• Title/Summary/Keyword: image security system

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An Attack Origin Detection Mechanism in IP Traceback Using Marking Algorithm (마킹 알고리듬 기반 IP 역추적에서의 공격 근원지 발견 기법)

  • 김병룡;김수덕;김유성;김기창
    • Journal of the Korea Institute of Information Security & Cryptology
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    • v.13 no.1
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    • pp.19-26
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    • 2003
  • Recently, the number of internet service companies is increasing and so is the number of malicious attackers. Damage such as distrust about credit and instability of the service by these attacks may influence us fatally as it makes companies image failing down. One of the frequent and fatal attacks is DoS(Denial-of-Service). Because the attacker performs IP spoofing for hiding his location in DoS attack it is hard to get an exact location of the attacker from source IP address only. and even if the system recovers from the attack successfully, if attack origin has not been identified, we have to consider the possibility that there may be another attack again in near future by the same attacker. This study suggests to find the attack origin through MAC address marking of the attack origin. It is based on an IP trace algorithm, called Marking Algorithm. It modifies the Martins Algorithm so that we can convey the MAC address of the intervening routers, and as a result it can trace the exact IP address of the original attacker. To improve the detection time, our algorithm also contains a technique to improve the packet arrival rate. By adjusting marking probability according to the distance from the packet origin we were able to decrease the number of needed packets to traceback the IP address.

A Robust Pattern Watermarking Method by Invisibility and Similarity Improvement (비가시성과 유사도 증가를 통한 강인한 패턴 워터마킹 방법)

  • 이경훈;김용훈;이태홍
    • Journal of KIISE:Software and Applications
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    • v.30 no.10
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    • pp.938-943
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    • 2003
  • In this paper, we Propose a method using the Tikhonov-Miller process to improve the robustness of watermarking under various attacks. A visually recognizable pattern watermark is embedded in the LH2, HL2 and HH2 subband of wavelet transformed domain using threshold and besides watermark is embeded by utilizing HVS(Human Visual System) feature. The pattern watermark was interlaced after random Permutation for a security and an extraction rate. To demonstrate the improvement of robustness and similarity of the proposed method, we applied some basic algorithm of image processing such as scaling, filtering, cropping, histogram equalizing and lossy compression(JPEG, gif). As a result of experiment, the proposed method was able to embed robust watermark invisibility and extract with an excellent normalized correlation of watermark under various attacks.

HoloMarking: Digital Watermarking Method using Fresnel Hologram (홀로마킹: Fresnel 홀로그램을 이용한 디지털 워터마킹 기법)

  • Choi, Hyun-Jun;Seo, Young-Ho;Yoo, Ji-Sang;Kim, Dong-Wook
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.6C
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    • pp.604-610
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    • 2009
  • This paper propose a digital watermarking method for digital contents which satisfies both the invisibility and the robustness to attacks to prohibit counterfeiting, modification, illegal usage and illegal re-production of video contents. This watermarking algorithm insert a watermark(digital hologram) by generated using Fresnel transform which improve the robustness. The inserting positions of the watermark choose by considering the frequency property of an image and a watermark. Also the amount of watermarking for watermark bit decide by considering the level of 2DDWT. This algorithm was implemented by C++ and experimented for invisibility and robustness with optical system. The experiment results showed that the method satisfied enough the invisibility of the inserted watermark and robustness against attacks. For the general attacks, the error rate of the extracted watermark was less than 15%, which is enough in robustness against the attacks.

Technique of Range Query in Encrypted Database (암호화 데이터베이스에서 영역 질의를 위한 기술)

  • Kim, Cheon-Shik;Kim, Hyoung-Joong;Hong, You-Sik
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.45 no.3
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    • pp.22-30
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    • 2008
  • Recently, protection of personal information is getting more important. Many countries have legislated about the protection of personal information. Now, the protection of relevant personal information is required not for a simple image of enterprises but law obligation. Most databases in enterprises used to store customers' names, addresses and credit card numbers with no exceptions. The personal information about a person is sensitive, and this asset is strategic. Therefore, most enterprises make an effort to preserve personal information safely. If someone, however, hacks password information of DBMS manager, no one can trust this system. Therefore, encryption is required based in order to protect data in the database. Because of database encryption, however, it is the problem of database performance in terms of computation time and the limited SQL query. Thus, we proposed an efficient query method to solve the problem of encrypted data in this paper.

