightly higher than the results obtained with the conventional AES. Though a slightly higher execution time in milliseconds was recorded with the modified AES, the improved encryption and decryption strength via the avalanche effects measured is a desirable feat.

IMPLEMENTASI ALGORITMA ADVANCED ENCRYPTION STANDARD DAN TRIPLE DATA ENCRYPTION STANDARD UNTUK MENGAMANKAN CITRA DIGITAL

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Mahadi Winafil ◽  
Sinar Sinurat ◽  
Taronisokhi Zebua
Keyword(s):  
Digital Images ◽  
Data Encryption ◽  
Advanced Encryption Standard ◽  
The Internet ◽  
Client Server ◽  
Data Encryption Standard ◽  
Aes Algorithm ◽  
Encryption And Decryption ◽  
Cryptographic Techniques ◽  
E Mail

Digital images that are personal and confidential are very vulnerable to wiretapping by irresponsible parties. Especially if distributed via the internet network such as on Facebook, WhatsApp and e-mail chat based applications. Images that are sent sometimes are often confidential images and must be maintained. In order to maintain the security of digital images can be done by utilizing cryptographic techniques. Cryptographic techniques can secure digital images by changing pixel values from digital images so as to produce different pixel values from the original image to be secured. This research will use AES 128 bit and Triple DES methods for encryption and decryption of digital images on client-server based applications. The results of the encryption AES algorithm will be re-encrypted with the Triple DES Algorithm so as to produce pixel values that are far different from the original pixel values. Keywords: cryptography, image, AES, Triple DES

scholarly journals Lossless and Reversible Data Hiding using Public Key Cryptography

2020 ◽  
Vol 32 ◽  
pp. 02002
Author(s):  
Pooja Shetye ◽  
Srushti Varekar ◽  
Manali Zajam ◽  
Monika Pawar ◽  
Sujata Kadam
Keyword(s):  
Data Hiding ◽  
Internet Access ◽  
Public Key Cryptography ◽  
Secret Message ◽  
Major Drawback ◽  
Plain Text ◽  
Private Key ◽  
Aes Algorithm ◽  
Cipher Text ◽  
Encryption And Decryption

In today’s world, the internet is a platform, where large amount of data can be obtained and transferred. Different technologies and internet access are used to transfer the data which can be accessed by authorized and unauthorized users.The major drawback of these technologies are that any unauthorized person can access it.Hence encryption and decryption is perform on Message/Data .In encryption the plain text/image is converted into cipher text/image.The technique of data hiding is used to hide the data that has to be transferred from the source to the destination.The process involves insertion of secret message in the cover image which is encrypted with the help of AES algorithm. This algorithm generates public/private key. All this process can be performed in lossless and reversible manner.

scholarly journals Implementation of a bit permutation-based advanced encryption standard for securing text and image files

2020 ◽  
Vol 19 (3) ◽  
pp. 1596
Author(s):  
Heidilyn V Gamido
Keyword(s):  
Encryption Algorithm ◽  
Advanced Encryption Standard ◽  
Differential Attack ◽  
Avalanche Effect ◽  
Aes Algorithm ◽  
Computational Requirement ◽  
Change Intensity ◽  
Modified Algorithm ◽  
Modified Aes ◽  
The Ideal

<span>The paper proposes a modification of the Advanced Encryption Standard (AES) to address its high computational requirement steaming from the complex mathematical operations in the MixColumns Transformation which makes the encryption process slow. Bit Permutation was used instead of the MixColumns Transformation since the use of bit permutation in an encryption algorithm achieves efficiency by providing minimum encryption time and memory requirement. Results of the study showed that the modified AES algorithm exhibited faster encryption by 18.47% and faster decryption by 18.77% for text files. The modified AES algorithm also resulted to 16.53% higher avalanche effect compared with the standard AES thus improving the security performance. Application of the modified AES in encrypting images in Cipher Block Chaining mode showed that the modified algorithm also exhibited 16.88% faster encryption and 11.96% decryption compared with the standard AES. Likewise, modifying the algorithm achieved the ideal result in the histogram analysis, information entropy, the correlation coefficient of adjacent pixels to resist statistical attack.  The ideal value in number of pixels change rate and unified average change intensity were also achieved making the modified algorithm resistant to differential attack. These results show that modifying AES by using bit permutation to replace MixColumns Transformation was able to address the high computational requirement of the algorithm resulting in a faster and more secure encryption algorithm for text files and images</span><span>.</span>

