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- #Cracking mifare ultralight 32 bit
- #Cracking mifare ultralight for android
- #Cracking mifare ultralight password
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To prevent the kind of abuse above, you need a way that:
#Cracking mifare ultralight password
The 32bits password protection only prevents from modifying the content of the tag unless you know the password (since I doubt you'll use the password to set a "no-access" zone), but anyone with a simple $100 tool can capture the password when operating a valid tag since it's transmitted in clear (MITM here), so it's useless as I understand your need. Please notice that even if you are checking the balance online with a database (per-tag) to limit case 1, you can't prevent case 2 with your scheme. Share with someone else account (if you leave your tag unattended, some attacker can copy it and paste it on another tag, impersonnating you for further purchase).Restore the account balance (if it's what stored on the tag) to what was before the purchase (simply by copy the tag before purchase and restore after purchase).
![cracking mifare ultralight cracking mifare ultralight](http://www.tagprint.com.my/wp-content/uploads/AAEAAQAAAAAAAAlxAAAAJDIzYTA3M2JjLWFkYTMtNGMxYy1iN2IxLTlmYjRhMTYxNGRhNw.jpg)
Yet she can still copy a (valid) message you've created and paste it on any other tag or restore to a previous state. With your code, an attacker will not be able to forge a valid message for your system.
#Cracking mifare ultralight 32 bit
Would you (and that's a personal opinion) say that Ntag213 with application level encryption and 32 bit password good enough for this type of application? And how long would it take someone to actually break its security? Question 5) I see a bunch of other techs (Mifare Desfire, ICODE SLIX, Infineon Cipurse) that are more secure, which makes me wonder if the tech I'm using (Ntag213 or Ultralight C) is good enough for storing someones balance. Question 4) When you compare tag security (Mifare Desfire > Ultralight > Ntag213 > Mifare Classic), what is really being compared? The ease of one cracking the (native tag's) encryption or the ease of one store (anything) on the tag without permission ?
#Cracking mifare ultralight for android
Question 3) Which other security measures can I use on such tags to enforce security (tag and application layer)? I see that Ultralight C has 3DES Authentication, but I haven't find an example for Android so far. Is it good enough? Is there another way of preventing someone (besides me) writing data? However, both Ntag213 and Ultralight C have only an 32 bit password. I see that the only way of preventing that (please, correct me if I'm wrong) is to set a password for the tag. Question 2) I'm pretty sure I can guarantee security using AES encryption on application layer, but I don't want people (besides me) messing with the stored data (formatting tag or writing info there - even if I can dettect it). Question 1) When using application level encryption, why (is it?) is Ultralight C safer then Ntag213? **I know both tags have limited space but it is more than enough for me. On my research, I've found that when it comes to security Ultralight C > Ntag213. So far so good - Only I can understand the data on the tags. Ndef.writeNdefMessage(new NdefMessage(mimeRecord)) Īs you can notice, I'm using application level encryption to encrypt the message ( messageEncrypted) before writing it to the tag (AES-256 encrypt with 'com.scottyab:aescrypt:0.0.1' library - with a very big password key which is also combined with each tag UUID as part of it). NdefRecord mimeRecord = NdefRecord.createMime("text/plain", messageEncrypted.getBytes(Charset.forName("US-ASCII"))) Right now, I'm using Ntag213 doing the below code: nnect() I have an (university) project where I basically write and read text out of NFC Tags with Android devices in order to store one's balance in the card (wich can be used on the cafeteria, for example).