Publication Search

70,516 articles from 611 journals · 1,760 citations tracked

Showing 141-160 of 818

Analytics

Windi Astuti; Windi Astuti; Bambang Irawan; Nur Ariesanto Ramdhan

Jurnal Elektronika dan Komputer 2025 STEKOM PRESS

The development of social media platforms like TikTok has created new spaces for digital economic activities, including the practive of thrifting, which has now become a trend among the public. However, government policies that block these activities have sparked various public reactions. This study aims to analyze public sentiment regarding the issue of thrifting bans on the TikTok platform using the Bidirectional Long Short-Term Memory (Bi-LSTM) method. This method was chosen because it can understand text context from both directions, allowing it to capture deeper semantic meaning. The dataset consist of 4,000 TikTok user comments collected through a crawling process. The research stages include data preprocessing, sentiment labeling, splitting training and test data, training the Bi-LSTM model, and evaluating performance using accuracy, precision, recall, and F1-score metrics. The research results show that the Bi-LSTM model achieved an accuracy of 86.15%, with stable classification performance and minimal error rate. These findings indicate that Bi-LSTM is effective for sentiment analysis of public opinions on Indonesian language social media, particularly on context specific policy issues. Further development can be carried out by adding pre-trained embeddings or attention mechanisms to improve the model’s performance.

Bertitin Sule Sampe

Prosiding Seminar Nasional Manajemen dan Ekonomi 2025 Universitas Kristen Indonesia Toraja

This study aims to analyze the influence of the Live Streaming and Flash Sale features on TikTok Shop on purchasing decisions for Maybelline cosmetic products. The research employs a quantitative approach using a survey method, with a questionnaire distributed to 79 female students of the 2022 Management Program at the Faculty of Economics, Universitas Kristen Indonesia Toraja. Based on the analysis results, it was found that the Live Streaming feature has a positive and significant impact on purchasing decisions, while Flash Sale does not show a significant effect. Simultaneously, both variables have a significant effect on purchasing decisions, with an R² value of 15.1%. This indicates that other factors outside of the variables studied influence purchasing decisions by 84.9%. The findings suggest that the Live Streaming feature is more effective in influencing purchasing decisions compared to Flash Sale, highlighting the importance of utilizing interactive and real-time features to enhance consumer purchase intent on e-commerce platforms like TikTok Shop. This study provides insights for marketers in designing more targeted digital marketing strategies on social media platforms.

Syifa Ananda; Safira Ade Anggreini; Sintya Grace

Jurnal Bisnis Kreatif dan Inovatif 2025 Asosiasi Riset Ilmu Manajemen dan Bisnis Indonesia

The development of digital technology has encouraged companies to adjust their marketing strategies, one of which is by utilizing social media. Shopee, as one of the largest e-commerce platforms in Indonesia, actively uses social media to expand its market reach, enhance its brand image, and attract consumers. This study aims to analyze how Shopee uses social media in its marketing strategy, focusing on the types of strategies used and their effectiveness in influencing consumers. The research method used is a Google form. The analysis is conducted by collecting questionnaire results from people who have filled it out and comparing them with other results. The results show that Shopee uses social media through various approaches, such as collaborating with influencers, creating creative content, and running interactive promotional campaigns on platforms such as Instagram, TikTok, and YouTube. These strategies have proven effective in increasing brand awareness, building interactions with consumers, and encouraging customer loyalty and purchasing decisions. This study concludes that social media plays an important role in supporting the success of Shopee's marketing strategy. These findings are expected to serve as a reference for e-commerce companies and other businesses in developing effective digital marketing strategies.

Citra Tiku Datu Batara; Ade Lisa Matasik; Abedneigo C. Rambulangi

Prosiding Seminar Nasional Manajemen dan Ekonomi 2025 Universitas Kristen Indonesia Toraja

This study aims to analyze the influence of service quality on consumer satisfaction at Katorroan Cafe Batutumonga, North Toraja Regency. This research uses a quantitative associative method with a questionnaire as a data collection tool involving 60 respondents who are visitors to the cafe. Data analysis was carried out using descriptive analysis, validity test, reliability test, classical assumption test, simple linear regression analysis, and hypothesis testing (t-test). The results showed that the service quality at Katorroan Cafe Batutumonga was in the good category, and consumer satisfaction was in the satisfied category. However, the results of the simple linear regression test showed a negative and significant influence of service quality on consumer satisfaction with a regression coefficient of -0.404 and a significance value of 0.000. This indicates that an increase in service quality is paradoxically followed by a decrease in consumer satisfaction in the context of this study. The coefficient of determination (R²) is 0.195, meaning that service quality contributes 19.5% to consumer satisfaction, while the remaining 80.5% is influenced by other factors outside the study.

