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"Digital chop" is closer to the truth than "digital signature", but
still not fully analogous. Good chops are hand-carved. This gives
them a property private keys lack -- they are difficult to copy,
even if the owner wants to. A verifier will see that the original
chop-mark and the chop-mark made by the copy have subtle differences.
- From: Carl Ellison <cme@Cybercash.COM>