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This paper presents an implementation of a cross layer approach to preserve privacy in the “Internet of Things” based on RFID and especially ISO/IEC 15693 standard, preventing from threats like eavesdropping, skimming or tracking of tags. We merge a solution at physical layer with a noisy reader which secures the communication from tag to reader, with a simple challenge-response protocol implemented with a lightweight symmetric block cipher PRESENT requiring only 1570 gates. The use of unique identifier has been safeguarded to ensure backward compatibility and a simple ownership transfer giving back to the user a full control on his tags. Backward and forward privacy are always preserved whereas after sale services and electronic warranties remain possible.