Abstract: MIBS is a block cipher used in the implementation of lightweight cryptographic equipment such as RFID tag,and there has been no published paper on its security at present This paper presented the MII3S algorithm and differential fault analysis principlc,proposcd a wick fault analysis method on MIBS,and verified it through simulation. Expcriment results demonstrate; due to its Feistel structure and S-box feature, MIBS is vulnerable to wide fault attack, after injecting 32-bit fault to the 32Th and 31h round left register, 64-bit MIBS master key search space can be reduced to 21. 70-bit, the full key can be recovered after 1 second brutcforccscarch, and the fault analysis method in this paper can provide some ideas on other block ciphers using S-box.

Key words: B1ock ciphcr,MIBS cipher,Feistel structure,Diffcrential fault analysis,Wide fault