• Journal of the Korea Institute of Information Security & Cryptology
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• v.32 no.4
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• pp.723-736
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• 2022

Steganography is being used as a means of secret communication for crimes that threaten national security such as terrorism and espionage. With the development of computers, steganography technologies develop and criminals produce and use their own programs. However, the research for steganography is not active because detailed information on national security cases is not disclosed. The development of investigation technologies and the responses of criminal law are insufficient. Therefore, in this paper, the detection and decoding process was examined for steganography investigation, and the method was analyzed for 'the spy case of Pastor Kim', who was convicted by the Supreme Court. Multiple security devices were prepared using symmetric steganography using the pre-promised stego key. Furthermore, the three criminal legal issues: (1) the relevance issue, (2) the right to participate, and (3) the public trial issue a countermeasure were considered in national security cases. Through this paper, we hope that the investigative agency will develop analysis techniques for steganography.

• Journal of Science and Technology Studies
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• v.5 no.2 s.10
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• pp.23-47
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• 2005

This study explores the way of prescribing the ethic of science in korean society in the 2004 ethical debates about 'Hwang woo-suk' embryo stem-cell study. It is the process of ethical communication. The debate includes very sensitive problem such as ovum and embryo, which is related directly with life. Particularly, this issue has many implications as there was a wild enthusiasm of patriotism in Korean society after had published Prof. Hwang's paper. This case shows dramatically the formation of ethical attitude in our society. There were included many actor's desire, interest, and conflicts. This study analyzes the process of competition to seize the initiative of the definition of ethics. It includes patriotic discourse, competition of rhetorics. This ethical communication involves the making of 'star scientist', Hwang woo-suk. In consequence, the ethics has been marginalized and stigmatized as anti-science on the stage of star scientist. This study argues ethics is not a fixed thing, it is construction of competition.

• Analytical Science and Technology
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• v.34 no.3
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• pp.115-121
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• 2021

Ethyl glucuronide (EtG) and ethyl sulfate (EtS), which are ethanol metabolites, are direct indicators of ethanol intake; they have been studied in a variety of biological samples in forensic science. It is necessary to analyze ethanol metabolites to determine whether the ethanol detected in autopsy cases was due to alcohol consumption before death or due to the ethanol produced from post-mortem decay. In general, EtG and EtS are detected in the blood together with ethanol; however, it may be difficult to secure blood depending on the extent of decay. Therefore, the aforementioned method should be replaced by detecting the ethanol metabolites using tissue biological samples. In this study, we determined the optimal experimental conditions for detecting EtG and EtS from spleen samples using Liquid Chromatography - Tandem Mass Spectrometry (LC-MS/MS). Herein, the test method was validated, and an analysis method was applied to the actual autopsy cases.

• Analytical Science and Technology
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• v.20 no.3
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• pp.204-212
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• 2007

The study was carried out to investigate the ratio of ethanol to n-propanol in blood and urine specimens, and developed a method for distinguishing ingested ethanol from artifactual ethanol in urine samples. In case of no urinary ethanol was detected, the ratio of ethanol to n-propanol concentration was about 12~20 times higher than those of blood. Therefore, it might be a good method to determine whether the detected ethanol is from drinking or from microbial fermentation. During the metabolism of ethanol, the levels of the metabolite of serotonin (5-hydroxytryptamine, 5-HT) and 5-hydroxyindole-3-acetic acid (5-HIAA) were decreased, while 5-hydroxytryptophol (5-HTOL) was increased. The levels of 5-HTOL/5-HIAA in urine samples of drinking suspects were greater than 1, in that of no drinking suspects were less than 1.

• Convergence Security Journal
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• v.23 no.5
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• pp.45-55
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• 2023

With the widespread use of digital devices, anonymous communication technologies such as the dark web and deep web are becoming increasingly popular for criminal activity. Because these technologies leave little local data on the device, they are difficult to track using conventional crime investigation techniques. The United States and the United Kingdom have enacted laws and developed systems to address this issue, but South Korea has not yet taken any significant steps. This paper proposes a new blockchain-based crime investigation method that uses physical memory data analysis to track the behavior of anonymous network users. The proposed method minimizes infringement of basic rights by only collecting physical memory data from the device of the suspected user and storing the tracking information on a blockchain, which is tamper-proof and transparent. The paper evaluates the effectiveness of the proposed method using a simulation environment and finds that it can track the behavior of dark website users with a residual rate of 77.2%.

