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In the talk titled "Prevent Account Sharing," presented by Andrei Kaleshka at the wroc_love.rb 2024 event, the focus is on addressing the challenges of account sharing, particularly in the context of user authentication in applications. Kaleshka begins by sharing a personal anecdote from his school days, illustrating the difficulties of sharing limited resources, which parallels the issues faced with account sharing today. He identifies two main problems: credential theft and unauthorized account sharing among friends and family.

Key points discussed include:
- **Initial Challenges**: Account sharing leads to security issues and revenue loss, prompting the need for a solution that balances user experience and security.
- **Solution Exploration**: Kaleshka explores various methods, including third-party fingerprint authentication, IP address analysis, and logs, ultimately finding them complex and insufficient.
- **Multi-Factor Authentication (MFA)**: He proposes implementing MFA but acknowledges user resistance due to potential login complications. A data-driven approach is employed to analyze the impacts of MFA before broad implementation.
- **Data Collection**: The team establishes a strategy to track key indicators, such as sign-ups, user retention, and session counts, using tools like the Paper Trail gem for data logging and Metabase for visualization.
- **Results of Implementation**: Initial findings indicate an increase in login sessions per user, coupled with a decline for users flagged for MFA, suggesting some success in curbing account sharing.
- **Future Plans**: The application plans to limit active user sessions to four to manage account sharing while enhancing user engagement through data analysis.
- **Conclusion**: Kaleshka asserts that while MFA implementation improved security significantly, further investigation is needed to understand user behaviors thoroughly.

In conclusion, the presentation emphasizes the importance of defining clear indicators to assess the impact of new security measures and the necessity of maintaining a user-friendly experience. Ultimately, proper implementation of MFA can bolster application security and revenue health, while the journey remains ongoing as the team navigates the complexities of user behavior and session management.

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