Loading…
44CON 2017 has ended
Friday, September 15 • 09:30 - 11:29
Kev Sheldrake - Cracking HiTag2 Crypto - Detailed Look at the Academic Attacks.

Sign up or log in to save this to your schedule and see who's attending!

NOTE: The corresponding talk “Cracking HiTag2 Crypto – Weaponising Academic Attacks for Breaking and Entering” is a pre-requisite for this workshop. You must attend the talk if you plan to attend the workshop.

HiTag2 is an RFID technology operating at 125KHz. It is distinguished from many others in the same field by its use of 2-way communications for authentication and its use of encryption to protect the data transmissions – the majority of RFID technologies at 125KHz feature no authentication or encryption at all. As a result it has been widely used to provide secure building access and has also been used as the technology that implements car immobilisers.

In 2012, academic researchers Roel Verdult, Flavio D. Garcia and Josep Balasch published the seminal paper, ‘Gone in 360 Seconds: Hijacking with Hitag2’ that presented three attacks on the encryption system used in HiTag2. They implemented their attacks on the Proxmark 3 device (an RFID research and hacking tool) and gave several high-profile demonstrations, but didn’t release any of their code or tools. Since then, the forums supporting Proxmark 3 and RFIDler (another RFID hacking tool) have received many requests for implementations of these attacks, but so far none have been forthcoming.

In this workshop I will explain how HiTag2 RFID works in detail, including the PRNG and the authentication and encryption protocols, and will present my own implementations of the attacks, written for RFIDler and supported by desktop computers. The first attack uses a nonce replay to misuse the integrity protection of the comms in order to allow access to the readable RFID tag pages without needing to know the key. The second and third attacks use time/memory trade-off brute force and cryptanalytic attacks to recover the key, such that the contents of the read-protected pages can also be accessed. The attacks are weaponised and permit cloning of tags, which I will demonstrate.

All tools will be publicly released.

Speakers

Friday September 15, 2017 09:30 - 11:29
*Workshop*

Attendees (7)