Digital signatures require extensive safekeeping. Unlike passwords, you can't store them in your head. The number sequence is too long. You have to store the signature on a smart card, keep it on your hard drive, or carry it around on a disk. Since the signature depends upon non-repudiation as the key selling point, you better not let anyone else get his or her hands on it. Figuring ways to protect your digital signature from your teenager, your estranged spouse, a crazy love interest, or a housekeeper may be a challenge.
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