The RSA PKCS #1 v2.1 standard includes a signature scheme thatcan be viewed as a variant of the RSA-FDH scheme that we saw inclass. In the construction, it is critical for the range of thehash function H to be (close to) all of Z ∗ N ; in particular, itdoes not suffice to simply let H be an “off-the-shelf”cryptographic hash function such as SHA-1. Describe RSA PKCS #1v2.1, and how the hash function is used in the standard.
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