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Abstract

From the book: Data Encryption at the Intersection of Mathematics and Physics – Comparing Physical Methods of Cryptography

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Abstract

The abstract frames the book as a decision aid for high-security telecommunications and data storage. Rather than ranking technologies, it compares QKD, RKD, and MKD across a common set of practical criteria, including key rate, distance, attenuation, robustness, cost, infrastructure, standardization, and operational risk. The text emphasizes that physical cryptography becomes relevant when decision-makers are unwilling to rely solely on mathematical hardness assumptions.

QKD is described as physically grounded in quantum mechanics but constrained by attenuation, short link lengths, trusted-node dependencies, high cost, and weak suitability for mobile use. RKD is presented as inexpensive, mobile-friendly, and technically simple, but limited by low key rates, short distances, and missing multi-party infrastructure. MKD is characterized as organizationally demanding but uniquely capable of transporting massive amounts of key material, making continuous one-time-pad use realistic.

  • Compares QKD, RKD, and MKD in one criteria grid
  • Focuses on procurement and architecture decisions
  • Distinguishes security benefits from new attack surfaces
  • Highlights side channels, integration risks, and logistics
  • Identifies MKD as the only realistic route to large-scale OTP use

Suggested citation

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@incollection{piller_schoelnast_physcrypto_ch1,
  title     = {Introduction},
  author    = {Piller, Ernst and Sch\"olnast, Hubert},
  booktitle = {Data Encryption at the Intersection of Mathematics and Physics},
  publisher = {Springer},
  year      = {2026},
  note      = {Open Access}
}