Detecting child grooming behaviour patterns on social media

Online paedophile activity in social media has become a major concern in society as Internet access is easily available to a broader younger population. One common form of online child exploitation is child grooming, where adults and minors exchange sexual text and media via social media platforms. Such behaviour involves a number of stages performed by a predator (adult) with the final goal of approaching a victim (minor) in person. This paper presents a study of such online grooming stages from a machine learning perspective. We propose to characterise such stages by a series of features covering sentiment polarity, content, and psycho-linguistic and discourse patterns. Our experiments with online chatroom conversations show good results in automatically classifying chatlines into various grooming stages. Such a deeper understanding and tracking of predatory behaviour is vital for building robust systems for detecting grooming conversations and potential predators on social media

Penanaman Perilaku Asertif Pada Anak Usia Dini Sebagai Tindak Preventif Child Grooming

The development of the digital technology has changed many things, including crime, which is based on social media. Criminals easily use digital access to commit violence against children, including child grooming. The study was conducted to find preventive measures to prevent the occurrence of child grooming crimes by collecting reference materials for analysis using a library research approach. Based on the results of the analysis, parents can take preventive actions at home and teachers at school by instilling assertive behavior in children, so that children can openly convey what they want, feel, experience, or think. Also parents and teachers will find it easier to provide education about body parts that should not be touched on children

PERLINDUNGAN TERHADAP KORBAN GROOMING YANG DILAKUKAN OLEH NARAPIDANA PENCABULAN ANAK

Berkembangnya teknologi pada era globalisasi memiliki pengaruh yang besar untuk menunjukkan majunya suatu negara. Namun aspek negatif kerap timbul sejalan dengan banyaknya aspek positif  yang dihasilkan seperti munculnya modus tindak pidana baru berbasis elektronik, salah satu bentuknya yaitu tindak pidana grooming yang belum lama ini terjadi di Indonesia. Grooming memiliki makna pelecehan seksual terhadap anak dengan media sosial sebagai sarana. Mengingat anak menjadi korban utama dalam modus baru ini menjadikan penelitian ini penting dilakukan dalam rangka mengetahui lebih lanjut mengenai aturan sekaligus bentuk pencegahan dan perlindungan sebagai upaya menghindari maraknya tindak pidana grooming. Penelitian ini menggunakan metode yuridis normatif dengan menggunakan pendekatan kasus yaitu dengan menjabarkan fenomena grooming untuk mengetahui modus pelaku, pendekatan Undang-Undang, dan pendekatan konseptual dengan menjabarkan konsep, bentuk pencehahan dan perlindungan terhadap korban grooming dengan menggunakan beberapa instrumen hukum diantaranya Undang-Undang Nomor 35 Tahun 2014 tentang perubahan atas Undang-Undang Nomor 23 Tahun 2002 tentang Perlindungan Anak, Undang Nomor 44 Tahun 2008 tentang Pornografi dan Undang-Undang Nomor 19 Tahun 2016 tentang perubahan atas Undang-Undang Nomor 11 Tahun 2008 tentang Informasi dan Transaksi Elektronik

Online Sexual Predator Detection

Online sexual abuse is a concerning yet severely overlooked vice of modern society. With more children being on the Internet and with the ever-increasing advent of web-applications such as online chatrooms and multiplayer games, preying on vulnerable users has become more accessible for predators. In recent years, there has been work on detecting online sexual predators using Machine Learning and deep learning techniques. Such work has trained on severely imbalanced datasets, and imbalance is handled via manual trimming of over-represented labels. In this work, we propose an approach that first tackles the problem of imbalance and then improves the effectiveness of the underlying classifiers. Our evaluation of the proposed sampling approach on PAN benchmark dataset shows performance improvements on several classification metrics, compared to prior methods that otherwise require hands-crafted sampling of the data

False Identity Detection Using Complex Sentences

The use of faked identities is a current issue for both physical and online security. In this paper, we test the differences between subjects who report their true identity and the ones who give fake identity responding to control, simple, and complex questions. Asking complex questions is a new procedure for increasing liars' cognitive load, which is presented in this paper for the first time. The experiment consisted in an identity verification task, during which response time and errors were collected. Twenty participants were instructed to lie about their identity, whereas the other 20 were asked to respond truthfully. Different machine learning (ML) models were trained, reaching an accuracy level around 90-95% in distinguishing liars from truth tellers based on error rate and response time. Then, to evaluate the generalization and replicability of these models, a new sample of 10 participants were tested and classified, obtaining an accuracy between 80 and 90%. In short, results indicate that liars may be efficiently distinguished from truth tellers on the basis of their response times and errors to complex questions, with an adequate generalization accuracy of the classification models