• The Journal of the Korea Contents Association
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• v.9 no.10
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• pp.274-283
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• 2009

To effectively and quickly respond to new forms of terrorism, a more organically integrated and coordinated system will be needed. As establishing the grounds of such a system based on laws would be most in congruence with legalism, it would be desirable to fundamentally establish an antiterrorism act. However, enactment of such counter-terrorism laws must be accomplished by means with which human rights violations against citizens may be minimized, contrary to what has been the case with third world nations. The act will need to include clauses that may relieve organizations, such as national human rights committees or citizen groups, of concerns over potential human rights violations. To address vulnerabilities of investigative rights issues which relate to cases relevant to acts of terrorism being delegated to the National Intelligence Service, the investigative jurisdiction shall be assigned to the public prosecutors and law enforcement officials as with other criminal proceedings. As for public concern that establishing the Anti-Terrorism Center under the National Intelligence Service, a secret service agency, may infringe upon human rights, functional and organizational dualism of the Anti -terrorism Center would be worth taking into account.

• Journal of Digital Convergence
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• v.19 no.3
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• pp.187-194
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• 2021

OSINT(Open Source Intelligence), rapidly increasing on the surface web in various forms, can also be used for criminal investigations by using profiling. This technique has become quite common in foreign investigative agencies such as the United States. On the other hand, in Korea, it is not used a lot, and there is a large deviation in the quantity and quality of information acquired according to the experience and knowledge level of investigator. Unlike Bazzell's most well-known model, we designed a Korean-style OSINT-based profiling technique that considers the Korean web environment and provides timeline information, focusing on the improved workflow. The database schema to improve the efficiency of profiling is also presented. Using this, we can obtain search results that guarantee a certain level of quantity and quality. And it can also be used as a standard training course. To increase the effectiveness and efficiency of criminal investigations using this technique, it is necessary to strengthen the legal basis and to introduce automation technologies.

• Korean Security Journal
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• no.42
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• pp.361-391
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• 2015

Regarding the [Government Organization Act; which is legislated on 19th November, 2014] Korea Coast Guard(KCG) has been re-organized and belong from Korea Coast Guard shall be established under the Minister of Oceans and Fisheries to Ministry of Public Safety and Security. Furthermore, National Police Agency(NPA) Commissioner has the right for administer duties concerning investigation and information by succession from Korea Coast Guard Commissioner. That means that main rule has been moved from prior KCG to Ministry of Public Safety and Security(MPSS) and NPA currently which is dual structure. Meanwhile, This kind of organization change has been effective to investigative agency which exert KCG's call of duty and causes needs of variety problems. In other words, There are quite huge changes such as KCG's reduction of their work, call of duty and re-organization regarding revised government organization act. However this change - including re-organization by government, was not able to take current MPSS's special features such as organization specialty and legal rights. It means, the current change has not been taken present law system CRIMINAL PROCEDURE LAW and there was no preparation to stable maritime police authority action as well. To sum up, this revised GOVERNMENT ORGANIZATION ACT is supposed to provide total, quick security service by establishing strong disasters and safety control tower. However they only contains few area such as organization revision regarding 'Sewol Ferry Disaster', they was not able to contain the other parts of Society. Therefore, in this article I would like to check the part of re-evaluation of current change made by KCC's organization revision. It is supposed to provide better legal stability by making clear of work area by government agencies who acts maritime police authority.

• Korean Security Journal
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• no.43
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• pp.231-257
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• 2015

Today, the international community make every effort to suppress security crimes, to provide numerous institutional strategies and to prevent security crimes such as the terrorism and spy. Particularly, developed countries in the field of security are strengthening related legislation under new-security conditions. Things work a little differently about security crimes because the nation's benefit and protection of the law is the basis of individual benefit and protection of the law under investigation procedure of the security crimes. Therefore they have policy that permits major investigative agency under the arrest and detention procedure(e.g. security and communication monitoring ${\ldots}$). Criminal procedure's improvement and reinforcement are very important for events related security. But, The investigation procedure between criminal offense and security crimes makes no odds in the Korea. Continuance of such a national mood will accuse of not responding appropriately in preparation for new-security conditions recently. To revise with international best security legislation, We should institute a proper registration system in Korea's situation. This study have been discussing how to improve related legislation under new-security conditions through the cases analysis of the arrest and detention procedure in Korea.

• The Journal of the Korea institute of electronic communication sciences
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• v.11 no.1
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• pp.93-98
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• 2016

A large number of victims or witnesses to incidents and accidents should visit a police station and fill the decree stated. Stated decree workaround discomfort and hygienic problems in unnecessary step process using the fingerprint after you modify the modified portion when due modify the request as of the import or typos recognized that modifications and police in the. Stated decree in the investigation phase when creating KICS and electronic Resources investigation into the identity of the one-touch fingerprint reader linked with the introduction table system and thinning, which can simplify the day of the procedure.