Aspect ratio invariant visual cryptography by image filtering and resizing

Yang, Ching-Nung; Chen, Pin-Wei; Shih, Hsiang-Wen; Kim, Cheonshik

doi:10.1007/s00779-012-0535-0

Cited by 16 publications

(4 citation statements)

References 24 publications

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“…Data encryption method is divided, based on input data type, into two blocks and streams. Most of the techniques presented are based on the image encryption [3][4].…”

Section: Classification Of Encryption Methodsmentioning

confidence: 99%

A New Method for Encrypting Digital Data Using Symmetric Key in Information Exchange Spaces

Lahrod¹,

Rahnemaei²,

Hatami³

2016

IJCATR

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with the arrival of the information age and much more important information systems and communication in human everyday life, necessity immunization information and communication strategy were also raised. The easiest way to meet this necessity is conventional encryption algorithms. Encryption is a right tool for data protection in an unsecure channel. To this end, from two-method symmetric key encryption and public-key cryptography are used. In this paper we examine text cryptography, one of the most important topics in cryptography. A unique attribute of this kind of encryption has been of interest to many researchers in this field. This paper, considering the symmetric encryption algorithm, provides a text encryption algorithm using a 128-bit key. The proposed algorithm uses a 128-bit key, the text data using the XOR operator to convert the encrypted information. Therefore, the aim of this method is to provide a convenient method for symmetrically encrypting data not to be easily decoded, and finally, the results of the tests show that the proposed method is better in terms of security and speed of execution.

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“…Data encryption method is divided, based on input data type, into two blocks and streams. Most of the techniques presented are based on the image encryption [3][4].…”

Section: Classification Of Encryption Methodsmentioning

confidence: 99%

A New Method for Encrypting Digital Data Using Symmetric Key in Information Exchange Spaces

Lahrod¹,

Rahnemaei²,

Hatami³

2016

IJCATR

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“…The type of shares of a VC scheme can either be meaningless [112] or meaningful [27]. A meaningless share resembles noise whereas a meaningful share is a discernible image used to embed information from the secret image.…”

Section: Visual Cryptography Metricsmentioning

confidence: 99%

An overview of visual cryptography techniques

Ibrahim

Teh

Abdullah

2021

Multimed Tools Appl

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Visual cryptography is an encryption technique that decomposes secret images into multiple shares. These shares are digitally or physically overlapped to recover the original image, negating the need for complex mathematical operations or additional hardware. There have been many variations of visual cryptography proposed over the years, each addressing different problems or to fulfill different security requirements. Existing review papers on the area only cover certain types of visual cryptography or lack comparisons between the various schemes. To address this gap, this paper provides broad overview of the area to aid new researchers in identifying research problems or to select suitable visual cryptography methods for their desired applications. For more veteran researchers in the area, our paper provides the most up-to-date coverage of the state-of-the-art. We first provide an introduction to the various categories of visual cryptography techniques, including a discussion on recently proposed schemes. These schemes are then compared in terms of their features, performance metrics, advantages and disadvantages. Compared to prior work, we extend the number of comparison metrics to include signal-to-noise ratio and the type of shares. Over 40 visual cryptography schemes that have been proposed in the past two decades were analyzed and compared. Our findings indicate that existing problems such as pixel expansion, poor quality of recovered image quality, computational and memory complexities still exist, and a optimizing the trade-off between these requirements still requires further investigation. We conclude the paper with a discussion of these open problems and future research directions.

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“…Zhou, Zhi, Gonzalo R. Arce [4] are Halftone visual cryptography and Yang, Ching-Nung, Pin-Wei Chen [5] are Aspect ratio invariant visual cryptography by image filtering and resizing. Applying the rich theory of blue noise half toning into the construction mechanism of conventional VC, used in a number of visual secret sharing applications which require high-quality visual images.…”

Section: Literature Reviewmentioning

confidence: 99%

Halftoning by Error Diffusion Method in Visual Cryptography for Greyscale Image

Mansoori¹,

Joshi²

2016

IJCA

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Visual Cryptography (VC) is a technique used for protecting image based secrets. The main concept of the original visual cryptography scheme is to encrypt a secret image into some shares. Secret information cannot be revealed with few shares. All shares are necessary to combine to reveal the secret image. Halftoning is the important feature of visual cryptography. It provides security at the early stage of visual cryptography. Halftoning is the reprographic techniques, whose process of converting large tone (high intensity value of pixel) image to low tone (low intensity value of pixel) image.The visual cryptography is a hide information technology. The visual cryptography uses sharing method apply for hide information. Here used the (2, 2) greyscale image method, 2 shares out of 2 stack the secret will reveal and less than 2 shares are not work. Here, proposed a modified algorithm of error-diffusion half toning in visual cryptography. Increment the quality of image by modified method according to different parameters. According to modified method, error distributed to nearest pixel. The compared author method with Floyed, Jarvis, and Stucki throw PSNR and UQI parameters.The visual secret scheme decrypts the secret image using Human Visual System (HVS) without any computation. Here, used to (2, 2) generate visual sharing system for halftone gray scale image. Here generate shares of halftone image and recovered secret image.

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Aspect ratio invariant visual cryptography by image filtering and resizing

Cited by 16 publications

References 24 publications

A New Method for Encrypting Digital Data Using Symmetric Key in Information Exchange Spaces

A New Method for Encrypting Digital Data Using Symmetric Key in Information Exchange Spaces

An overview of visual cryptography techniques

Halftoning by Error Diffusion Method in Visual Cryptography for Greyscale Image

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