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@@ -32,37 +32,37 @@ There are some situations when the offline loclass may not find a key, such as:
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* Custom keyed readers using Standard KDF
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* Custom keyed readers using SE KDF
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# NR-MAC read
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# NR-MAC Attack
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Due to the nature of how secure picopass works, it is possible to emulate some public fields from a card and capture the reader's response, which can be used to authenticate. Two of the pieces involved in this are the NR and MAC. This allows you to get a dump of the card, except for the key, even if you don't know the key. For picopass in non-HID systems this can allow you to see what the data looks like. For iClass SE the data is encrypted (SIO), but a friend with a HID SAM can decrypt it.
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Due to the nature of how secure mode picopass works, it is possible to emulate some public fields from a card and capture the reader's response, which can be used to authenticate. Two of the pieces involved in this are the `NR` and `MAC`. This allows you to get a dump of the card, except for the key, even if you don't know the key. For picopass in non-HID systems this can allow you to see what the data looks like. For iClass SE the data (SIO) is encrypted, but a friend with a HID SAM can decrypt it.
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*These instructions are intended to be performed all at the same time. If you use the card with the reader between Card Part 1 and Card Part 2, then Card Part 2 will fail.*
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## Card Part 1
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## First: Card Part 1
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1. Place card against Flipper Zero
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2. Run _Read_ from the picopass main menu
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3. Get a "Read Failed" message
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4. Select the "Menu" option
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5. Select "Save Partial" (regardless if this card has been saved previously)
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6. Name file something you'll remember
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7. Immediately proceed to Reader Part
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7.*Immediately* proceed to Reader Part
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## Reader Part
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## Second: Reader Part
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1. Select _Saved_ from the picopass main menu
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2. Select the file name you saved in last step of Card Part 1
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3. Select _Emulate_
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4. Expose Flipper Zero to reader (It may work better a few inches from the reader, as opposed to physically touching)
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5. Flipper will buzz and screen will say "NR-MAC Saved!"
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6. Immediately proceed to Card Part 2
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5. Flipper will buzz and screen will say "NR-MAC Saved!" (may be very brief)
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6.*Immediately* proceed to Card Part 2
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## Card Part 2
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## Third: Card Part 2
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1. Place card against Flipper Zero
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2. Run _Read_ from the picopass main menu
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3. Card will authenticate and read
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4. Suggested to both "Save" the card and "Save as Seader"
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4. Suggested to do both "Save" and "Save as Seader"
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