Detecting psycho-anomalies on the world-wide web: current tools and challenges

The rise of the use of Social Media and the overall progress of technology has unfortunately opened new ways for criminals such as paedophiles, serial killers and rapists to exploit the powers that the technology offers in order to lure potential victims. It is of great need to be able to detect extreme criminal behaviours on the World-Wide Web and take measures to protect the general public from the effects of such behaviours. The aim of this chapter is to examine the current data analysis tools and technologies that are used to detect extreme online criminal behaviour and the challenges that exist associated with the use of these technologies. Specific emphasis is given to extreme criminal behaviours such as paedophilia and serial killing as these are considered the most dangerous behaviours. A number of conclusions are drawn in relation to the use and challenges of technological means in order to face such criminal behaviours

Improving moderator responsiveness in online peer support through automated triage

© 2019 Journal of Medical Internet Research. All rights reserved. Background: Online peer support forums require oversight to ensure they remain safe and therapeutic. As online communities grow, they place a greater burden on their human moderators, which increases the likelihood that people at risk may be overlooked. This study evaluated the potential for machine learning to assist online peer support by directing moderators' attention where it is most needed. Objective: This study aimed to evaluate the accuracy of an automated triage system and the extent to which it influences moderator behavior. Methods: A machine learning classifier was trained to prioritize forum messages as green, amber, red, or crisis depending on how urgently they require attention from a moderator. This was then launched as a set of widgets injected into a popular online peer support forum hosted by ReachOut.com, an Australian Web-based youth mental health service that aims to intervene early in the onset of mental health problems in young people. The accuracy of the system was evaluated using a holdout test set of manually prioritized messages. The impact on moderator behavior was measured as response ratio and response latency, that is, the proportion of messages that receive at least one reply from a moderator and how long it took for these replies to be made. These measures were compared across 3 periods: before launch, after an informal launch, and after a formal launch accompanied by training. Results: The algorithm achieved 84% f-measure in identifying content that required a moderator response. Between prelaunch and post-training periods, response ratios increased by 0.9, 4.4, and 10.5 percentage points for messages labelled as crisis, red, and green, respectively, but decreased by 5.0 percentage points for amber messages. Logistic regression indicated that the triage system was a significant contributor to response ratios for green, amber, and red messages, but not for crisis messages. Response latency was significantly reduced (P<.001), between the same periods, by factors of 80%, 80%, 77%, and 12% for crisis, red, amber, and green messages, respectively. Regression analysis indicated that the triage system made a significant and unique contribution to reducing the time taken to respond to green, amber, and red messages, but not to crisis messages, after accounting for moderator and community activity. Conclusions: The triage system was generally accurate, and moderators were largely in agreement with how messages were prioritized. It had a modest effect on response ratios, primarily because moderators were already more likely to respond to high priority content before the introduction of triage. However, it significantly and substantially reduced the time taken for moderators to respond to prioritized content. Further evaluations are needed to assess the impact of mistakes made by the triage algorithm and how changes to moderator responsiveness impact the well-being of forum members

Identificação de predadores sexuais brasileiros em conversas textuais na internet por meio de aprendizagem de máquina

Nos dias de hoje um grande número de crianças e adolescentes tem usado aplicações sociais. De fácil acesso, essas aplicações promovem benefícios e oportunidades. No entanto, ao mesmo tempo, expõem os usuários à diferentes riscos, dentre os quais a atividade predatória sexual. A atividade predatória sexual possui diversas finalidades como a obtenção de pornografia infantil, a extorsão e o abuso sexual. O presente trabalho possui três objetivos principais: (i) criar um conjunto de dados de conversas textuais contendo atividade sexual predatória real para o português do Brasil; (ii) realizar uma análise estatística das conversas textuais presentes nesse conjunto de dados; (iii) realizar uma avaliação experimental considerando os algoritmos de aprendizado de máquina mais populares no domínio da pesquisa com o conjunto de dados construído. Essa avaliação considera a medida de F1 como base. Os resultados alcançados com as contribuições (i) e (ii) possibilitam que novos estudos possam se concentrar na problemática da identificação de predadores sexuais em conversas textuais para o português do Brasil. Os resultados obtidos com a contribuição (iii) evidenciam que as Máquinas de vetores de suporte obtiveram o melhor comportamento, apresentando um resultado de 89.87%