Yubico Forum ...visit our web-store at 2013-04-24T03:13:28+01:00 https://forum.yubico.com/feed.php?f=26&t=1043 2013-04-24T03:13:28+01:00 2013-04-24T03:13:28+01:00 https://forum.yubico.com/viewtopic.php?t=1043&p=3911#p3911 <![CDATA[Re: [QUESTION] mifare classic reset+keylength]]> 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

Statistics: Posted by Jakob — Wed Apr 24, 2013 3:13 am

]]> 2013-04-19T10:19:46+01:00 2013-04-19T10:19:46+01:00 https://forum.yubico.com/viewtopic.php?t=1043&p=3904#p3904 <![CDATA[[QUESTION] mifare classic reset+keylength]]>
- 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?

Statistics: Posted by alfs — Fri Apr 19, 2013 10:19 am

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