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Как мы взломали биометрическую систему и получили за это 100 000 рублей

Команда KryptoNet компании «Криптонит» выступила в финале Всероссийского хакатона по биометрии и заняла третье место в решении задачи «атака на биометрическое представление». Команду представляли сотрудники лаборатории искусственного интеллекта. Это был крайне интересный опыт, которым спешим поделиться в статье.

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Призовой фонд хакатона, организованного Центром Биометрических Технологий, составил полтора миллиона рублей. Часто эпитет «всероссийский» добавляют просто ради звучного названия, но в этот раз конкурс был действительно масштабный. В нём приняли участие 55 команд из разных регионов страны. В финал прошли только 24 команды, включая нашу. В ходе заключительного этапа конкурса на выбор предложили три кейса. Мы выбрали кейс от СБП и Мир Plat.Form: «Создание инструмента для восстановления изображения из вектора биометрических персональных данных».

Формулировка задачи

По условию кейса произошла утечка данных из некоторой биометрической системы (БС). В результате неё злоумышленникам стали доступны изображения лиц и их биометрические представления (эмбеддинги).

От участников хакатона требовалось научиться генерировать фейковые портреты, которые смогут обмануть систему (или, говоря более строго — построить атаку на биометрическое представление). Используя перехваченные эмбеддинги, нужно было научиться генерировать новые изображения лиц, биометрические представления которых будут максимально близки к перехваченным.

При решении такого рода задач биометрическая система обычно представляет собой «чёрный ящик», но организаторы сообщили участникам конкурса об использовании в БС модели InsightFace buffalo_l, однако, пользоваться этим знанием для построения атаки было запрещено.

Объём утечки организаторы предложили оставить неизвестным. Команды должны были сами решить, сколько примеров им потребуется для построения атаки (конечно, чем меньше – тем лучше). Также в задаче требовалось самостоятельно определить порог, преодоление которого будет считаться успешной атакой и предложить метод защиты от подобных атак.

Замысел решения

Мы предположили, что хорошо сгенерированные фотореалистичные изображения лиц, близких с точки зрения одной биометрической системы, будут считаться близкими и в других БС. Это позволяет нам выбрать инструмент генерации близких изображений в любой БС. Если мы найдём такой инструмент, то построив по данным из утечки функцию-адаптер, переводящую эмбединги из пространства биометрической системы организаторов хакатона в пространство злоумышленника нашей команды, сможем решить исходную задачу.

В качестве инструмента был выбран Arc2Face — открытое решение для генерации изображений лиц с помощью Stable Diffusion v1.5. Все необходимые веса имеются в репозитории. Arc2Face строит лица, близкие в пространстве модели InsightFace antelopev2. Проведя серию тестов, мы убедились, что лица, полученные с помощью Arc2Face, с огромным запасом проходят все разумные пороги сравнения эмбеддингов, а также экспертный тест в задачах верификации и идентификации. Экспертами выступали члены команды.

Решение команды
Решение команды

Обучение адаптера эмбеддингов

Чтобы определить необходимый объём утечки данных, мы выбрали несколько подмножеств датасета WebFace42M для обучения адаптера.

Наши эксперименты показали, что чем разнообразнее выборка, тем лучше обучается адаптер. Мы зафиксировали обучающую подвыборку из 50 000 изображений лиц 10 000 человек. В качестве отложенной тестовой выборки мы использовали изображения 1 000 лиц. Результаты обучения перед вами:

• Loss-функция: MSE

• Метрика: MSE

• Значение метрики на отложенной выборке: 0.005

• Архитектура: CrossCovarianceAttentionBlock

Тестирование

По условиям хакатона для вычисления вероятности успеха атаки требовалось определить порог близости сравнения эмбеддингов. Мы его вычислили для задачи идентификации с фиксированной ошибкой fpr (false positive rate) = 1E-5, на подвыборке датасета WebFace42M из 500 000 изображений и 92 000 идентификаторов, и получили порог (threshold) = 0,62.

Согласно требованиям хакатона, мы проверили данный порог для задач идентификации и верификации на других датасетах из 1 000 изображений, на которых будет тестироваться атака, и получили fpr < 1E-5. Для тестирования мы выбрали несколько датасетов различного качества к задаче верификации, а качество измеряли с помощью модели diffiqa с открытым исходным кодом. Датасеты:

• WebFace HQ — подвыборка WebFace42M с изображениями высокого качества

• WebFace LQ — подвыборка WebFace42M с изображениями низкого качества

• CelebA HQ — подвыборка CelebA с изображениями высокого качества

• CelebA LQ — подвыборка CelebA с изображениями низкого качества

• KryptoData — 1000 изображений людей, которые никогда не видел интернет.

