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In a blind signature scheme, the signer does not know what he is signing. This is an important building block of anonymous voting or digital cash schemes, because it allows an authority to control the creating of signed messages, but doesn't allow it to track their use.
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Usability of padding scheme in blinded RSA signature?
In Wikipedia's article on Blind signature, in the section Dangers of blind signing which describes RSA blinding attack one reads the following
This attack works because in this blind signature sch …