송원우, 김종성, 전용진, 서재원,

Vol. 34, No. 4, pp. 569-575, 8월. 2024
10.13089/JKIISC.2024.34.4.569, Full Text:
Keywords: cryptanalysis, Differential Attack, IoT, Lightweight cryptography
Abstract

The 64-bit block cipher IIoTBC is an encryption algorithm designed for the security of industrial IoT devices and uses an 128-bit secret key. The IIoTBC’s encryption algorithm varies depending on whether the MCU size used in IoT is 8-bit or 16-bit. This paper deals with a differential attack on IIoTBC when the MCU size is 8-bit. It attacks 15-round out of the entire 32-round using IIoTBC's 14-round differential characteristic. At this time, the number of required plaintexts and encryption are and , respectively. The differential characteristic presented in this paper has a longer round than the existing 13-round impossible differential characteristic, and the attack using this is the result of the first key recovery attack on IIoTBC.

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