Также для тестирования было предоставлено два датасета от организаторов хакатона. Мы их назвали UbsData_v1, UbsData_v2.

Результаты тестирования

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Примеры сгенерированных лиц для тестового датасета организаторов хакатона

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Мы пошли дальше и решили опробовать ещё более смелую идею: создать гибридное изображение, которое бы проходило верификацию сразу для двух пользователей. Результат перед вами.

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Смешивание биометрических параметров двух совершенно непохожих людей даёт химеру, которая обманывает БС и позволяет аутентифицироваться от имени обеих персон.

Защита

В качестве меры противодействия атаке мы предложили недетерменированным образом маскировать передаваемые данные. Мы рассмотрели несколько способов маскирования:

• использовать сумму случайного количества биометрических представлений от случайно выбранных биометрических систем;

• дополнять их случайными данными (выполняя конкатенацию со случайными векторами) в случайном порядке;

• применять одну из заранее определённых перестановок (перемешивать координаты передаваемого вектора).

Отметим, что количество суммируемых эмбеддингов от разных вендоров должно быть сравнительно низким из-за накапливаемой ошибки верификации. Общее количество вендоров также не может быть большим. Дополнять значимым количеством случайных данных тоже не выйдет, так как это повышает нагрузку на канал связи.

На этом фоне перемешивание координат вектора выглядит как наиболее жизнеспособный вариант. Общее количество возможных перестановок вычисляется как факториал от количества координат в векторе. Поэтому в качестве «финальной» защиты мы предложили использовать одну случайную перестановку из множества заранее выбранных перестановок, определенных биометрической системой.

Минусы

• Увеличение времени этапа сравнения биометрического представления с эталоном в W раз, где W — количество заранее заготовленных перестановок координат биометрического представления.

Плюсы

• не требуется наличие нескольких биометрических систем;

• увеличение необходимого количества перехваченных злоумышленником данных как минимум в W раз.

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Выводы

Наша работа наглядно показала, что перехват или утечка биометрических данных вместе с биометрическим представлением компрометирует вендора биометрических систем.

Само построение атаки не требует больших вычислительных ресурсов. Для генерации изображений мы использовали RTX 3090, чистое время одной атаки составило около 1 секунды, но с менее производительным ускорителем атака тоже возможна, просто займёт больше времени.

Сгенерированное описанным выше способом изображение настолько консистентно, что проходит верификацию даже в других биометрических системах (поскольку все они работают на схожих алгоритмах).

Усложнение процедуры верификации кратно снижает угрозу успешной атаки на биометрическое представление.

На вероятность успешной атаки влияет качество перехваченного изображения. Потенциально для всех, кто выкладывает фотографии в социальные сети, могут быть созданы изображения лица подобным образом.

Атаковать способом, подобным нашему, пробовало ещё 3 команды соперников. Ознакомиться с решениями разных команд можно в видеозаписи презентаций решений финала хакатона.

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    "In the crypto world, this is great news I want to share. Last year, I fell victim to a scam disguised as a safe investment option. I have invested in crypto trading platforms for about 10yrs thinking I was ensuring myself a retirement income, only to find that all my assets were either frozen, I believed my assets were secure — until I discovered that my BTC funds had been frozen and withdrawals were impossible. It was a devastating moment when I realized I had been scammed, and I thought my Bitcoin was gone forever, Everything changed when a close friend recommended the Capital Crypto Recover Service. Their professionalism, expertise, and dedication enabled me to recover my lost Bitcoin funds back — more than €560.000 DEM to my BTC wallet. What once felt impossible became a reality thanks to their support. If you have lost Bitcoin through scams, hacking, failed withdrawals, or similar challenges, don’t lose hope. I strongly recommend Capital Crypto Recover Service to anyone seeking a reliable and effective solution for recovering any wallet assets. They have a proven track record of successful reputation in recovering lost password assets for their clients and can help you navigate the process of recovering your funds. Don’t let scammers get away with your hard-earned money – contact Email: [email protected] Phone CALL/Text Number: +1 (336) 390-6684 Contact: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 12.10.25 01:12 harristhomas7376

