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Medical image watermarking with tamper detection and recovery

Zain JM, Fauzi AM

Conf Proc IEEE Eng Med Biol Soc, 2007 10 20;2006:3270-3.
PMID: 17945763

This paper discussed security of medical images and reviewed some work done regarding them. A fragile watermarking scheme was then proposed that could detect tamper and subsequently recover the image. Our scheme required a secret key and a public chaotic mixing algorithm to embed and recover a tampered image. The scheme was also resilient to VQ attack. The purposes were to verify the integrity and authenticity of medical images. We used 800 x 600 x 8 bits ultrasound (US) greyscale images in our experiment. We tested our algorithm for up to 50% tampered block and obtained 100% recovery for spread-tampered block.

Matched MeSH terms: Computer Security
Fulltext Invariant domain watermarking using heaviside function of order alpha and fractional Gaussian field

Abbasi A, Woo CS, Ibrahim RW, Islam S

PLoS One, 2015;10(4):e0123427.
PMID: 25884854 DOI: 10.1371/journal.pone.0123427

Digital image watermarking is an important technique for the authentication of multimedia content and copyright protection. Conventional digital image watermarking techniques are often vulnerable to geometric distortions such as Rotation, Scaling, and Translation (RST). These distortions desynchronize the watermark information embedded in an image and thus disable watermark detection. To solve this problem, we propose an RST invariant domain watermarking technique based on fractional calculus. We have constructed a domain using Heaviside function of order alpha (HFOA). The HFOA models the signal as a polynomial for watermark embedding. The watermark is embedded in all the coefficients of the image. We have also constructed a fractional variance formula using fractional Gaussian field. A cross correlation method based on the fractional Gaussian field is used for watermark detection. Furthermore the proposed method enables blind watermark detection where the original image is not required during the watermark detection thereby making it more practical than non-blind watermarking techniques. Experimental results confirmed that the proposed technique has a high level of robustness.

Matched MeSH terms: Computer Security
Fulltext Understanding employees' perception towards personal data protection through their work processes in privacy enhancing technologies (pets) adoption

May, Fen Gan, Hui, Na Chua, Siew, Fan Wong, Irene, Ai Lian Tan

Malaysian Journal of Qualitative Research, 2019;5(2):6-21.
MyJurnal

With the increase of consumers’ privacy concerns and the government-enforced regulations on data protection, it is necessary for organizations to implement Privacy Enhancing Technologies (PETs) to protect consumers’ personal data. PETs refer to any protection in the form of technology. Since employees are the main stakeholders who are directly involved in the PETs implementation and execution process, it is important to understand employees’ perceptions especially those daily tasks involving the process of collecting and processing consumers’ data. Prior literature showed limited research on the effects of PETs implementation through employees’ work process and their perception on the implementation in protection personal data. Hence, the purpose of this research is to explore how PETs adoption affects employees’ work process and their perception. A qualitative single case study was adopted in a telecommunications company in Malaysia. Data were collected through in-depth interviews from nine respondents who were involved in data collecting, data processing and data controlling in their daily tasks. The results showed that employees experience difference levels of change depending on their work nature. The affected areas of change in implementing PETs are workload, communication level and data access. Employees also raised their concerns on vendors’ accountability. This research provides an insight into employees’ perception towards personal data protection based on their experience in implementing PETs. Continuous awareness, updates, monitoring and evaluating of system are perceived as the key to successful PETs implementation in protecting personal data.

Matched MeSH terms: Computer Security
A structural equation modeling approach for the adoption of cloud computing to enhance the Malaysian healthcare sector

Ratnam KA, Dominic PD, Ramayah T

J Med Syst, 2014 Aug;38(8):82.
PMID: 24957398 DOI: 10.1007/s10916-014-0082-5

The investments and costs of infrastructure, communication, medical-related equipments, and software within the global healthcare ecosystem portray a rather significant increase. The emergence of this proliferation is then expected to grow. As a result, information and cross-system communication became challenging due to the detached independent systems and subsystems which are not connected. The overall model fit expending over a sample size of 320 were tested with structural equation modelling (SEM) using AMOS 20.0 as the modelling tool. SPSS 20.0 is used to analyse the descriptive statistics and dimension reliability. Results of the study show that system utilisation and system impact dimension influences the overall level of services of the healthcare providers. In addition to that, the findings also suggest that systems integration and security plays a pivotal role for IT resources in healthcare organisations. Through this study, a basis for investigation on the need to improvise the Malaysian healthcare ecosystem and the introduction of a cloud computing platform to host the national healthcare information exchange has been successfully established.

