A bit toggling approach for AMBTC tamper detection scheme with high image fidelity

• DOI: 10.1371/journal.pone.0230997
• Publication Date: 2020-04-16T18:33:53Z
• Authors: Wien Hong; Dan Li; Der-Chyuan Lou; Xiaoyu Zhou; Chien-Hung Chang
• Keywords: Bitmap; Block Truncation Coding; High fidelity; Distortion (music)

The existing tamper detection schemes for absolute moment block truncation coding (AMBTC) compressed images are able to detect the tampering. However, marked image qualities of these can be enhanced, and their authentication methods may fail some special We propose a secure AMBTC scheme that preserves high fidelity with excellent detectability. In proposed approach, bit in bitmaps codes is sequentially toggled generate set codes. one causes least distortion embedded into quantization levels guidance key-generated reference table (RT). Without correct key, same cannot constructed. Therefore, method various kinds malicious tampering, including those tampering techniques designed RT-based schemes. not only offers better quality, but also provides an satisfactory detectability as compared previous works.