In practice, we do not usually sign a document by 'encrypting' (I'm using the word loosely, here) the entire document with our private key. Instead, we calculate a digest over the entire document, and then 'encrypt' the digest. Why? Select one: a. It prevents message recovery b. The digest also provides message integrity c. It is faster d. It avoids having to raise an incredibly large number (the entire document) to a massive power

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