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A pair like Cyrillic ԁ (U+0501) and Latin d scores 0.781 mean SSIM across 18 fonts. That sounds moderate. But it is pixel-identical (SSIM 1.000) in eight of those fonts: Arial, Menlo, Cochin, Tahoma, Charter, Georgia, Baskerville, and Verdana. An attacker needs only one font to succeed. The exploitable risk is the max, not the mean.
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McKenzie will be based at BAS's headquarters in Cambridge for the remainder of the year, but he has previously overwintered in Antarctica. "When the winter comes, you feel this incredible sense of freedom as most people leave," he says.
Cuba's deputy foreign minister Carlos Fernández de Cossío said the US had shown a "willingness" to cooperate on "clarifying these regrettable events".