It is more flexible, both in communication options and data storage configuration. I have such DESfire tags, with and without ferrite, that work fine with an Android phone.įor ease of development, my preference is with DESFire. They will both perform OK on a ferrite layer and an antenna size of 35mm sounds OK. They both support the same reading speeds (check the specs!). In addition, MIFARE Plus has a proximity check feature, while DESFire has no such thing. While MIFARE Plus aims to improve the security of MIFARE Classic, but its functionality is for the rest very similar to it. Each application and file can be configured with its own access control keys. DESFire offers AES and 3DES for maximum flexibility, with encrypted, MACed or plain communication: your choice. The 2 products strive for somewhat different security goals, I would say. It can be configured as an NFC Forum Type 4 Tag, so that compliant systems (such as Android devices with NFC) will automatically read out the NDEF message. It is ISO 14443-4 compliant and it can communicate in an ISO 7816-4 compliant mode. MIFARE DESFire has a flexible memory structure: up to 28 'applications' (a kind op directories) with up to 32 files each. It has the same fixed memory structure as MIFARE Classic: sectors with 3 blocks of 16 bytes of data and a block for the 2 access control keys. It has a mode which is backward compatible with MIAFRE CLassic. MIFARE Plus is really meant as an upgrade for existing MIFARE Classic-based systems.
From an android POV, which is better? For ease of development and for more functionality which is more appropriate? - The command sets are similar, with the DESFire having an extra set of commands and the capability to run more applications, so based on your comment regarding functionality the DESFire offers more options.
The tags are going to be interacting with an nfc reader which is plugged in to an Android device.The size of the nfc tag stickers are going to be 35mm diameter, does it make a difference what is the tag that is used? - Form factor looks identical, so no.In the future if we want to get into payments, what is preferred? - the DESFire has greater security functionality, so I would recommend it over the Plus.They both cope with it, but I'd recommend glue as it is a better physical solution to prevent accidental loss. When stuck with a ferrite layer so that it can be stuck on a phone, which is better? - not really a question.Speed of Readability - They both can handle 848 kbit/sec.Security - the DESFire has greater security functionality, gaining Common Criteria EAL 4+.
You seem to have an awful lot of questions here, some of which may not actually be relevant, but here goes:
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