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PostPosted: Fri Apr 19, 2013 10:19 am 
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Joined: Fri Apr 19, 2013 9:33 am
Posts: 1
I have some questions regarding the mifare classic chip in neo:

- Is the chip/content resettable? For example if access keys are forgotten, or if the access bits are borked by mistake when writing?

- a 7 byte UID is used, but it some readers (i.e. mine) only accepts 4 byte UID. Can this be configured?

- Is the MFC a javacard application, or a real/separate chip?


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PostPosted: Wed Apr 24, 2013 3:13 am 
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Joined: Wed May 28, 2008 7:04 pm
Posts: 263
Location: Yubico base camp in Sweden - Now in Palo Alto
alfs wrote:
I have some questions regarding the mifare classic chip in neo:

- Is the chip/content resettable? For example if access keys are forgotten, or if the access bits are borked by mistake when writing?

No - this is a true security chip so there are no back doors.

Quote:
- a 7 byte UID is used, but it some readers (i.e. mine) only accepts 4 byte UID. Can this be configured?

On a per batch basis, but it will require a sensible size order. NXP (owner of the Mifare technology) strongly suggests all system to go for 7-byte UIDs so we have this configured by default.

Quote:
- Is the MFC a javacard application, or a real/separate chip?

It is a real EAL5+ smartcard chip featuring a Javacard / JCOP execution environment. It is integrated so the same features are available both in USB- and NFC modes.

Best regards,

JakobE
Hardware- and firmware guy @ Yubico


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