diff --git a/.gitattributes b/.gitattributes
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index 00000000..0dbd0b60
--- /dev/null
+++ b/.gitattributes
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+# images and icons
+*.ico -text
+*.png -text
+
+# certificates and keys under tests/
+*.p12 -text
+*.der -text
+
+# SoftHSM objects
+*.object -text