| 摘要 |
The invention relates to a method for arranging an encrypted NFC connection. Two NFC devices (A, B) each exchange a signal of the same frequency having a random phase (ϕA, ϕB), this signal being registered at the other of the devices (B, A) as a reception signal with a frequency-specific and distance-dependent phase rotation (ϕC), the phase of the devices' own transmission signal being added to said reception signal in order to obtain a phase total (<u>θ</u> A=ϕA+<u>ϕ</u> B+ϕC, <u>θ</u> B= <u>ϕ</u> A +ϕB+ϕC). The phase total produced in this manner is quantised in the signal space, in L of the same type levels, and the signal is coded in symbols represented by bit sequences. The suggested method does not require channel entropy and is secured from eavesdropping in a spatial section determined by the frequencies used. |
