Modified AES for Text and Image Encryption

Gamido, Heidilyn V.; Sison, Ariel M.; Medina, Ruji P.

doi:10.11591/ijeecs.v11.i3.pp942-948

Cited by 25 publications

(24 citation statements)

References 10 publications

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“…The correlation coefficient in horizontal direction of the plain and encrypted image are the same which means that the two images are the same in horizontal direction [14]. Figure 1 shows the modified AES algorithm using bit permutation as presented in the study of [13]. The result in the paper shows that the use of bit permutation instead of MixColumns makes the modified AES algorithm suited for encrypting digital images because of increased efficiency and throughput due to reduced execution time and CPU usage.…”

Section: Review Of Related Literaturementioning

confidence: 99%

“…The result in the paper shows that the use of bit permutation instead of MixColumns makes the modified AES algorithm suited for encrypting digital images because of increased efficiency and throughput due to reduced execution time and CPU usage. Bit permutation has no complex mathematical operationbut only involves shifting of the position of bits of every state [13]. The proposed modified AES algorithm takes 128bit data length as input and 128 key length which has ten rounds of transformation and used AES-CBC mode in encrypting images.…”

Section: Review Of Related Literaturementioning

confidence: 99%

“…Therefore, having an efficient cryptographic algorithm is considered to be imperative, and a fast encryption algorithm is to be chosen to provide higher security in digital images [12]. The paper presents an implementation of the modified AES algorithm [13] as an image encryption scheme. The modified algorithm used bit permutation in replacement of the MixColumns Transformation to achieve faster encryption time in images.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of Modified AES as Image Encryption Scheme

Gamido

Sison

Medina

2018

IJEEI

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Since images have bigger size than text, a faster encryption algorithm is needed to provide higher security in digital images. The paper presents a modified AES algorithm that address the requirement in image encryption. The modified algorithm used bit permutation in replacement of MixColumns to reduce the computational requirement of the algorithm in encrypting images. Results of the study show that the modified algorithm exhibited faster encryption and decryption time in images. The modified algorithm also achieved a good result in the key sensitivity analysis, histogram analysis, information entropy, the correlation coefficient of adjacent pixels, Number of Pixel Change Rate and Unified Average Change Intensity making the modified algorithm resistant to statistical and differential attack.

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Section: Review Of Related Literaturementioning

confidence: 99%

Section: Review Of Related Literaturementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Implementation of Modified AES as Image Encryption Scheme

Gamido

Sison

Medina

2018

IJEEI

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“…Cryptography lies at the heart of a multitude of processes that incorporate E-Commerce, Internet Banking, Business and Social Networks, Smart Systems and so forth in our information-aware society [1], [2]. The evolution of the digital world has affected the way in which people manage finances, procure goods and access healthcare.…”

Section: Introductionmentioning

confidence: 99%

Modified honey encryption scheme for encoding natural language message

Omolara¹,

Jantan²

2019

IJECE

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Conventional encryption schemes are susceptible to brute-force attacks. This is because bytes encode utf8 (or ASCII) characters. Consequently, an adversary that intercepts a ciphertext and tries to decrypt the message by brute-forcing with an incorrect key can filter out some of the combinations of the decrypted message by observing that some of the sequences are a combination of characters which are distributed non-uniformly and form no plausible meaning. Honey encryption (HE) scheme was proposed to curtail this vulnerability of conventional encryption by producing ciphertexts yielding valid-looking, uniformly distributed but fake plaintexts upon decryption with incorrect keys. However, the scheme works for only passwords and PINS. Its adaptation to support encoding natural language messages (e-mails, human-generated documents) has remained an open problem. Existing proposals to extend the scheme to support encoding natural language messages reveals fragments of the plaintext in the ciphertext, hence, its susceptibility to chosen ciphertext attacks (CCA). In this paper, we modify the HE schemes to support the encoding of natural language messages using Natural Language Processing techniques. Our main contribution was creating a structure that allowed a message to be encoded entirely in binary. As a result of this strategy, most binary string produces syntactically correct messages which will be generated to deceive an attacker who attempts to decrypt a ciphertext using incorrect keys. We evaluate the security of our proposed scheme.

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“…However, with the development of new computing concepts that may weaken the strength of current and standardized cryptography, the need to strengthen and provide modifications and diversities in cryptography are being widely accepted [13]. Some studies have proposed modifications to AES: the replacement of mixcolumn transformation to bit permutation to speed up the encryption of texts and images was proposed in [14]. Whereas in [15], three modifications were proposed for encrypting high definition images, first a reduction in the use of mixcolumn from 10 to 5 rounds, second was the addition of mixcolumn in the key schedule algorithm, and third was the use of single S-box for both encryption and decryption.…”

Section: Introductionmentioning

confidence: 99%

File encryption based on reduced-round AES with revised round keys and key schedule

Reyes

Sison

Medina

2019

IJEECS

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The continuing advancement of technology had provided security issues in protecting the confidentiality of information. The need to protect unauthorized access of a third party is warranted. In this paper, the reduced-round modified AES with revised round keys and key schedule is proposed to ensure file confidentiality. The modifications to the AES cipher round was the reduction of the round iterations from 10 to 6, and additional key permutations were added in between states; while in the key schedule, additional byte substitution process was appended. Time and throughput were utilized to measure the performance of the application's encryption/decryption process; while the avalanche effect and randomness tests were used to measure the security of the modified AES algorithm. The results of evaluations have shown that the encryption and decryption time have improved by 1.27% and 1.21% respectively while the throughput has similarly improved by 1.29% and 3.19% for both encryption and decryption respectively. Whereas the avalanche effect of the modified AES was 50.06% which was more than the ideal value of 50% and it was also better than the standard AES which was 49.94% using the sample dataset. Finally, all the ciphertext outputs of the modified AES passed the randomness tests.

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Modified AES for Text and Image Encryption

Cited by 25 publications

References 10 publications

Implementation of Modified AES as Image Encryption Scheme

Implementation of Modified AES as Image Encryption Scheme

Modified honey encryption scheme for encoding natural language message

File encryption based on reduced-round AES with revised round keys and key schedule

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