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| [QUESTION] mifare classic reset+keylength https://forum.yubico.com/viewtopic.php?f=26&t=1043 |
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| Author: | alfs [ Fri Apr 19, 2013 10:19 am ] |
| Post subject: | [QUESTION] mifare classic reset+keylength |
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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| Author: | Jakob [ Wed Apr 24, 2013 3:13 am ] |
| Post subject: | 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 |
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