Progressive Image Secret Sharing in De-Identification and Access Control

• Main Authors: Daniel Wu, 吳雨澄
• Other Authors: 吳家麟
• Format: Others
• Language: en_US
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/hxv2kt

碩士 === 國立臺灣大學 === 資訊工程學研究所 === 106 === De-Identification is an important issue that are getting more attention recently. Secret Sharing is a type of cryptographic method used to securely distribute digital media such as images, and with k or more shares, the secret media can be fully reconstructed. We combined these two idea, and proposed a progressive secret sharing method that can be used on privacy-concerned situation, such as security camera, medical records, or data management. In this thesis, we proposed a progressive image secret sharing method, which is based on the modified Shamir’s secret sharing scheme, and the idea of Hung’s progressive image sharing scheme. In our approach, we can share the image based on the assigned sensitive area and chosen threshold, so that we can do the access control by the share number. The key of our sharing scheme depends on the image size, share number, and/or the distribution of the threshold. We don’t need the information of sensitive area, which enhanced our security. Experiment results shows the ability of our method in multi-level access control on both normal parts and sensitive parts with high visual quality.