This document describes a project called 2DCrypt that proposes a scheme for scaling and cropping encrypted images in the cloud. 2DCrypt uses a modified Paillier cryptosystem that encrypts images at the tile level rather than pixel level to reduce storage overhead. It allows cloud servers to perform operations like scaling and cropping on encrypted images without accessing the encryption keys. Analysis shows 2DCrypt provides confidentiality while incurring acceptable overhead during encrypted image processing tasks.

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2DCRYPT IMAGE SCALING AND CROPPING IN ENCRYPTED DOMAINS – 2016
 Java Projects
 February 7, 2017
Project Title:
2DCrypt Image Scaling and Cropping in Encrypted Domains – 2016
Abstract:
The evolution of cloud computing and a drastic increase in image size are making
the outsourcing of image storage and processing an attractive business model.
Although this outsourcing has many advantages, ensuring data confidentiality in
the cloud is one of the main concerns. There are state­of­the­art encryption
schemes for ensuring confidentiality in the cloud. However, such schemes do not
allow cloud datacenters to perform operations over encrypted images. In this
paper, we address this concern by proposing 2DCrypt, a modified Paillier
cryptosystem­based image scaling and cropping scheme for multi­user settings that allows cloud datacenters to scale and crop an
image in the encrypted domain. To anticipate a high storage overhead resulted from the naive per­pixel encryption, we propose a
space­efficient tiling scheme that allows tile­level image scaling and cropping operations. Basically, instead of encrypting each pixel
individually, we are able to encrypt a tile of pixels. 2DCrypt is such that multiple users can view or process the images without sharing
any encryption keys­a requirement desirable for practical deployments in real organizations. Our analysis and results show that
2DCrypt is INDistinguishable under Chosen Plaintext Attack secure and incurs an acceptable overhead. When scaling a 512_512
image by a factor of two, 2DCrypt requires an image user to download approximately 5.3 times more data than the un­encrypted
scaling and need to work approximately 2.3 s more for obtaining the scaled image in a plaintext.
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