Part of the reason why this thing hasn't been solved yet is because the guy who created the Kryptos sculpture, as it's called, is an artist—not a cryptographer by trade.Imagine walking past a 12-foot-tall scroll covered in seemingly nonsensical letters every day for 30 years and wonder...
"Kryptos is a sculpture located on the grounds of CIA Headquarters in Langley, Virginia. Installed in 1990, its thousands of characters contain encrypted messages, of which three have been solved (so far). There is still a fourth section at the bottom consisting of 97 or 98 characters which ...
But running BKZ-20 on such a high dimension is going to be very expensive, so it might be a better choice to switch to LLL and increase d to, say, 600, in which case we have 1.021l+dql/(l+d)≈2129.22, which is tight, but within range of being solved. The following graph plots...