Danar Adi Wijanarko; Arina Mana Sikana; Rindy Pramitha Sari; Krisnawati Krisnawati

Jurnal Manajemen Kewirausahaan dan Teknologi 2025 Asosiasi Riset Ilmu Manajemen Kewirausahaan dan Bisnis Indonesia

This study aims to analyze the impact of content marketing, influencer marketing, and online customer reviews on the purchasing interest in Skintific products on TikTok among Generation Z students of the Bachelor of Management program at Universitas Semarang. Primary data was collected through a Google Form questionnaire distributed to Generation Z students using purposive sampling technique, based on the criteria of Generation Z age, active TikTok users, and familiarity with Skintific products. A quantitative approach was applied using multiple linear regression analysis after validity, reliability, normality, multicollinearity, and heteroscedasticity tests met the requirements. The results show that content marketing, influencer marketing, and online customer reviews individually have a significant positive effect on purchasing interest in Skintific products. Simultaneously, these three variables significantly influence purchasing interest, with a strong contribution. These findings imply that an integrated digital marketing strategy involving content marketing, influencer marketing, and online customer reviews is effective in increasing purchasing interest among Generation Z students on TikTok. This provides valuable insights for companies in designing more effective digital marketing campaigns to attract young consumers through social media platforms.

Ardini, Fhina; Amalia, Niesa; Ramadhan, Viona Putri; Syaputra, Adrian; Rizqa, Miftahir

Jurnal Budi Pekerti Agama Islam 2025 Asosiasi Riset Ilmu Pendidikan Agama dan Filsafat Indonesia

This study examines the inconsistency between the messages and behaviors of online preachers from Generation Z within the perspective of Islamic education. In the digital era, social media platforms such as TikTok, YouTube, and Instagram have become primary spaces for modern da’wah that are interactive and appealing to younger audiences. However, this advancement also presents significant challenges, particularly the dissonance between the Islamic values conveyed and the preacher’s actual behavior in the public sphere. This research employs a library research method by analyzing theories of communication, digital media, and Islamic education. The findings indicate that the main factors contributing to this inconsistency include algorithmic pressure from social media, commercialization of da’wah, lack of religious mentorship, and the digital culture of Gen Z that prioritizes popularity. From the standpoint of Islamic education, this phenomenon underscores the importance of integrating digital literacy, online preaching ethics, and character formation into both formal and non-formal educational curricula. Therefore, this study recommends strengthening the role of Islamic educational institutions in guiding young preachers so that digital da’wah remains ethical, educational, and truly reflective of authentic Islamic moral and spiritual values.

Dhony Priyo Suseno; Nur Ramdhani, Lily

Jurnal Teknik Sipil 2025 Faculty Of Engineering University 17 August 1945 Semarang

Audit Keselamatan Jalan (AKJ) sangat penting dalam proses pembagunan jalan untuk meminimalisir kecelakaan di jalan raya. Dengan adanya perencanaan pembangunan dengan penerapan konsep infrastruktur jalan berkeselamatan yang optimal, diharapkan dapat meminimalisir angka kecelakaan. Penelitian ini bertujuan untuk mengevaluasi sejauh mana pembangunan Jalan Lintas Selatan (JLS) Lot 3 Pantai Serang – Sumbersih, Kabupaten Blitar telah mengimplementasikan konsep infrastruktur jalan berkeselamatan berdasarkan standar yang berlaku. Penelitian ini dilakukan terhadap aspek geometrik jalan, perlengkapan jalan, dan bangunan pelengkap dengan metode kualitatif dan kuantitatif melalui studi literatur dan analisis data terhadap standar yang berlaku. Hasil dari penelitian menunjukkan bahwa sebagian besar komponen telah memenuhi kriteria jalan berkeselamatan, namun masih terdapat kekurangan teknis yang perlu diperhatikan antara lain nilai kelandaian memanjang maksimum, pemenuhan panjang tanjakan kritis, pemenuhan pelebaran pada tikungan, serta beberapa elemen perlengkapan jalan seperti rambu dan pagar pengaman. Rekomendasi perbaikan diberikan untuk mengoptimalkan penerapan prinsip-prinsip jalan berkeselamatan yaitu self-explaining, self-enforcing, dan forgiving road. Penelitian ini diharapkan menjadi referensi bagi perencana dan pemerintah dalam meningkatkan keselamatan infrastruktur jalan di masa mendatang. 

