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33 lines
1.6 KiB
Markdown
33 lines
1.6 KiB
Markdown
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Theia
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=====
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Overview
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--------
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Theia is the worlds first FOSS malware scanner for Android. It is powered by ClamAV signature databases (GPLv3).
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Features
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--------
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- Near zero battery impact: you'll never notice any impact on battery at all
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- Extremely fast: it can scan small files (1MB) in <20ms, and even large files (40MB) in 1000ms.
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- Memory efficient: with the default databases enabled it uses under 120MB.
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- Regular scan: allowing selection of /system, internal storage, external storage, and installed apps
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- Realtime scanner: can detect malware in realtime on write/rename in internal storage
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- Completely offline: Internet is only used to download signature databases, files will never ever leave your device
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- Tiny codebase: coming in at under 1000 sloc, it can be audited by even someone with basic programming experience
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- Minimal dependencies: the app only uses libraries when necessary
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- Signature databases can be enabled/disabled at the users demand
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Technical Details
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------------------
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- Signature databases are ClavAV .hdb (MD5 hashes) and .hsb (SHA-1/SHA-256) format
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- Signature databases will not be redownloaded if the file hasn't changed on the server (304 not modified)
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- Realtime scanning powered by recursive FileObserver (Credit: @iNPUTmice)
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- Signatures are stored using HashMaps for O(1) lookup
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- Files have their MD5/SHA-1/SHA-256 hashes calculated in one pass
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Credits
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-------
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- Trove (GPLv3): A memory efficient replacement for Java's Collections
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- RecursiveFileObserver.java (GPLv3): Daniel Gultsch, ownCloud Inc., Bartek Przybylski
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- Icons (Apache-2.0): Google/Android/AOSP
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