Jump to content
Nytro

Applied Crypto Hardening

Recommended Posts

Wolfgang Breyha, David Durvaux, Tobias Dussa, L. Aaron Kaplan, Florian Mendel, Christian Mock, Manuel Koschuch, Adi Kriegisch, Ulrich Pöschl, Ramin Sabet, Berg San, Ralf Schlatterbeck, Thomas Schreck, Alexander Würstlein, Aaron Zauner, Pepi Zawodsky

(University of Vienna, CERT.be, KIT-CERT, CERT.at, A-SIT/IAIK, coretec.at, FH Campus Wien, VRVis, MilCERT Austria, A-Trust, Runtux.com, Friedrich-Alexander University Erlangen-Nuremberg, azet.org, maclemon.at)

 

Abstract

 

Unfortunately, the computer security and cryptology communities have drifted apart over the last 25 years. Security people don’t always understand the available crypto tools, and crypto people don’t always understand the real-world problems.” — Ross Anderson in [And08]

 

This guide arose out of the need for system administrators to have an updated, solid, well researched and thought-through guide for configuring SSL, PGP, SSH and other cryptographic tools in the post-Snowden age. Triggered by the NSA leaks in the summer of 2013, many system administrators and IT security officers saw the need to strengthen their encryption settings. This guide is specifically written for these system administrators. As Schneier noted in [Sch13a], it seems that intelligence agencies and adversaries on the Internet are not breaking so much the mathematics of encryption per se, but rather use software and hardware weaknesses, subvert standardization processes, plant backdoors, rig random number generators and most of all exploit careless settings in server configurations and encryption systems to listen in on private communications. Worst of all, most communication on the internet is not encrypted at all by default (for SMTP, opportunistic TLS would be a solution). This guide can only address one aspect of securing our information systems: getting the crypto settings right to the best of the authors’ current knowledge. Other attacks, as the above mentioned, require different protection schemes which are not covered in this guide. This guide is not an introduction to cryptography. For background information on cryptography and cryptoanalysis we would like to refer the reader to the references in appendix B and C at the end of this document. The focus of this guide is merely to give current best practices for configuring complex cipher suites and related parameters in a copy & paste-able manner. The guide tries to stay as concise as is possible for such a complex topic as cryptography. Naturally, it can not be complete. There are many excellent guides [IS12, fSidIB13, ENI13] and best practice documents available when it comes to cryptography. However none of them focuses specifically on what an average system administrator needs for hardening his or her systems’ crypto settings. This guide tries to fill this gap.

 

Download: https://bettercrypto.org/static/applied-crypto-hardening.pdf

  • Upvote 1
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



×
×
  • Create New...