Digital Signature – What Is It & How Does It Work?
An Insight Into Digital Signatures & the Way It Works
What’s a Digital Signature?
How Digital Signature Works?
- First, Alice decides and selects the file she wants to sign, or in her email application, she’ll click on the sign option.
- Once the file is selected, Alice’s computer will calculate the hash value of the file content or the message that has to be sent to Bob.
- Next, the hash value of the selected file or message gets encrypted using Alice’s Private Key for creating the Digital Signature.
- After it’s signed using Private Key, that original file or an email message will be sent to Bob along with the Digital Signature.
- When Bob receives that signed message – the document or an email message, the associated application will identify that the received file is signed, then Bob’s computer will take other steps:
- Decrypt that Digital Signature, which was attached using Alice’s Public Key.
- Calculate the hash of that message.
- Compare computed hash value from the received message with the decrypted hash value of Alice’s message.
- If any difference is found, it’ll consider that the received message is not original, and it has been tampered with.
How to Create a Digital Signature
On the other hand, if you want your documents to verify the authenticity of your digital certificate without anyone’s intervention automatically, then you’ve to purchase a digital certificate offered by globally known and reputed certificate authorities. Once you download and install your certificate – you will be ready to Sign and Encrypt documents or mails digitally.
Lastly, it’ll be a sensible decision to get a digital certificate from the certificate authority, if you’re an organization whose document must be seen as coming from a trustworthy source for assuring users that they’re safe.
Other Ways to Use Digital Signatures
- SSL/TLS Certificate – When it comes to websites, public key, along with a digital signature offered by a certificate authority, is used for establishing a secured connection between the client and the webserver.
- Document Signing Certificate – Often, it happens that it has to be proved that a document that you’re about to open forms a trusted source, and it hasn’t been tampered with. For instance, a legal matter where it has to be proved that the contract hasn’t been altered.
- Code Signing Certificate – If you’re a software developer, then you might know the importance of a code signing certificate. It uses a digital signature to assure customers that software or any other executable file they’re downloading hasn’t been tampered with, and it’s signed using a trusted certificate.
Types of Digital Signatures
- Adobe supports – Certified Signature and Approval Signature.
- Microsoft Word supports – Visible signature and Non-Visible Signature.
Approval signatures are usually used for signing an organization document where you want to optimize the organization’s approval process. The procedure for this simple captures your approval along with other individuals and embeds them within your PDF document.
Visible Digital Signatures
Invisible Digital Signatures
Many security products are available in the market, along with the most important digital signature offered along with CAs certificate, which is something that shouldn’t be overlooked. By attaching digital signature, you’ll be able to provide trust and assurance to users that have needed before downloading anything.
- Digital Signature vs. Electronic Signature – Learn the Difference
- Difference Between Digital Signature and Digital Certificate
- Public Key Encryption – What Is It & How SSL/TLS Certificate Uses to Provide Secure Connection
- Guide to SSL Offloading – What Is It? How It Works & Benefits It Offers
- The SSL/TLS Handshake – Know the Process