Top 8 Kotlin Security Projects

Photok

3 277 6.2 Kotlin

Encrypted Photo Safe for Android

Project mention: Secure card storage? | reddit.com/r/fossdroid | 2023-01-02

Also I found one Photok its available on Izzyondroid repository.
Wasted

9 243 7.3 Kotlin

Lock and wipe on emergency.

Project mention: Enhanched security | reddit.com/r/GrapheneOS | 2023-01-02
Appwrite

appwrite.io
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Appwrite - The Open Source Firebase alternative introduces iOS support. Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
accrescent

14 208 9.0 Kotlin

A novel Android app store focused on security, privacy, and usability

Project mention: F-Droid or Play Store? | reddit.com/r/fossdroid | 2023-01-17

I'm simply providing more information that gives another perspective on F-droid which is what the OP asked for. I don't know why I got so many downvotes or why you're implying that I am one of these people which think F-droid is bad. The comment you quote certainly has it's own merit that offers a good counter point. There is however an upcoming better Foss store in my opinion called Accrescent.
Android Tamper Detector

1 131 0.0 Kotlin

A simple library that can help you detect if you app is modded or tampered with

Project mention: What's the best way to prevent hackers from modding my app? | reddit.com/r/androiddev | 2022-10-06

I also found this library, to check for tamper and then taking it from there.
Secure-File-Manager

3 122 3.6 Kotlin

Secure File Manager is open source file manager for keeping your files in safe.

Project mention: An app I rarely see be suggested is DroidFS, but I think it deserves more credit | reddit.com/r/privacy | 2022-08-02

It is cool, I suggest it. Another similar application is Secure-File-Manager but I am not using it 'cause it's still in Alpha/Beta.
Wristkey

4 83 0.0 Kotlin

A free and open-source 2FA app for smartwatches.

Project mention: Features which expand the functionality of the watch | reddit.com/r/GalaxyWatch | 2023-02-01

2 factor authentication/security keys using https://github.com/jamie-mh/AuthenticatorPro, https://github.com/4f77616973/Wristkey, https://github.com/fmeum/WearAuthn
Sentry

3 46 1.8 Kotlin

Enforce security policies. (by x13a)

Project mention: Best alternative apps not on playstore | reddit.com/r/androidapps | 2022-12-17
InfluxDB

www.influxdata.com
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Build time-series-based applications quickly and at scale.. InfluxDB is the Time Series Platform where developers build real-time applications for analytics, IoT and cloud-native services. Easy to start, it is available in the cloud or on-premises.
IYPS

0 28 6.7 Kotlin

A password strength test app with strength, estimated crack times, warnings and suggestions to help make better passwords.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-02-01.