A recent paper by Coggia and Couvreur presents a polynomial time key-recovery attack on Loidreau’s encryption scheme, based on rank-metric codes, for some parameters. Their attack was formulated for the particular case when the secret matrix in Loidreau’s scheme is restricted to a 2-dimensional subspace. We present an extension of the Coggia–Couvreur attack to deal with secret matrices chosen over subspaces of dimension greater than 2.

中文翻译：

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扩展对 Loidreau 等级度量密码系统的 Coggia-Couvreur 攻击

Coggia 和 Couvreur 最近的一篇论文提出了对 Loidreau 加密方案的多项式时间密钥恢复攻击，基于等级度量代码，针对某些参数。他们的攻击是针对特定情况制定的，当 Loidreau 方案中的秘密矩阵仅限于二维子空间时。我们提出了 Coggia-Couvreur 攻击的扩展，以处理在维度大于 2 的子空间上选择的秘密矩阵。