[android-developers] Re: Google Nexus S - Secure storage

Another idea I have, is to use a RFID card/tag compatible with Nexus S
which contains such a secure element and has some sort of Challenge-
response scheme. Is the tag reader always active, or is it only active
when a app "requests" it active?

Then I could just put the secure tag behind the battery cover, and
since the tag reader has anticollision, the tag reader could handle
both the extra tag and any external tag.

Any ideas of "secure" tags (It should support encryption onboard, if
it symmetric or asymmetric or keyed HMAC does not matter) that is
compatible with the Nexus S RFID reader?. The key loaded into token
should not be retrieveable.

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