Scrambling Technology using Scalable Encryption in SVC (SVC에서 스케일러블 암호화를 이용한 스크램블링 기술)

  • Kwon, Goo-Rak
    • Journal of Korea Multimedia Society
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    • v.13 no.4
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    • pp.575-581
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    • 2010
  • With widespread use of the Internet and improvements in streaming media and compression technology, digital music, video, and image can be distributed instantaneously across the Internet to end-users. However, most conventional Digital Right Management are often not secure and not fast enough to process the vast amount of data generated by the multimedia applications to meet the real-time constraints. The SVC offers temporal, spatial, and SNR scalability to varying network bandwidth and different application needs. Meanwhile, for many multimedia services, security is an important component to restrict unauthorized content access and distribution. This suggests the need for new cryptography system implementations that can operate at SVC. In this paper, we propose a new scrambling encryption for reserving the characteristic of scalability in MPEG4-SVC. In the base layer, the proposed algorithm is applied and performed the selective scambling. And it encrypts various MVS and intra-mode scrambling in the enhancement layer. In the decryption, it decrypts each encrypted layers by using another encrypted keys. Throughout the experimental results, the proposed algorithms have low complexity in encryption and the robustness of communication errors.

Zero-Watermarking based on Chaotic Side Match Vector Quantization (무질저한 SMVQ 기반의 제로-워터마킹)

  • Kim, Hyung-Do;Park, Chan-Kwon
    • The Journal of the Korea Contents Association
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    • v.9 no.7
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    • pp.37-44
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    • 2009
  • Digital watermarking is a technology for preventing illegal copying, for protecting intellectual property rights and copyrights, and for suggesting grounds of the ownership by inserting watermarks into digital contents. Generally speaking, watermarking techniques cannot escape from data distortion and quality degradation due to the watermark insertion. In order to overcome the shortcoming, zero-watermarking techniques which do not change the original data have been proposed recently. This paper proposes CSMVQ(Chaotic SMVQ), a zero-watermarking system for SMVQ(Side Match Vector Quantization) which shows better compression ratio and quality and less blocking effect than VQ(Vector Quantization). In SMVQ, compression progresses from left top to right bottom in order to use the information of the two neighbor blocks, so it is impossible to insert watermarks chaotically. In the process of encoding, CSMVQ dynamically considers the information of the (1 to 4) neighbor blocks already encoded. Therefore, watermark can be inserted into digital contents in chaotic way. Experimental results show that the image quality compressed by CSMVQ is better than that of SMVQ and the inserted watermark is robust against some common attacks.

Study on the Sensor Gateway for Receive the Real-Time Big Data in the IoT Environment (IoT 환경에서 실시간 빅 데이터 수신을 위한 센서 게이트웨이에 관한 연구)

  • Shin, Seung-Hyeok
    • Journal of Advanced Navigation Technology
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    • v.19 no.5
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    • pp.417-422
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    • 2015
  • A service size of the IoT environment is determined by the number of sensors. The number of sensors increase means increases the amount of data generated by the IoT environment. There are studies to reliably operate a network for research and operational dynamic buffer for data when network congestion control congestion in the network environment. There are also studies of the stream data that has been processed in the connectionless network environment. In this study, we propose a sensor gateway for processing big data of the IoT environment. For this, review the RESTful for designing a sensor middleware, and apply the double-buffer algorithm to process the stream data efficiently. Finally, it generates a big data traffic using the MJpeg stream that is based on the HTTP protocol over TCP to evaluate the proposed system, with open source media player VLC using the image received and compare the throughput performance.

