“The methodology consisted of using a hypodermic needle to carefully inject tiny quantities of what the researchers will only refer to as a ‘non-polar solvent’ between the holographic security sticker and the brass coin itself. After the solvent weakened or entirely dissolved the adhesive they were able to peel back the holographic foil and access the private key beneath. The sticker was then trivially replaced, though Stits felt that using a secondary adhesive might be necessary since little of the original adhesive was left. The re-assembled coin bore only a tiny mark at the edge of the foil where the needle was first inserted.”

http://codinginmysleep.com/casascius-physical-bitcoins-cracked-at-defcon/

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