Differences

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--- semi-invasive [2018/02/25 09:15] – mcmaster
+++ semi-invasive [2019/12/07 22:14] – W mcmaster
@@ Line 1: / Line 1: @@
-====== Photonic (UV) EPROM erase ======
+====== UV EPROM erase ======
 EPROM/EEPROM/flash can be erased by shining UV light or x-rays into the surrounding oxide. This slightly oxidizes it, letting the floating gate to drain out.
+===== Nail polish =====
+Usually a masking compound is applied to selectively block UV to the firmware, with red nail polish being the most popular or at least traditional.
+McMaster
+  - [[Revlon ColorStay Gel Envy Longwear Nail Enamel, Queen of Hearts|https://www.amazon.com/gp/product/B00LT8S30G/]]
+  - Bought at local store a while back and it seems to work well enough
+  - Bulk removal with acetone, but leaves some residue around edges
+  - Remaining residue softened with aceotne
+  - Remove using single hair brush if possible
+  - Can be more aggressive with PP monofilament wire
+  - Cold H2SO4 also works well. Wash with IPA then acetone
+    - Washing with water may really heat up the mixture
 ===== Angle =====
@@ Line 16: / Line 31: @@
-====== Non-invasive attacks ======
+====== X-ray EPROM erase ======
-[[jtag|JTAG]]
-[[ripping|Ripping firmware]]
-[[dpa|Differential power analysis]]
+TODO: add links to misc papers