Matched MeSH terms: Computer Security
Fulltext Tamper localization and lossless recovery watermarking scheme with ROI segmentation and multilevel authentication

Liew SC, Liew SW, Zain JM

J Digit Imaging, 2013 Apr;26(2):316-25.
PMID: 22555905 DOI: 10.1007/s10278-012-9484-4

Tamper localization and recovery watermarking scheme can be used to detect manipulation and recover tampered images. In this paper, a tamper localization and lossless recovery scheme that used region of interest (ROI) segmentation and multilevel authentication was proposed. The watermarked images had a high average peak signal-to-noise ratio of 48.7 dB and the results showed that tampering was successfully localized and tampered area was exactly recovered. The usage of ROI segmentation and multilevel authentication had significantly reduced the time taken by approximately 50 % for the tamper localization and recovery processing.

Matched MeSH terms: Computer Security
Systematic Review of Real-time Remote Health Monitoring System in Triage and Priority-Based Sensor Technology: Taxonomy, Open Challenges, Motivation and Recommendations

Albahri OS, Albahri AS, Mohammed KI, Zaidan AA, Zaidan BB, Hashim M, et al.

J Med Syst, 2018 Mar 22;42(5):80.
PMID: 29564649 DOI: 10.1007/s10916-018-0943-4

The new and ground-breaking real-time remote monitoring in triage and priority-based sensor technology used in telemedicine have significantly bounded and dispersed communication components. To examine these technologies and provide researchers with a clear vision of this area, we must first be aware of the utilised approaches and existing limitations in this line of research. To this end, an extensive search was conducted to find articles dealing with (a) telemedicine, (b) triage, (c) priority and (d) sensor; (e) comprehensively review related applications and establish the coherent taxonomy of these articles. ScienceDirect, IEEE Xplore and Web of Science databases were checked for articles on triage and priority-based sensor technology in telemedicine. The retrieved articles were filtered according to the type of telemedicine technology explored. A total of 150 articles were selected and classified into two categories. The first category includes reviews and surveys of triage and priority-based sensor technology in telemedicine. The second category includes articles on the three-tiered architecture of telemedicine. Tier 1 represents the users. Sensors acquire the vital signs of the users and send them to Tier 2, which is the personal gateway that uses local area network protocols or wireless body area network. Medical data are sent from Tier 2 to Tier 3, which is the healthcare provider in medical institutes. Then, the motivation for using triage and priority-based sensor technology in telemedicine, the issues related to the obstruction of its application and the development and utilisation of telemedicine are examined on the basis of the findings presented in the literature.

Matched MeSH terms: Computer Security
Fulltext Using telemedicine to support care for people with type 2 diabetes mellitus: a qualitative analysis of patients' perspectives

Lee JY, Chan CKY, Chua SS, Paraidathathu T, Lee KK, Tan CSS, et al.

BMJ Open, 2019 Oct 22;9(10):e026575.
PMID: 31640990 DOI: 10.1136/bmjopen-2018-026575

OBJECTIVE: Telemedicine has been promoted as an economical and effective way to enhance patient care, but its acceptance among patients in low-income and middle-income countries is poorly understood. This study is aimed to explore the experiences and perspectives of people with type 2 diabetes mellitus that used telemedicine to manage their condition.
DESIGN: In-depth and focus group interviews were conducted with participants who have engaged in telemedicine. Questions included were participants' perception on the programme being used, satisfaction as well as engagement with the telemedicine programme. All interviews and focus groups were audio-recorded and transcribed verbatim. Data were analysed using a thematic approach.
PARTICIPANTS AND SETTING: People with type 2 diabetes (n=48) who participated in a randomised controlled study which examined the use of telemedicine for diabetes management were recruited from 11 primary care clinics located within the Klang Valley.
RESULTS: Twelve focus groups and two in-depth interviews were conducted. Four themes emerged from the analysis: (1) generational difference; (2) independence and convenience, (3) sharing of health data and privacy and (4) concerns and challenges. The main obstacles found in patients using the telemedicine systems were related to internet connectivity and difficulties experienced with system interface. Cost was also another significant concern raised by participants. Participants in this study were primarily positive about the benefits of telemedicine, including its ability to provide real-time data and disease monitoring and the reduction in clinic visits.
CONCLUSION: Despite the potential benefits of telemedicine in the long-term care of diabetes, there are several perceived barriers that may limit the effectiveness of this technology. As such, collaboration between educators, healthcare providers, telecommunication service providers and patients are required to stimulate the adoption and the use of telemedicine.NCT0246680.

Matched MeSH terms: Computer Security
Clinical evaluation of watermarked medical images

Zain JM, Fauzi AM, Aziz AA

Conf Proc IEEE Eng Med Biol Soc, 2007 10 20;2006:5459-62.
PMID: 17946306

Digital watermarking medical images provides security to the images. The purpose of this study was to see whether digitally watermarked images changed clinical diagnoses when assessed by radiologists. We embedded 256 bits watermark to various medical images in the region of non-interest (RONI) and 480K bits in both region of interest (ROI) and RONI. Our results showed that watermarking medical images did not alter clinical diagnoses. In addition, there was no difference in image quality when visually assessed by the medical radiologists. We therefore concluded that digital watermarking medical images were safe in terms of preserving image quality for clinical purposes.

Matched MeSH terms: Computer Security