Question 1

can we edit sector 0 with these. Also will the mifare app recognise these?

Accepted Answer

Ive bought these before but these dont work

Question 2

These fobs are encrypted ? could some clone using this machine? https://www.amazon.co.uk/gp/product/b00gypizg6/ref=ask_ql_qh_dp_hza

Accepted Answer

These  fobs are encrypted to Mifare Classic standard.  The encryption can be broken so you need to think carefully about in which application they can be used.  If you use the default keys these tags can be copied in a few seconds. If you use your own keys it might take  quite a few minutes, but note this is not likely to be done by someone standing next to you on the train for example.   They are ideal to give to yuor office staff to control access to the photocopier.   I have used them for a door  access system where they are used by club member in conjunction with a 6 digit pin number to get through the main door.  This is because I do not care if they can be copied. Think about it -  a normal physical key can be copied by any high street locksmith. You would have to copy these tags and know the persons pin number.   If the PIN is entered more than 4 times incorrectly the card is disabled.   So this is secure enough for us.  Many security systems have some kind of vulnerability but that doesn't mean they are useless. You need to consider the context in which these tags are to be used. If serious money or threat to property/persons is at stake then I suggest you get a professional security advisor to help you.

Question 3

Can you get a similar item where we can change uid/sector0?

Accepted Answer

Yes, it is possible to get tags/cards of the Mifare Class kind that allow you to rewrite the uid. Google is your friend. See https://www.amazon.co.uk/Mifare-Classic-Card-Changeable-Cards/dp/B00PNPWCGW for example.

Manufacturer	YARONG
Part Number	A1006
Package Dimensions	8 x 5.5 x 2 cm; 40 Grams
Manufacturer reference	A1006
Colour	Red
Material	Acrylonitrile Butadiene Styrene
Shape	Oval
Batteries included?	No
Batteries Required?	No
Item Weight	40 g

13.56mhz ISO14443A RFID 1K Fobs,Red Color ABS Waterproof Key (Pack of 10)

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