Biased RSA private keys: Origin attribution of GCD-factorable keys

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14330%2F20%3A00115914" target="_blank" >RIV/00216224:14330/20:00115914 - isvavai.cz</a>

Result on the web

<a href="https://link.springer.com/chapter/10.1007%2F978-3-030-59013-0_25" target="_blank" >https://link.springer.com/chapter/10.1007%2F978-3-030-59013-0_25</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/978-3-030-59013-0_25" target="_blank" >10.1007/978-3-030-59013-0_25</a>

Result language

angličtina

Original language name

Biased RSA private keys: Origin attribution of GCD-factorable keys

Original language description

In 2016, Švenda et al. (USENIX 2016, The Million-key Question) reported that the implementation choices in cryptographic libraries allow for qualified guessing about the origin of public RSA keys. We extend the technique to two new scenarios when not only public but also private keys are available for the origin attribution -- analysis of a source of GCD-factorable keys in IPv4-wide TLS scans and forensic investigation of an unknown source. We learn several representatives of the bias from the private keys to train a model on more than 150 million keys collected from 70 cryptographic libraries, hardware security modules and cryptographic smartcards. Our model not only doubles the number of distinguishable groups of libraries (compared to public keys from Švenda et al.) but also improves more than twice in accuracy w.r.t. random guessing when a single key is classified. For a forensic scenario where at least 10 keys from the same source are available, the correct origin library is correctly identified with average accuracy of 89% compared to 4% accuracy of a random guess. The technique was also used to identify libraries producing GCD-factorable TLS keys, showing that only three groups are the probable suspects.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10201 - Computer sciences, information science, bioinformathics (hardware development to be 2.2, social aspect to be 5.8)

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Computer Security – ESORICS 2020

ISBN

9783030590123

ISSN

0302-9743

e-ISSN

—

Number of pages

20

Pages from-to

505-524

Publisher name

Springer

Place of publication

Cham, Switzerland

Event location

Cham, Switzerland

Event date

Jan 1, 2020

Type of event by nationality

CST - Celostátní akce

UT code for WoS article

—