Have you ever wondered how we can be sure that a signed document is not forged? Most people today do not put too much effort into considering the matter, but banks and companies in general do care. They use digital signatures to ensure that their financial transactions are safe. A digital signature is an electronic analogue of our traditional handwritten signature. However, to make it work, an encryption algorithm is used. As a result, money is kept safe, and no one can mess with transaction documents.