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A Polynomial-Time Key-Recovery Attack on MQQ Cryptosystems

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Figure

Fig. 1.ThequadraticformQ(s)ofqs. Gray parts denote arbitrary values,whereas white parts denote systematic ze-ros.
Fig. 3. Unique transformation Ω to obtain the good key S′.
Table 2. Theoretical complexities, in terms of field op-erations, of the key recovery attack on MQQ-SIG com-pared to the claimed security level.

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