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A Study on the Digital Signature on Medical Images Based on the DICOM Standard

Author: WangLiangJun
Tutor: GuoWenMing
School: Southern Medical University,
Course: Biomedical Engineering
Keywords: Telemedicine DICOM Digital signature Hash ( hash ) RSA algorithm Message Authentication Code ( MAC )
CLC: R318.0
Type: Master's thesis
Year: 2010
Downloads: 81
Quote: 1
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Abstract

Picture archiving and communication system (Picture Archiving and Communicati on System, PACS), hospital departments, domestic cities as well as various medical institutions around the world are available through the network in real-time query and transmission of medical images, medical image information resources can be fully utilization. Clinicians comprehensive comparison study of the image from different devices of the same patient to be diagnosed, but also through the network consultation. At the same time, the use of the information provided by the PACS can shorten the time of diagnosis for each patient, the patient to provide timely and quality diagnosis, treatment and care. Contributed to the hospital to information technology, modern development, improve the diagnosis, reduce costs, strengthen management, to build clinical information resources. In this promotion, telemedicine (Telemedicine) as a systems engineering has great economic and social benefits, has become a widespread concern in the international, interdisciplinary high-tech. People establish a new link between medical experts and patients via telemedicine, in which patients in place, the original hospital to accept remote expert consultation and under the guidance of treatment and care. After a long period of development, telemedicine has been a lot of popularity and promotion. However, due to the Telemedicine is an emerging interdisciplinary, it relates to the medical, communications, computer technology, and China started late in the development process, there have been some problems to be solved. The promotion of telemedicine applications in addition subject to equipment, funding, personnel and other factors, there are legal obstacles, the authenticity of electronic diagnostic reports and medical records are not sure, medical malpractice and proceedings that may arise , can not be recognized as legal evidence. In order to ensure the authenticity of Medical Imaging image diagnostic reports and medical records, reliability, use of digital signature technology, agreed by the signer associated with various types of medical imaging images and electronic signature of a document, which means that the contents of the statement in the electronic documents and This responsibility. The digital signature system to authenticate the identity of the parties through a lot of technical solutions to ensure the transmission of the electronic document content has not been tampered with. DICOM (digital imaging and communication of medical, Medical Digital Imaging and Communications) is an important criterion in the PACS system at home and abroad the most advanced medical equipment, such as CT (CT), MR (magnetic resonance), support this standard. The DICOM standard allows the digital signature is added to all DICOM objects, such as images, waveforms and structured reports. Digital signatures provide a mechanism to ensure the authority and integrity of a DICOM object. Support DICOM objects (such as images) signed new medical equipment made possible, in urgent need of a solution to support the digital signature of the existing use of medical equipment. Appendix 41 of Chapter 15 of the DICOM standard describes how to perform the standard in an application. In order to prove the source of DICOM objects dispersed in a network environment, such as intranet, or extranet, manufacturers of medical imaging systems, such as the MRT or CT manufacturers have been committed in the device directly to the image signature. To generate a DICOM signature, we will use an embedded computer system, the system in the DICOM standard have the ability to perform specific encryption algorithms: hash algorithm, and RSA algorithm. In fact, in the present hospital system, many modern medical instrument itself already has a digital signature function. There are still many old medical equipment in the hospital, and they still work. For telemedicine and regional medical terms, these devices will not be able to prove his identity, it is difficult to ensure the integrity of the process of transmission and whether there has been tampering. Therefore, it is necessary to achieve these obsolete equipment digital signature. The specific implementation is added directly to a host computer, the host computer in these imaging equipment and workstations to complete the digital signature capabilities. So that in the back of the mainframe computer connected to two network ports, one connected to the imaging device, and the other connected doctor workstation or server. Then this is responsible for the digital signature from the medical imaging equipment generated image to the host above, by the host to digital signatures, signature, and then finished with an image from another port spread out. The result is to make the image out from medical imaging devices are digital signatures, and be able to prove their identity, proving the image transmission out which specific hospitals which sections of which device is to be sent, thus preventing medical disputes. This article study purposes. For these hosts, the internal digital signature using the digital signature based on a message digest, and its realization process, first of pins necessary files, such as the inside of the DICOM medical image file name of the patient, etc. pins Hash operation, here is taken RIPEMD-160 algorithm, which is based on the RIPEMD-160 algorithm from the collision, and is one of the fastest Hash Algorithm. Thereby generating a MAC (message authentication code). Then, using the private key of the RSA algorithm for the MAC encryption, after forming a digital signature. This digital signature embedded into the the DICOM corresponding tab. DICOM medical file is then transmitted to the the response doctor workstation or server. In the process of validating the digital signature is obtained by the same Hash operation to the corresponding pins, the Hash value. Then decrypt the digital signature using the corresponding public key of the RSA algorithm for transmission over the DICOM medical documents. Compare the similarities and differences of the two hash values ??to determine whether a file is transmitted by the other side over. In this paper, the authors do the following: 1 medical device digital signature in telemedicine and Regional Medical. And between each device and workstation embed a digital signature system. Each device digital signatures, their identity positioning. 2, in accordance with the requirements of the DICOM standard and its summary of the security of digital signature security summary, medical images over from the medical device transmits the digital signature.

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