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1-liner (clear version in 3rd party) solution in Creative category for Rotating Grille Cipher by Phil15
grille_encrypt=lambda t,g,N=__import__('numpy'),I=__import__('itertools'):None if(sum(r:=[N.rot90(m,-k)for m in [N.array([[c=="X"for c in r]for r in g])]for k in range(4)])!=1).any()else"".join(s for p in[[i for m in r for i in I.compress(range(16), m.flat)]]for x in zip(*[iter(t)]*16)for _,s in sorted(zip(p,x)))
Dec. 16, 2021
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