Although office systems are moving toward paperless electronic structures, paper documents are still of high importance in everyday communications [1]. Paper documents are used as direct tools in identity identification, taxes, and financial transactions. Sources of these documents are generally laser or other types of printers. Public access to these printers and developing image editing software have facilitated editing and reproducing similar digital printed documents [2]. Forgery and tampering of paper documents may destroy general trust; therefore, it is very important to recognize forged printed documents and ensure their authenticity. Printer source identification is one of the forensic methods for ensuring the validity of scanned paper documents [3]. Authenticity of a printed document can be identified by a forensic expert and chemical tests; however, this process may destroy the printed document [4]. Therefore,
The encrypted satellite data can get corrupted before reaching the ground station due to various faults. One major source of faults is the harsh radiation environment. Single Even Upset (SEU) faults can occur on-board during encryption due to radiation. This paper presents a novel model to detect and correct Single Event Upsets in on-board implementations of the AES algorithm, which is based on Hamming error correcting code. From five modes of AES, CRT mode seems to be the best mode to encrypt satellite video and image links. A detailed analysis of the effect of SEUs on the imaging data during on-board encryption using the modes of AES is carried out. In this paper the impact of these faults on the data is discussed and compared for all the five modes of AES. A detailed analysis of the effect of SEUs on the imaging data during on-board encryption using the modes of AES is carried out.
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