Safira Fegi Nisrina; Nisrina, Safira Fegi; Mulyono Mulyono; Basuki Rahmat

Jurnal Elektronika dan Komputer 2025 STEKOM PRESS

The problems in rice fields are complex and varied, depending on geographic location, rice variety, and growing season. Pests often cause serious economic losses. The Solar Sonic Repeller is an innovative portable pest control device designed to address pest problems by utilizing renewable energy, specifically solar energy. This product aims to offer an environmentally friendly and efficient solution. It works by emitting ultrasonic sound waves with a frequency of 30,000–40,000 Hz. The device's advantages lie in its portability and energy independence, thanks to the use of a charging module powered by an integrated photovoltaic (PV) panel with automatic battery charging during the day. The first test measured the output frequency using an oscilloscope to verify that the oscillator circuit produced waves at the specified frequency. The second test measured the device's effectiveness by examining the pest response to the device at various distances. This test was effective within a maximum radius of approximately 14 m from the center point, covering a rice field area of ​​250 m2.

Putri Sintia; Nur Fakhrunnisaa; M Arief

Jurnal Inovasi Pendidikan 2025 Lembaga Pengembangan Kinerja Dosen

The development of social media as a space for disseminating information has presented opportunities as well as challenges in religious learning for students. TikTok, as a digital platform that is popular among the younger generation, provides a variety of Islamic content with the theme of fiqh and morals that have the potential to affect users' religious understanding. This study aims to analyze the influence of Islamic content on TikTok with the theme of fiqh and morals on the religious knowledge of students of the PAI Study Program UIN Palopo. The research method used a quantitative approach with multiple linear regression analysis of 268 respondents selected through random sampling techniques. The results of the study show that the content of fiqh has a positive and significant effect on students' religious knowledge, so that content that contains explanations of the laws of worship can improve religious understanding. Moral content has also proven to be significant, especially because of the presentation of moral values that are simple and relevant to student life. Simultaneously, the two variables contributed 61.3% to the increase in religious knowledge. These findings confirm that TikTok plays a role as an effective informal learning medium, although the limitations of the duration of the content make the understanding formed not always deep. This research implies the need to strengthen digital literacy and students' critical attitudes in filtering religious content so that the understanding obtained is more comprehensive and accurate.

Raisha Maharani; Aceng Hidayat

Jurnal Riset Rumpun Seni, Desain dan Media 2025 Pusat Riset dan Inovasi Nasional

This study aims to analyze the content planning process and strategy on the TikTok account @Garudasystrain.id managed by PT Garuda Systrain Interindo. Using a qualitative descriptive approach through observation, interviews, literature review, and active participation during six months of Field Work Practice (PKL), this study describes how the company structures its social media workflow to support educational communication in the field of Occupational Safety and Health (K3). The results show that the content planning process is carried out through systematic stages, starting from trend research, idea gathering, content planning sheet preparation, upload scheduling, approval process, and weekly collaboration between team members. These stages ensure that the resulting content is relevant, consistent, and in line with the company's educational objectives. In addition, the content strategy is structured based on the Hierarchy of Effects Model, which includes the stages of awareness, knowledge, liking, preference, conviction, and action, so that the message delivery flow can encourage the audience from recognition to action. The use of clear and targeted Call to Action (CTA) also strengthens interaction and encourages audience participation. Overall, this approach helps PT Garuda Systrain Interindo in using TikTok strategies, improving the company's image, and strengthening the effectiveness of digital communications related to K3.

