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awesome-mobile-security
An effort to build a single place for all useful android and iOS security related stuff. All references and tools belong to their respective owners. I'm just maintaining it.
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capillary
Discontinued Capillary is a library to simplify the sending of end-to-end encrypted push messages from Java-based application servers to Android clients.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
I remember reading that flutter/dart article. Unfortunately, I didn't save it. Speaking of resources, I plan to compile recent articles and other security resources relevant to Flutter security. It should be aligned with OWASP MAS or as a contribution to https://github.com/vaib25vicky/awesome-mobile-security . I aim to popularize security knowledge amongst the Flutter community because it is way behind other platforms. Thank you for your feedback!
You are right about the PSK approach. You may also be interested in Capillary: https://github.com/google/capillary (not available for Flutter). If you additionally need to guarantee the protection for individual PSK keys, you can use the mobile app and device integrity state control .