    "In the crypto world, this is great news I want to share. Last year, I fell victim to a scam disguised as a safe investment option. I have invested in crypto trading platforms for about 10yrs thinking I was ensuring myself a retirement income, only to find that all my assets were either frozen, I believed my assets were secure — until I discovered that my BTC funds had been frozen and withdrawals were impossible. It was a devastating moment when I realized I had been scammed, and I thought my Bitcoin was gone forever, Everything changed when a close friend recommended the Capital Crypto Recover Service. Their professionalism, expertise, and dedication enabled me to recover my lost Bitcoin funds back — more than €560.000 DEM to my BTC wallet. What once felt impossible became a reality thanks to their support. If you have lost Bitcoin through scams, hacking, failed withdrawals, or similar challenges, don’t lose hope. I strongly recommend Capital Crypto Recover Service to anyone seeking a reliable and effective solution for recovering any wallet assets. They have a proven track record of successful reputation in recovering lost password assets for their clients and can help you navigate the process of recovering your funds. Don’t let scammers get away with your hard-earned money – contact Email: [email protected] Phone CALL/Text Number: +1 (336) 390-6684 Contact: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 12.10.25 19:53 Tonerdomark

    A crook swiped my Dogecoin. It ruined my whole world. Then Mr. Sylvester showed up. He fixed it all. He pulled back €211,000 for me. Not one cent missing from my profits. His steady cool and sharp tech know-how won back my trust. I got my money smooth and sound. After endless worry, relief hit me hard. I trusted him completely. Lost cash to a scam? Hit him up now at { yt7cracker@gmail . com }. His aid turned my life around. WhatsApp at +1 512 577 7957.

  • 12.10.25 21:36 blessing

    Writing this review is a joy. Marie has provided excellent service ever since I started working with her in early 2018. I was worried I wouldn't be able to get my coins back after they were stolen by hackers. I had no idea where to begin, therefore it was a nightmare for me. However, things became easier for me after my friend sent me to [email protected] and +1 7127594675 on WhatsApp. I'm happy that she was able to retrieve my bitcoin so that I could resume trading.

  • 13.10.25 01:11 elizabethrush89

    God bless Capital Crypto Recover Services for the marvelous work you did in my life, I have learned the hard way that even the most sensible investors can fall victim to scams. When my USD was stolen, for anyone who has fallen victim to one of the bitcoin binary investment scams that are currently ongoing, I felt betrayal and upset. But then I was reading a post on site when I saw a testimony of Wendy Taylor online who recommended that Capital Crypto Recovery has helped her recover scammed funds within 24 hours. after reaching out to this cyber security firm that was able to help me recover my stolen digital assets and bitcoin. I’m genuinely blown away by their amazing service and professionalism. I never imagined I’d be able to get my money back until I complained to Capital Crypto Recovery Services about my difficulties and gave all of the necessary paperwork. I was astounded that it took them 12 hours to reclaim my stolen money back. Without a doubt, my USDT assets were successfully recovered from the scam platform, Thank you so much Sir, I strongly recommend Capital Crypto Recover for any of your bitcoin recovery, digital funds recovery, hacking, and cybersecurity concerns. You reach them Call/Text Number +1 (336)390-6684 His Email: [email protected] Contact Telegram: @Capitalcryptorecover Via Contact: [email protected] His website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 13.10.25 01:11 elizabethrush89

    God bless Capital Crypto Recover Services for the marvelous work you did in my life, I have learned the hard way that even the most sensible investors can fall victim to scams. When my USD was stolen, for anyone who has fallen victim to one of the bitcoin binary investment scams that are currently ongoing, I felt betrayal and upset. But then I was reading a post on site when I saw a testimony of Wendy Taylor online who recommended that Capital Crypto Recovery has helped her recover scammed funds within 24 hours. after reaching out to this cyber security firm that was able to help me recover my stolen digital assets and bitcoin. I’m genuinely blown away by their amazing service and professionalism. I never imagined I’d be able to get my money back until I complained to Capital Crypto Recovery Services about my difficulties and gave all of the necessary paperwork. I was astounded that it took them 12 hours to reclaim my stolen money back. Without a doubt, my USDT assets were successfully recovered from the scam platform, Thank you so much Sir, I strongly recommend Capital Crypto Recover for any of your bitcoin recovery, digital funds recovery, hacking, and cybersecurity concerns. You reach them Call/Text Number +1 (336)390-6684 His Email: [email protected] Contact Telegram: @Capitalcryptorecover Via Contact: [email protected] His website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 14.10.25 01:15 tyleradams

