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Science. 2002 Sep 20;297(5589):2026-30.

Physical one-way functions.

Author information

1
Center for Bits and Atoms, The MIT Media Labs, 20 Ames Street, Cambridge, MA 02139, USA. ravi@thingmagic.com

Abstract

Modern cryptographic practice rests on the use of one-way functions, which are easy to evaluate but difficult to invert. Unfortunately, commonly used one-way functions are either based on unproven conjectures or have known vulnerabilities. We show that instead of relying on number theory, the mesoscopic physics of coherent transport through a disordered medium can be used to allocate and authenticate unique identifiers by physically reducing the medium's microstructure to a fixed-length string of binary digits. These physical one-way functions are inexpensive to fabricate, prohibitively difficult to duplicate, admit no compact mathematical representation, and are intrinsically tamper-resistant. We provide an authentication protocol based on the enormous address space that is a principal characteristic of physical one-way functions.

PMID:
12242435
DOI:
10.1126/science.1074376
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