Encryption-Based Secure JTAG

Emanuele Valea (1) , Mathieu da Silva (1) , Marie-Lise Flottes (1) , Giorgio Di Natale (2) , Bruno Rouzeyre (1)

1 TEST - Test and dEpendability of microelectronic integrated SysTems
2 TIMA - Techniques de l'Informatique et de la Microélectronique pour l'Architecture des systèmes intégrés

Standard test infrastructures, such as IEEE Std. 1149.1 (JTAG), IEEE Std. 1500 and IEEE Std. 1687 (IJTAG), are widely used in nowadays Integrated Circuits (ICs). However, they pose an important security challenge to the designers because of the high controllability and observability they offer through the Test Access Port (TAP). For instance, malicious users can exploit test infrastructures in order to access the internal scan chains of crypto-cores and perform scan attacks. Moreover, these infrastructures connect all the devices of the system to the same network. For this reason, the data sent to a target device are potentially visible to all the others. Consequently, this poses a threat to the confidentiality of data content. The encryption of test data is a countermeasure that has been conceived in order to overcome these threats. In this paper, we propose a new secure version of the JTAG infrastructure, relying on stream-based encryption.

Mots clés: Stream Cipher; Scan Encryption; Test and Security; JTAG

Domaines: Cryptographie et sécurité [cs.CR]; Architectures Matérielles [cs.AR]

Emanuele Valea, Mathieu da Silva, Marie-Lise Flottes, Giorgio Di Natale, Bruno Rouzeyre. Encryption-Based Secure JTAG. DDECS 2019 - 22nd International Symposium on Design and Diagnostics of Electronic Circuits and Systems, Apr 2019, Cluj-Napoca, Romania. pp.1-6, ⟨10.1109/DDECS.2019.8724654⟩. ⟨hal-02149061⟩