著者

KIM ChangKyun JUNG Eun-Gu LEE Dong Hoon JUNG Chang-Ho HAN Daewan

出版者

一般社団法人 電子情報通信学会

雑誌

IEICE transactions on fundamentals of electronics, communications and computer sciences (ISSN:09168508)

巻号頁・発行日

vol.96, no.1, pp.35-41, 2013-01-01

参考文献数

13

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The cryptographic algorithm called INCrypt32 is a MAC algorithm to authenticate participants, RFID cards and readers, in HID Global's iCLASS systems. HID's iCLASS cards are widely used contactless smart cards for physical access control. Although INCrypt32 is a heart of the security of HID's iCLASS systems, its security has not been evaluated yet since the specification has not been open to public. In this paper, we reveal the specification of INCrypt32 by reverse-engineering iCLASS cards and investigate the security of INCrypt32 with respect to the cryptographic sense. This result is the first work to describe the details of INCrypt32 and the possibility of a secret key (64-bit) recovery in our attack environments. 2⁴² MAC queries are required in the real environment using secure communication protocols. But the required number of MAC queries decreases to 2¹⁸ if MAC quires for chosen messages with arbitrary length can be requested.