What algorithm is used for digital signature?

What are the three digital signature standard algorithms?

When I was in school, we used to create digital signatures for letters and documents.

You know, with a printer. What are the three standard algorithms of digital signature standard?
I don't know what these algorithms are, I have only heard the names of these algorithms, but couldn't remember how they worked. A common approach to this is to generate a random number, then encrypt it, then send it with the document and then sign that random number. That way you never need to keep record of the random numbers generated or store them, and by using a public key to encrypt you use a unique random number for each recipient. If you use a single key to encrypt your entire message that would not be unique to each recipient, it would become easier to discover the information that has been encrypted with that key.

So, if you have Alice, Bob, Carol and Dave. If you really want to learn about this type of encryption check out public-key cryptography, which uses the method described above, and comes up with lots of other ways of creating and validating keys, generating keys from an input message, signing messages, and proving the authenticity of messages.

What is the mathematical algorithm for digital signature?

I am a software developer with an academic background in mathematics, but not an expert in this area.

I understand that the digital signature is based on cryptography which is a topic I am unfamiliar with. I am now building an application which requires a user to enter his/her signature and then digitally sign the data. I need to know what the mathematical algorithm for digital signature is. I found that there is no standard for digital signature. Can anyone please tell me what the digital signature is based on and how the algorithm works?

I'm a mathematician and I've never heard of such a thing as a "digital signature." I guess it's a way of verifying the identity of a party to a transaction.

Tad JonesMar 14 '11 at 1:55. I think I understand now. There are two main types of digital signatures, secret key and public key. The digital signature is used to verify the identity of a party to a transaction. The process involves generating a public and private key, signing the transaction with the private key, and verifying the signature with the public key.

E. L. JohnsonMar 14 '11 at 2:21

@todd-jones, yes, I am familiar with RSA and DSI thought a digital signature is just a signature on an electronic document. I didn't know that there are different types of signatures. I am studying more about it now.

Shayam ShrivastavaMar 14 '11 at 2:31. Yes, digital signature is one way of doing it. Todd-jonesMar 14 '11 at 2:39. There are different methods of signing a document. This wikipedia article gives a brief overview:
Shayam ShrivastavaMar 14 '11 at 2:44. The signature on a document can be signed using various techniques, for example the document can be sent to you and signed by you, or a company can send you a copy of the document and you sign it on their behalf, or the document can be stored on your computer and signed when you start it up again. In any case, once the document is signed, it can be authenticated (by others) as the genuine product of the entity who signed it.

What algorithm is used for digital signature?

If a company decides to sell something and needs digital signature, which certificate should I get?

You get your own keypair with ECIES. You will then generate the certificate signing request (CSR) on your web-server. The cert-issuer gets a .pem file from the public key from the root CA, and converts it into .cer format. They then add their .pem in the CSR as an additional cert along with the others for validation.

I am not sure what the process is if it comes from some external source. I'd have to give this a more thorough answer, but this should give you the basics.