Landscape Design of KangWon Provincial Police Agency (강원도 지방경찰청 조경설계)

  • 이시영;김신원
    • Journal of the Korean Institute of Landscape Architecture
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    • v.30 no.2
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    • pp.79-87
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    • 2002
  • This landscape design proposal was presented to a design competition for the KangWon Province Police Agency(KPA). The site, about 27,711 $m^2$, is located at 293-4 Udu-dong, Chunchun, KangWon-Do. Design objectives of the KPA were to build a symbolic place which fall community members with pride, to elevate an identity and status of the KPA by creating a landscape correspondent to the concept of the building design, to provide community residents with a space to enjoy cultural and social activities, and to make environment friendly space. The main concept was developed by one of characteristics of the traditional spatial structure of Korea known as an, 'Open and Closed spatial structure.'By re-interpreting the traditional spatial structure and applying it to the site, the design met the various desires of the KPA. The site is primarily segmented into 6 sub spaces; entrance space Podori plaza, symbolic court, police billeting area, sports area, and rear rest area. The entrance space, Podori plaza, and symbolic court on the south-west part of the site represent the publicity of the site as the concept of ″open space.″ On the contrary, considering the specialty of police affairs, the north-east part of the site, which contains the police billeting area and rest area, were designed to maintain security by using the concept of ″closed space.″ To express an identity of the KPA, 'Podori', a police mascot, the plaza was designed and is suppose to function as the hub of the community. In the front section of the plaza, a symmetrical planting pattern, centering the strong axis, was introduced to strengthen its symbolic meaning. Traditional window frames such as the pattern of 'Pisal-jige'and 'Umulsal-jige' were used for the paving system which is applied as the environment friendly design. Site facilities and furnitrue were placed at every important spot in order to connect various spaces organically. As these well-tied spaces properly shared their function, spatial sequence and management would be promoted. The entire space was designed to allow free access of handicapped people. This proposal is meant to create a new image of KangWon province and to enhance the way of inhabitants' think about their community.

Face Recognition Under Ubiquitous Environments (유비쿼터스 환경을 이용한 얼굴인식)

  • Go, Hyoun-Joo;Kim, Hyung-Bae;Yang, Dong-Hwa;Park, Jang-Hwan;Chun, Myung-Geun
    • Journal of the Korean Institute of Intelligent Systems
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    • v.14 no.4
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    • pp.431-437
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    • 2004
  • This paper propose a facial recognition method based on an ubiquitous computing that is one of next generation intelligence technology fields. The facial images are acquired by a mobile device so-called cellular phone camera. We consider a mobile security using facial feature extraction and recognition process. Facial recognition is performed by the PCA and fuzzy LDA algorithm. Applying the discrete wavelet based on multi-resolution analysis, we compress the image data for mobile system environment. Euclidean metric is applied to measure the similarity among acquired features and then obtain the recognition rate. Finally we use the mobile equipment to show the efficiency of method. From various experiments, we find that our proposed method shows better results, even though the resolution of mobile camera is lower than conventional camera.

Assessment of Inundation Rainfall Using Past Inundation Records and CCTV Images (CCTV영상과 과거침수기록을 활용한 침수 강우량 평가 - 강남역을 중심으로 -)

  • Kim, Min Seok;Lee, Mi Ran;Choi, Woo Jung;Lee, Jong Kook
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.30 no.6_1
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    • pp.567-574
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    • 2012
  • For the past few years, the video surveillance market has shown a rapid growth due to the increasing demand for Closed Circuit Television(CCTV) by the public sector and the private security industry. While the overall utilization of CCTV in the public and private sectors is expanding, its usage in the field of disaster management is less than sufficient. Therefore, the authors of this study, in an effort to revisit the role of CCTV in disaster situations, have carried out a case analysis in the vicinity of the Gangnam Station which has been designated as a natural disaster-prone area. First, the CCTV images around the target location are collected and the time and depth of inundation are measured through field surveys and image analyses. Next, a rainfall analysis was conducted using the Automatic Weather Station(AWS) data and the past inundation records. Lastly, the authors provide an estimate of rainfall for the areas around the station and suggest viable warning systems and countermeasures. The results from this study are expected to make positive contributions towards a significant reduction of the damages caused by the floods around the Gangnam Station.