Muhammad Hanip; Arya Anggara; Rifa Nafisah; Yuni Ertinawati

Jurnal Kesehatan dan Kedokteran 2025 Lembaga Pengembangan Kinerja Dosen

This study investigates the influence of the vocabulary terms “selumbari” and “tulat” on efforts to develop and cultivate the Indonesian language, particularly through expanding public lexical awareness via social media. These two terms, originating from local linguistic traditions, possess significant potential to be integrated into modern Indonesian as part of cultural preservation and the strengthening of national linguistic identity. The research employed a descriptive quantitative method, collecting data through the dissemination of educational videos and Google Form questionnaires on social media platforms such as Instagram, WhatsApp, and TikTok. Respondents consisted of students, university students, the general public, and various other social groups. Analysis of responses from 20 participants revealed that most respondents had never heard or read the words “selumbari” and “tulat.” However, the majority stated that both words were easy to understand and contributed positively to vocabulary development in Indonesian. The findings indicate that social media plays a strategic role in introducing and popularizing new vocabulary to a wide audience. This study also highlights the importance of vocabulary enrichment as part of ongoing Indonesian language development, ensuring that the language remains adaptive to contemporary changes while representing local cultural richness. The implications of this research may serve as a reference for educators, linguistic institutions, and policymakers in formulating strategies to enhance vocabulary literacy, especially among younger generations.

Berkat Obed Sion Gultom; Yohanna Dwi Simaremare; Elprina Sihotang; Dionisius Sihombing; Fadli Agus Triansyah

Jurnal Nuansa : Publikasi Ilmu Manajemen dan Ekonomi Syariah 2025 Asosiasi Riset Ilmu Manajemen Kewirausahaan dan Bisnis Indonesia

The development of digital technology has changed the paradigm of MSME businesses, including in building brand image. This study analyzes strategies for enhancing brand image through digital business at Ayam Celup Juaro’s MSMEs in Medan City. The research method uses a qualitative approach with a case study design. Data were collected through in-depth interviews, participatory observation, and documentation studies. The results show that multi-platform digital integration (Instagram, TikTok, WhatsApp) is effective in building brand image. Instagram serves as a medium for visual representation of the brand, TikTok as a driver for acquiring new customers through viral content, and WhatsApp as a means of personal communication to maintain customer loyalty. The key factors for success are content consistency and timely service. The main obstacles faced are budget constraints and challenges in maintaining content consistency. This research provides practical contributions for SMEs in developing integrated digital strategies to enhance brand image in the era of the 4th Industrial Revolution.

Putra Kusdarmawan, Rahma; Putra Kusdarmawan, Rahma; Irdha Yunianto; Nuris Dwi Setiawan

JURNAL ILMIAH KOMPUTER GRAFIS 2025 UNIVERSITAS STEKOM

The development of digital technology has transformed how businesses build brand image through social media. This study aims to determine the role of creative content in enhancing the brand awareness of Sopiri Driving School through social media platforms such as Instagram and TikTok. The research method used is Research and Development (R&D) adapted from the Borg & Gall model, consisting of problem identification, design, development, testing, and evaluation stages. The study produced two promotional videos of 30 seconds each. The results showed that implementing creative content with storytelling and dynamic visuals significantly increased brand awareness. Trial data revealed that social media followers increased by more than 90%, and the engagement rate rose from 3.5% to 8.2% after the content was published. Moreover, 83% of survey respondents stated they recognized Sopiri Driving School after watching the promotional videos. The study concludes that creative content plays an essential role in building a professional brand image and attracting audiences through social media. An effective content strategy not only serves as a promotional tool but also as an interactive communication medium that strengthens the emotional bond between the brand and its audience.

Syahril, Syahril; Abadi Lubis, Dhifa Arifan; Darma, Welsa Arya; aziz, Abdul

Jurnal Global Citizen : Jurnal Ilmiah Kajian Pendidikan Kewarganegaraan 2025 Prodi PPKn Universitas Slamet Riyadi

The rise of digital technology has changed how young people access information, including political issues. TikTok, a short-video platform, has become a popular medium for first-time voters to engage with political content. This study aims to describe their understanding of political content on TikTok and its influence on political literacy. Using a qualitative approach with in-depth interviews of six informants in Pekanbaru, findings show that TikTok has potential as an accessible and engaging political literacy tool. However, most informants lacked critical skills in verifying content accuracy. The study concludes that although TikTok increases youth interest in politics, digital literacy and critical thinking must be improved to prevent misinterpretation of information.

