Is it good choice to use public key for digital signature?

Is it good choice to use public key for digital signature?

Public key encryption is quite slow. To address this, messages are hashed and then encrypted with the private key, as opposed to encrypting the entire message to create the digital signature. Any potential tampering of the online document would result in a different hash value than the original document’s hash value.

Can you sign a file with a public key?

It’s important to know that anybody can sign a file, but they can only sign it with their own private key. You can’t sign a file with somebody else’s private key unless you somehow manage to get hold of the private key, for example by hacking their computer.

How can public key encryption be used as a digital signature?

Digital signatures work through public key cryptography’s two mutually authenticating cryptographic keys. The individual who creates the digital signature uses a private key to encrypt signature-related data, while the only way to decrypt that data is with the signer’s public key.

How does the receiver decrypt a digital signature?

Receiver decrypts the digital signature using the public key of sender. (This assures authenticity,as only sender has his private key so only sender can encrypt using his private key which can thus be decrypted by sender’s public key). The receiver now has the message digest.

Do you need a private key to create a digital signature?

I always thought that in order to create a digital signature, you must use your private key and then the receiver uses the sender’s public key to verify it.

How does a public key verify a signature?

There are a few different ways to verify that a message came from some expected sender. For example: Decrypts the signature (2) with the public key to obtain a message, supposedly the same message as (1) but we don’t know yet. We now have two messages that we need to verify are identical.

How is a digital signature transmitted with a message?

Digital signature is then transmitted with the message. (message + digital signature is transmitted) Receiver decrypts the digital signature using the public key of sender. (This assures authenticity,as only sender has his private key so only sender can encrypt using his private key which can thus be decrypted by sender’s public key).