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Digital signature is a cryptographic means through which the authenticity, data integrity and senders non-repudiation can be verified. Typically, digital signature of a document is a piece of information encrypted by the signer's secret key. Numerous researches have shown significant contributions to this field using various cryptographic primitives. However, there are many practical environments where digital signatures do not possess specific requirements, and thereby digital signatures appear in several other forms viz. proxy signatures, multi signatures, blind signatures, etc.
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