Raymundus Anthony Samadi

Jurnal Penelitian Komunikasi dan Sosialisasi 2025 Asosiasi Peneliti dan Pengajar Ilmu Sosial Indonesia

Content commodification has become a dominant phenomenon within Indonesia’s digital ecosystem, where communication messages are no longer oriented toward use value such as education and enlightenment, but toward exchange value determined by algorithms, virality, and monetization potential. This transformation is evident in the behavior of content creators, online media, politicians, and government institutions that adjust their message formats to align with the logic of platforms such as TikTok, Instagram, and YouTube. Political content during the 2024 Election, clickbait practices in online journalism, and the aestheticization of public campaigns such as Bangga Buatan Indonesia(BBI) and Gerakan Kamis Pakai Lokal (GASPOL) demonstrate that content today is produced primarily to capture attention rather than to strengthen social literacy. Using a constructivist paradigm and a descriptive qualitative approach, this study analyzes how exchange value dominates meaning-making processes in digital spaces. Through the lenses of media political economy, cultural industries, and surveillance capitalism, the study shows that content commodification shifts the function of communication from a deliberative public sphere to a commercial arena governed by algorithms. These findings highlight the urgent need for digital literacy and communication ethics to safeguard the social role of media in Indonesia.

Setia Hidayah; Muhammad Zulfikar; Rosnani Siregar

International Journal of Communication, Tourism, and Social Economic Trends 2025 Asosiasi Penelitian dan Pengajar Ilmu Sosial Indonesia

Digital development has significantly influenced business practices, particularly for Micro, Small, and Medium Enterprises (MSMEs), which are required to adapt to technological changes in order to remain competitive. However, many MSMEs still rely on conventional marketing methods and have limited understanding of digital marketing and digital financial management. This community service program aims to strengthen MSMEs’ competitiveness through the implementation of digital marketing strategies that support market expansion and improve business sustainability. The program was conducted using a qualitative descriptive approach through a series of community service activities, including field observations, interviews, seminars, and mentoring sessions for MSME actors. The focus of the activities was to introduce and assist MSMEs in utilizing digital marketing platforms, particularly social media such as Instagram, TikTok, and Facebook, as well as online marketplaces, to promote products more effectively. In addition, MSME participants were introduced to basic digital financial applications to support more structured and transparent financial recording. The results of the community service activities indicate positive changes among MSME participants, including increased awareness of the importance of digital marketing, improved product branding, broader market reach beyond local areas, and better financial management practices compared to previous manual recording methods. The adoption of digital marketing strategies enabled MSMEs to communicate product information more efficiently and build consumer trust through online presence. This community service program demonstrates that digital marketing assistance combined with practical mentoring can enhance MSMEs’ competitiveness and contribute to improving community economic welfare. Continuous support and consistency from MSME actors are essential to ensure the sustainability of digital transformation initiatives.

Wardah, Jihan Syalina; Nugroho, David Rizar; Ulya, Enden Darjatul; Mulyono, Mulyono

Jurnal Penelitian Komunikasi dan Sosialisasi 2025 Asosiasi Peneliti dan Pengajar Ilmu Sosial Indonesia

This study aims to analyze the influence of entertainment content consumption on TikTok toward the stress levels of university students. TikTok has become one of the most frequently used social media platforms among young adults, offering entertainment, distraction, and emotional relief. Meanwhile, academic stress is a common issue among students due to heavy coursework, deadlines, and pressure to perform. This research uses a quantitative method with a survey distributed to 100 active university students aged 18–24 who own a TikTok account and consume entertainment content such as comedy, challenges, and viral videos. Data were analyzed using descriptive statistics and simple linear regression. The results show that the overall frequency of using TikTok for entertainment is very high (mean = 4.26), while the level of academic stress also falls into the high category (mean = 4.06). Regression analysis indicates that TikTok entertainment content significantly affects students’ stress levels (p < 0.001). Result found is positive, meaning higher TikTok usage is associated with higher stress. The significance value based on the simple linear regression coefficient table is 0.000 < 0.05, so it can be concluded that the variable Use of TikTok Entertainment Content (X) has an effect on the variable Stress Levels Among Students (Y).

