How does a digital signature works?


The digital signature is a digital method of ensuring the correctness of the identity of people by saving time and cost to a great extent. The digital signature method uses public-key cryptography. This method is also known as asymmetric cryptography. Using the public key encryption algorithm, one can generate two keys which are known as the public key and private key. The digital signature works with the help of these two mutually authenticated keys. Here the person who is creating the digital signature uses the private key to encrypt the document which is to be signed and this document can only be decrypted using the public key of the signer. This way is used to do the authentication of digital signatures. The digital signature method makes all the parties believe that the created digital signature by the individual is kept secret and does not make the fraudulent mechanisms by the private key holder.
A one-way hash of digital data to be signed is generated when one tries to generate a digital signature. A private key is used to encrypt this hash. This encrypted hash and other information’s will form a digital signature. Rather than encrypting the document or message to be signed, the encryption of this hash function can map an arbitrary input to a fixed output. This will save time than that of signing. The hash data will contains a unique hash value. A single alteration in a character will result in a different value. A digital signature can be used with either encrypted or unencrypted data.

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