Security

High-assurance crypto software

Software bugs and timing leaks have destroyed the security of every Chromebook ECDSA "built-in security key" before June 2019, ECDSA keys from several popular crypto libraries, the Dilithium post-quantum software, the Falcon post-quantum software, and more. Will we ever have trustworthy implementations of the cryptographic tools at the heart of our security systems?
Standard testing and fuzzing catch many bugs, but they don't catch all bugs. Masochists try to formally prove that crypto software does its job. Sadists try to convince you to do your own proof work and to let them watch. After years of pain, a team of fifteen authors has now proudly announced a verified crypto library: fast but unportable implementations of a few cryptographic functions specifically for CPUs that aren't in your smartphone. This is progress, but the progress needs to accelerate. This talk will highlight a way to exploit the power of modern reverse-engineering tools to much more easily verify crypto software. This relies on the software being constant-time software, but we want constant-time software anyway so that we can guarantee security against timing attacks. Constant-time software is also surprisingly fast when cryptosystems are selected carefully. This talk is meant as an introduction for a general audience, giving self-contained answers to the following questions: What are timing attacks? What is constant-time software? What are some examples of constant-time crypto? How can we be sure that code is constant-time? What do these reverse-engineering tools do? How does constant-time code help these tools? How do we get from reverse engineering to guaranteeing correctness? The talk will be given as a joint presentation by Daniel J. Bernstein and Tanja Lange.

Additional information

Type lecture
Language English

More sessions

12/27/19
Security
Borg
Nowadays, Windows is still the most popular OS used in the world. It's very important for red teams / attackers to maintain the authority after they get into the OS by penetration test. So they need a vulnerability to hide in windows to escalate their account to system privilege.
12/27/19
Security
Hannes Mehnert
Dijkstra
Is the way we run services these days sustainable? The trusted computing base -- the lines of code where, if a flaw is discovered, jeopardizes the security and integrity of the entire service -- is enormous. Using orchestration systems that contain millions of lines of code, and that execute shell code, does not decrease this. This talk will present an alternative, minimalist approach to secure network services - relying on OCaml, a programming language that guarantees memory safety - composing ...
12/27/19
Security
littlelailo
Eliza
This talk is about running unsigned code at boot on iOS 11. I will demonstrate how you can start out with a daemon config file and end up with kernel code execution.
12/27/19
Security
Will Scott
Ada
It is easier to chat online securely today than it ever has been. Widespread adoption of signal, wire, and the private mode of WhatsApp have led a broader recognition of the importance of end-to-end encryption. There's still plenty of work to be done in finding new designs that balance privacy and usability in online communication.
12/27/19
Security
nba::yoh
Dijkstra
The 3DS is reaching end of life but has not revealed all its weaknesses yet. This talk will go through the process of reverse engineering an undocumented communication protocol and show how assessing hard-to-reach features yields dangerous results, including remote code execution exploits!
12/27/19
Security
Samuel Groß
Ada
So called “0-click” exploits, in which no user interaction is required to compromise a mobile device, have become a highly interesting topic for security researchers, and not just because Apple announced a one million dollar bug bounty for such exploits against the iPhone this year. This talk will go into the details of how a single memory corruption vulnerability in iMessage was remotely exploited to compromise an iPhone. The insights gained from the exploitation process will hopefully help ...
12/27/19
Security
Ada
Herzstück der digitalen Gesundheitsversorgung für 73 Millionen Versicherte ist die hochsichere, kritische Telematik-Infrastruktur mit bereits 115.000 angeschlossenen Arztpraxen. Nur berechtigte Teilnehmer haben über dieses geschlossene Netz Zugang zu unseren medizinischen Daten. Ein "Höchstmaß an Schutz" also, wie es das Gesundheitsministerium behauptet? Bewaffnet mit 10.000 Seiten Spezifikation und einem Faxgerät lassen wir Illusionen platzen und stellen fest: Technik allein ist auch ...