Dinni Sabrina Bahri; Daniel Handoko

Jurnal Penelitian Komunikasi dan Sosialisasi 2025 Asosiasi Peneliti dan Pengajar Ilmu Sosial Indonesia

This study aims to determine the influence of Jejuby's TikTok content on the purchasing decisions of followers of the @jejubyofficial TikTok account. In today's digital age, social media platforms like TikTok have become one of the most effective promotional tools for reaching consumers, particularly in the beauty and skincare industry. Jejuby, as a local brand on the rise, actively leverages TikTok as a marketing platform by creating various types of content, including tutorials, testimonials, and visually appealing content. The theories used in this study are the Marketing Communication Theory with dimensions: Advertising, Sales Promotion, Personal Selling, Public Relations, and Direct and Digital Marketing. The Content Theory with dimensions: Credible, Shareable, Useful or Fun, Interesting, Relevant, Different, On Brand. The Purchase Decision Theory with dimensions: Need Recognition, Information Search, Evaluation of Alternatives, Purchase Decision, Post-Purchase Behavior. This study used a quantitative approach with a survey method. Sampling was conducted using simple random sampling and calculated using the Slovin formula with a margin of error of 5%. Data collection was carried out by distributing questionnaires to 92 respondents who were followers of the @jejubyofficial TikTok account. The research instrument was tested using validity and reliability tests, while data analysis was conducted using simple linear regression with a correlation coefficient (R) value of 0.711 in the strong category. The coefficient of determination (R²) value of 0.506 indicates that 50.6% of purchasing decisions are influenced by TikTok content, while 49.4% are influenced by other factors. The research results for TikTok content had an average of 3.47, while purchase decisions had an average of 3.54. The research results indicate that there is a significant influence between Jejuby's TikTok content and its followers' purchase decisions. This means that content packaged in a relevant manner and aligned with the brand's identity can influence consumers' decisions to purchase Jejuby products.

Nur’Fatimah Az-zahra; Nazwa Ramadhani; Rayhan Zahran Mustofa; Shaffa Helia

Jurnal Ilmu Sosial, Bahasa dan Pendidikan 2025 Pusat Riset dan Inovasi Nasional

This study examines the phenomenon of code-mixing among Generation Z in Banjarmasin, particularly in The comments section of TikTok content, which has become a primary digital expression space for young People. The aim of this study was to identify the forms, patterns, and social and cultural factors underlying This linguistic practice. Using descriptive qualitative methods with listening and note-taking techniques, Information was collected from comments on two TikTok posts on the accounts @BudRab and @Fazarbungaz. The findings indicate that the code-mixing that occurred was dominated by the insertion Of Banjarese elements into Indonesian (Banjar-Indonesian code-mixing), as well as a mixture of Banjarese, Indonesian, and English (Outer Code-mixing and Mixed Code-mixing). The forms of code-mixing found Included the insertion of Banjarese words, phrases, and lexical items such as kd (kada), makai, and mun. An analysis of the functions of code-mixing shows that this practice has a dual role: referential (for specific Local contexts), directive (to guide conversations), emotive/expressive (to indicate emotional closeness, for Example, longitude), and most importantly, as a marker of digital identity and cultural solidarity among Banjar speakers in the digital realm. This phenomenon confirms that social media serves as a new, flexible and essential space for the Banjar language to survive and negotiate with global and national languages. This study contributes to sociolinguistics by mapping the dynamics of language evolution among Gen Z in A digital context, highlighting the creative and social aspects of code-mixing.

Sefika Pradana

Federalisme : Jurnal Kajian Hukum dan Ilmu Komunikasi 2025 Asosiasi Peneliti dan Pengajar Ilmu Hukum Indonesia

The growth of digital transactions has made it easier for people to buy goods or services, including concert tickets. However, this convenience also increases the risk of fraud, especially through social media. The case of Golden Disc Award (GDA) 2024 ticket fraud on Twitter shows a systematic modus operandi, such as the use of fake accounts and identities, suspiciously cheap ticket prices, and the transfer of communication to private platforms. Victims suffer material and psychological losses, while perpetrators often disappear after receiving payment. Legally, these actions violate Article 378 of the Criminal Code, the Electronic Information and Transactions Law, and consumer rights as stipulated in the Consumer Protection Law (UUPK). This study emphasizes the importance of consumer protection in digital transactions, strengthening regulations, and improving public digital literacy to prevent fraudulent practices. Collaboration between the government, law enforcement agencies, concert organizers, digital platforms, and consumers is key to improving the security of online transactions.