Pengembangan Algoritma Advanced Encryption Standard pada Sistem Keamanan SMS Berbasis Android Menggunakan Algoritma Vigenere

2017 ◽  
Vol 8 (2) ◽  
Author(s):  
Sugiyanto Sugiyanto ◽  
Rinci Kembang Hapsari
Keyword(s):  
Short Message Service ◽  
Security System ◽  
Advanced Encryption Standard ◽  
Short Message ◽  
Message Content ◽  
Safety Level ◽  
Avalanche Effect ◽  
Aes Algorithm ◽  
Encryption And Decryption ◽  
Message Service

Short Message Service (SMS) is working on a wireless network that allows the theft of the message contents. There are risks that could threaten the security of the contents of the message on SMS services, including SMS snooping, and SMS interception. Therefore, it takes security system messages on SMS services to maintain the security and integrity of the message content to cover the security messages. Algorithms Advanced Encryption Standard (AES) using a structure SPN (Substitution Permutation Network) structure, which has the disadvantage of encryption and decryption, so the safety level is low. To cover the security hole of these weaknesses, the researchers conducted the improvement of Advanced Encryption Standard (AES) algorithm security system based on android SMS using Vigenere algorithm, so that the level of security and integrity of the content of the short message becomes higher and difficult to solve. The results showed an average increase in percentage value of the avalanche effect from 37.24% to 42.96%. Keywords—Advanced Encryption Standard, android, message security, encryption.

scholarly journals An Enhanced Cryptographic Algorithm Using Bi-Modal Biometrics

2019 ◽  
Vol 8 (11) ◽  
pp. 2575-2582
Keyword(s):  
Advanced Encryption Standard ◽  
Generation Process ◽  
Key Generation ◽  
Plain Text ◽  
Cipher Text ◽  
Cryptographic Algorithm ◽  
Encryption And Decryption ◽  
Cryptographic Algorithms ◽  
Biometric Feature ◽  
Novel Algorithm

A novel cryptographic algorithm, namely Significant Secure Biometric Key (SSBK) algorithm is proposed.The novel algorithm is compared with the existing cryptographic algorithms like Advanced Encryption Standard (AES), key exchange algorithm like Diffie-Helman and also with Symmetric Random Biometric Key (SRBK) algorithm, and finally we prove the proposed algorithm is superior than existing algorithm based on few parameters. A sample plain text is taken and converted to cipher text and the key from the biometric feature is used for encryption and decryption. In the key generation process, the bi-modal biometrics, namely Ear and Lip features are taken. The concatenated key values obtained from ear and lip can be of minimum 8 bits to the maximum of 1024 bits based on the type of algorithm used.

scholarly journals Modified AES for Text and Image Encryption

2018 ◽  
Vol 11 (3) ◽  
pp. 942
Author(s):  
Heidilyn V. Gamido ◽  
Ariel M. Sison ◽  
Ruji P. Medina
Keyword(s):  
Advanced Encryption Standard ◽  
Text And Image ◽  
Avalanche Effect ◽  
Aes Algorithm ◽  
Cpu Usage ◽  
Computational Requirement ◽  
Encryption Algorithms ◽  
Mathematical Computation ◽  
Mathematical Operations ◽  
Modified Aes

