RKD (Radio-Signal Key Distribution)

Piller, Ernst; Schölnast, Hubert

doi:10.1007/978-3-032-24764-3_4

Content of this chapter

Chapter 4 · RKD (Radio-Signal Key Distribution)

The RKD chapter presents radio-signal key distribution as a physical-layer method for generating shared cryptographic keys from wireless channel measurements. It explains how Alice and Bob measure reciprocal channel properties, most commonly signal strength or related RF characteristics, and use the similarity and randomness of these measurements to derive related bit sequences.

The chapter then follows the practical processing chain from measurement to usable key material. It discusses quantization, information reconciliation, error correction, privacy amplification, authentication needs, and attacker models. The analysis makes clear that RKD's physical basis does not eliminate the need for careful mathematical and protocol processing.

Operationally, the chapter treats RKD as inexpensive, compact, and attractive for mobile scenarios such as vehicles, drones, and local ad hoc links. It also identifies limits: short range, modest key rates, dependence on movement or channel variation, lack of mature standardization, and the absence of a broad infrastructure for distributing key material beyond two parties.

Explains reciprocal radio-channel measurements
Describes measurement, quantization, and reconciliation
Evaluates attacker assumptions and privacy amplification
Highlights mobile and low-cost deployment scenarios
Identifies range, key-rate, and standardization limits

Suggested citation

Reference in IEEE style

E. Piller and H. Schölnast, “RKD (Radio-Signal Key Distribution),” in Data Encryption at the Intersection of Mathematics and Physics: Comparing Physical Methods of Cryptography. Cham, Switzerland: Springer Cham, 2026, doi: 10.1007/978-3-032-24764-3_4.

Reference in ACM style

Ernst Piller and Hubert Schölnast. 2026. RKD (Radio-Signal Key Distribution). In Data Encryption at the Intersection of Mathematics and Physics: Comparing Physical Methods of Cryptography. Springer Cham, Cham, Switzerland. DOI: 10.1007/978-3-032-24764-3_4

BibTeX entry

@incollection{piller_schoelnast_2026_chapter_4_rkd,
  title     = {RKD (Radio-Signal Key Distribution)},
  author    = {Ernst Piller and Hubert Schölnast},
  booktitle = {Data Encryption at the Intersection of Mathematics and Physics: Comparing Physical Methods of Cryptography},
  publisher = {Springer Cham},
  series    = {SpringerBriefs in Information Security and Cryptography},
  year      = {2026},
  doi       = {10.1007/978-3-032-24764-3_4},
  url       = {https://link.springer.com/chapter/10.1007/978-3-032-24764-3_4},
  language  = {en}
}

RIS entry

TY  - CHAP
TI  - RKD (Radio-Signal Key Distribution)
T2  - Data Encryption at the Intersection of Mathematics and Physics: Comparing Physical Methods of Cryptography
AU  - Piller, Ernst
AU  - Schölnast, Hubert
PY  - 2026
PB  - Springer Cham
T3  - SpringerBriefs in Information Security and Cryptography
DO  - 10.1007/978-3-032-24764-3_4
UR  - https://link.springer.com/chapter/10.1007/978-3-032-24764-3_4
LA  - en
ER  -

CSL JSON entry

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