    Hi. Please be wise, do not make the same mistake I had made in the past, I was a victim of bitcoin scam, I saw a glamorous review showering praises and marketing an investment firm, I reached out to them on what their contracts are, and I invested $28,000, which I was promised to get my first 15% profit in weeks, when it’s time to get my profits, I got to know the company was bogus, they kept asking me to invest more and I ran out of patience then requested to have my money back, they refused to answer nor refund my funds, not until a friend of mine introduced me to the NVIDIA TECH HACKERS, so I reached out and after tabling my complaints, they were swift to action and within 36 hours I got back my funds with the due profit. I couldn’t contain the joy in me. I urge you guys to reach out to NVIDIA TECH HACKERS on their email: [email protected]

  • 14.10.25 08:46 robertalfred175

    CRYPTO SCAM RECOVERY SUCCESSFUL – A TESTIMONIAL OF LOST PASSWORD TO YOUR DIGITAL WALLET BACK. My name is Robert Alfred, Am from Australia. I’m sharing my experience in the hope that it helps others who have been victims of crypto scams. A few months ago, I fell victim to a fraudulent crypto investment scheme linked to a broker company. I had invested heavily during a time when Bitcoin prices were rising, thinking it was a good opportunity. Unfortunately, I was scammed out of $120,000 AUD and the broker denied me access to my digital wallet and assets. It was a devastating experience that caused many sleepless nights. Crypto scams are increasingly common and often involve fake trading platforms, phishing attacks, and misleading investment opportunities. In my desperation, a friend from the crypto community recommended Capital Crypto Recovery Service, known for helping victims recover lost or stolen funds. After doing some research and reading multiple positive reviews, I reached out to Capital Crypto Recovery. I provided all the necessary information—wallet addresses, transaction history, and communication logs. Their expert team responded immediately and began investigating. Using advanced blockchain tracking techniques, they were able to trace the stolen Dogecoin, identify the scammer’s wallet, and coordinate with relevant authorities to freeze the funds before they could be moved. Incredibly, within 24 hours, Capital Crypto Recovery successfully recovered the majority of my stolen crypto assets. I was beyond relieved and truly grateful. Their professionalism, transparency, and constant communication throughout the process gave me hope during a very difficult time. If you’ve been a victim of a crypto scam, I highly recommend them with full confidence contacting: 📧 Email: [email protected] 📱 Telegram: @Capitalcryptorecover Contact: [email protected] 📞 Call/Text: +1 (336) 390-6684 🌐 Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 14.10.25 08:46 robertalfred175

    CRYPTO SCAM RECOVERY SUCCESSFUL – A TESTIMONIAL OF LOST PASSWORD TO YOUR DIGITAL WALLET BACK. My name is Robert Alfred, Am from Australia. I’m sharing my experience in the hope that it helps others who have been victims of crypto scams. A few months ago, I fell victim to a fraudulent crypto investment scheme linked to a broker company. I had invested heavily during a time when Bitcoin prices were rising, thinking it was a good opportunity. Unfortunately, I was scammed out of $120,000 AUD and the broker denied me access to my digital wallet and assets. It was a devastating experience that caused many sleepless nights. Crypto scams are increasingly common and often involve fake trading platforms, phishing attacks, and misleading investment opportunities. In my desperation, a friend from the crypto community recommended Capital Crypto Recovery Service, known for helping victims recover lost or stolen funds. After doing some research and reading multiple positive reviews, I reached out to Capital Crypto Recovery. I provided all the necessary information—wallet addresses, transaction history, and communication logs. Their expert team responded immediately and began investigating. Using advanced blockchain tracking techniques, they were able to trace the stolen Dogecoin, identify the scammer’s wallet, and coordinate with relevant authorities to freeze the funds before they could be moved. Incredibly, within 24 hours, Capital Crypto Recovery successfully recovered the majority of my stolen crypto assets. I was beyond relieved and truly grateful. Their professionalism, transparency, and constant communication throughout the process gave me hope during a very difficult time. If you’ve been a victim of a crypto scam, I highly recommend them with full confidence contacting: 📧 Email: [email protected] 📱 Telegram: @Capitalcryptorecover Contact: [email protected] 📞 Call/Text: +1 (336) 390-6684 🌐 Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 14.10.25 08:46 robertalfred175

