Physicists once thought it was impossible to learn what was inside black holes because that stuff is essentially cut off from the rest of the universe. Radiation, though, does seep out of black holes, and that radiation carries information about the interior.
A new sttudy of how to secure information using quantam principles to encrypt keys that controls access to information also suggests it's at least theoretically possible to use the mathematics of quantam physics and information theory to probe the interiors of black holes.
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