Advanced Encryption Standard (AES) is one of the most frequently used encryption algorithms. In the study, the Advanced Encryption Standard is modified to address its high computational requirement due to the complex mathematical operations in MixColumns Transformation making the encryption process slow. The modified AES used Bit Permutation to replace the MixColumns Transformation in AES since bit permutation is easy to implement and it does not have any complex mathematical computation. Results of the study show that the modified AES algorithm exhibited increased efficiency due to the faster encryption time and reduced CPU usage. The modified AES algorithm also yielded higher avalanche effect which improved the performance of the algorithm.

scholarly journals Generating Cipher Text using BLOWFISH Algorithm for Secured Data Communications

2019 ◽  
Vol 9 (2) ◽  
pp. 117-121
Keyword(s):  
High Speed ◽  
High Performance ◽  
Encryption Algorithm ◽  
Advanced Encryption Standard ◽  
Aes Algorithm ◽  
Cipher Text ◽  
Original Message ◽  
Public Domain Software ◽  
Secured Data ◽  
Vhdl Code

Cryptography plays a major role in the network security. In order to secure the data one must do encryption of the original message. In this paper, the design and analysis of high speed and high performance BLOWFISH algorithm is implemented in VHDL coding and compared with AES (Advanced Encryption Standard) algorithm. The BLOWFISH algorithm involves the process of giving the data and key as input to the encryption block. BLOWFISH encryption algorithm is designed and programmed in VHDL coding. Then it is implemented in Xilinx 10.1. This research is carried in the following steps: designing of encryption algorithm, writing VHDL code, simulating the code on “ModelSim altera 6.5e”, synthesizing and implementing the code using Xilinx’s ISE 10.1.This research aims in developing flexible and technology independent architectures in the areas of VPN software, file compression, public domain software such as smart cards, etc. Also presents the comparison of BLOWFISH and AES algorithms. Experimental results show that BLOWFISH algorithm runs faster than AES algorithm while both of them consume almost the same Power.

scholarly journals Hybrid Approach of Modified AES

Cryptography ◽  
2020 ◽  
pp. 129-141
Author(s):  
Filali Mohamed Amine ◽  
Gafour Abdelkader
Keyword(s):  
Time Complexity ◽  
Input Data ◽  
Hybrid Approach ◽  
Encryption Algorithm ◽  
Advanced Encryption Standard ◽  
Aes Algorithm ◽  
Symmetric Key ◽  
Encryption Algorithms ◽  
Aes Encryption Algorithm ◽  
Modified Aes

Advanced Encryption Standard is one of the most popular symmetric key encryption algorithms to many works, which have employed to implement modified AES. In this paper, the modification that has been proposed on AES algorithm that has been developed to decrease its time complexity on bulky data and increased security will be included using the image as input data. The modification proposed itself including alteration in the mix column and shift rows transformation of AES encryption algorithm, embedding confusion-diffusion. This work has been implemented on the most recent Xilinx Spartan FPGA.

Hybrid Approach of Modified AES

2017 ◽  
Vol 7 (4) ◽  
pp. 83-93
Author(s):  
Filali Mohamed Amine ◽  
Gafour Abdelkader
Keyword(s):  
Time Complexity ◽  
Input Data ◽  
Hybrid Approach ◽  
Encryption Algorithm ◽  
Advanced Encryption Standard ◽  
Aes Algorithm ◽  
Symmetric Key ◽  
Encryption Algorithms ◽  
Aes Encryption Algorithm ◽  
Modified Aes

Advanced Encryption Standard is one of the most popular symmetric key encryption algorithms to many works, which have employed to implement modified AES. In this paper, the modification that has been proposed on AES algorithm that has been developed to decrease its time complexity on bulky data and increased security will be included using the image as input data. The modification proposed itself including alteration in the mix column and shift rows transformation of AES encryption algorithm, embedding confusion-diffusion. This work has been implemented on the most recent Xilinx Spartan FPGA.

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