A digital signature is a type of electronic signature where a mathematical algorithm is routinely used to validate the authenticity and integrity of a message (e.g., an email, a credit card transaction, or a digital document). the digital signature algorithm, analyzes the security of the scheme, provides a proof of security under EUF-CMA, and discusses the practical results from implementations on several constrained devices. Technically speaking, a digital signature is the encrypted hash (digest, checksum) of a message.That means we generate a hash from a message and encrypt it with a private key according to a chosen algorithm. However, the RSA algorithm used most often for digital signatures is invulnerable even to a "chosen plain-text attack" when proper padding is used (like OAEP). 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