    CRYPTO SCAM RECOVERY SUCCESSFUL – A TESTIMONIAL OF LOST PASSWORD TO YOUR DIGITAL WALLET BACK. My name is Robert Alfred, Am from Australia. I’m sharing my experience in the hope that it helps others who have been victims of crypto scams. A few months ago, I fell victim to a fraudulent crypto investment scheme linked to a broker company. I had invested heavily during a time when Bitcoin prices were rising, thinking it was a good opportunity. Unfortunately, I was scammed out of $120,000 AUD and the broker denied me access to my digital wallet and assets. It was a devastating experience that caused many sleepless nights. Crypto scams are increasingly common and often involve fake trading platforms, phishing attacks, and misleading investment opportunities. In my desperation, a friend from the crypto community recommended Capital Crypto Recovery Service, known for helping victims recover lost or stolen funds. After doing some research and reading multiple positive reviews, I reached out to Capital Crypto Recovery. I provided all the necessary information—wallet addresses, transaction history, and communication logs. Their expert team responded immediately and began investigating. Using advanced blockchain tracking techniques, they were able to trace the stolen Dogecoin, identify the scammer’s wallet, and coordinate with relevant authorities to freeze the funds before they could be moved. Incredibly, within 24 hours, Capital Crypto Recovery successfully recovered the majority of my stolen crypto assets. I was beyond relieved and truly grateful. Their professionalism, transparency, and constant communication throughout the process gave me hope during a very difficult time. If you’ve been a victim of a crypto scam, I highly recommend them with full confidence contacting: 📧 Email: [email protected] 📱 Telegram: @Capitalcryptorecover Contact: [email protected] 📞 Call/Text: +1 (336) 390-6684 🌐 Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 15.10.25 18:07 crypto

    Cryptocurrency's digital realm presents many opportunities, but it also conceals complex frauds. It is quite painful to lose your cryptocurrency to scam. You can feel harassed and lost as a result. If you have been the victim of a cryptocurrency scam, this guide explains what to do ASAP. Following these procedures will help you avoid further issues or get your money back. Communication with Marie ([email protected] and WhatsApp: +1 7127594675) can make all the difference.

  • 15.10.25 21:52 harristhomas7376

    "In the crypto world, this is great news I want to share. Last year, I fell victim to a scam disguised as a safe investment option. I have invested in crypto trading platforms for about 10yrs thinking I was ensuring myself a retirement income, only to find that all my assets were either frozen, I believed my assets were secure — until I discovered that my BTC funds had been frozen and withdrawals were impossible. It was a devastating moment when I realized I had been scammed, and I thought my Bitcoin was gone forever, Everything changed when a close friend recommended the Capital Crypto Recover Service. Their professionalism, expertise, and dedication enabled me to recover my lost Bitcoin funds back — more than €560.000 DEM to my BTC wallet. What once felt impossible became a reality thanks to their support. If you have lost Bitcoin through scams, hacking, failed withdrawals, or similar challenges, don’t lose hope. I strongly recommend Capital Crypto Recover Service to anyone seeking a reliable and effective solution for recovering any wallet assets. They have a proven track record of successful reputation in recovering lost password assets for their clients and can help you navigate the process of recovering your funds. Don’t let scammers get away with your hard-earned money – contact Email: [email protected] Phone CALL/Text Number: +1 (336) 390-6684 Contact: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

  • 15.10.25 21:52 harristhomas7376

    "In the crypto world, this is great news I want to share. Last year, I fell victim to a scam disguised as a safe investment option. I have invested in crypto trading platforms for about 10yrs thinking I was ensuring myself a retirement income, only to find that all my assets were either frozen, I believed my assets were secure — until I discovered that my BTC funds had been frozen and withdrawals were impossible. It was a devastating moment when I realized I had been scammed, and I thought my Bitcoin was gone forever, Everything changed when a close friend recommended the Capital Crypto Recover Service. Their professionalism, expertise, and dedication enabled me to recover my lost Bitcoin funds back — more than €560.000 DEM to my BTC wallet. What once felt impossible became a reality thanks to their support. If you have lost Bitcoin through scams, hacking, failed withdrawals, or similar challenges, don’t lose hope. I strongly recommend Capital Crypto Recover Service to anyone seeking a reliable and effective solution for recovering any wallet assets. They have a proven track record of successful reputation in recovering lost password assets for their clients and can help you navigate the process of recovering your funds. Don’t let scammers get away with your hard-earned money – contact Email: [email protected] Phone CALL/Text Number: +1 (336) 390-6684 Contact: [email protected] Website: https://recovercapital.wixsite.com/capital-crypto-rec-1

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