License: Creative Commons Attribution 3.0 Unported license (CC BY 3.0)
When quoting this document, please refer to the following
DOI: 10.4230/LIPIcs.ECOOP.2018.10
URN: urn:nbn:de:0030-drops-92151
Go to the corresponding LIPIcs Volume Portal

Krüger, Stefan ; Späth, Johannes ; Ali, Karim ; Bodden, Eric ; Mezini, Mira

CrySL: An Extensible Approach to Validating the Correct Usage of Cryptographic APIs

LIPIcs-ECOOP-2018-10.pdf (0.6 MB)


Various studies have empirically shown that the majority of Java and Android apps misuse cryptographic libraries, causing devastating breaches of data security. It is crucial to detect such misuses early in the development process. To detect cryptography misuses, one must first define secure uses, a process mastered primarily by cryptography experts, and not by developers.
In this paper, we present CrySL, a definition language for bridging the cognitive gap between cryptography experts and developers. CrySL enables cryptography experts to specify the secure usage of the cryptographic libraries that they provide. We have implemented a compiler that translates such CrySL specification into a context-sensitive and flow-sensitive demand-driven static analysis. The analysis then helps developers by automatically checking a given Java or Android app for compliance with the CrySL-encoded rules.
We have designed an extensive CrySL rule set for the Java Cryptography Architecture (JCA), and empirically evaluated it by analyzing 10,000 current Android apps. Our results show that misuse of cryptographic APIs is still widespread, with 95% of apps containing at least one misuse. Our easily extensible CrySL rule set covers more violations than previous special-purpose tools with hard-coded rules, with our tooling offering a more precise analysis.

BibTeX - Entry

  author =	{Stefan Kr{\"u}ger and Johannes Sp{\"a}th and Karim Ali and Eric Bodden and Mira Mezini},
  title =	{{CrySL: An Extensible Approach to Validating the Correct Usage of Cryptographic APIs}},
  booktitle =	{32nd European Conference on Object-Oriented Programming  (ECOOP 2018)},
  pages =	{10:1--10:27},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-079-8},
  ISSN =	{1868-8969},
  year =	{2018},
  volume =	{109},
  editor =	{Todd Millstein},
  publisher =	{Schloss Dagstuhl--Leibniz-Zentrum fuer Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{},
  URN =		{urn:nbn:de:0030-drops-92151},
  doi =		{10.4230/LIPIcs.ECOOP.2018.10},
  annote =	{Keywords: cryptography, domain-specific language, static analysis}

Keywords: cryptography, domain-specific language, static analysis
Collection: 32nd European Conference on Object-Oriented Programming (ECOOP 2018)
Issue Date: 2018
Date of publication: 10.07.2018
Supplementary Material: ECOOP Artifact Evaluation approved artifact available at

DROPS-Home | Fulltext Search | Imprint | Privacy Published by LZI