Digital Signature

What is Digital Signature? Why are They Considered Secure?

In a world full of technology with no use of paper and pen for signing a document such as contracts, agreements, etc. just a digital signature is required to do so. With no physical presence of the individual to sign the documents, only your digital signature will help too. The world is going paperless with extreme use of online transactions so we require more flexible and approachable resolves such as a digital signature. A digital signature is now claimed to be as alike as the handwritten signature and also backs the loyalty with the information passed online among two entities.

In western countries, a digital signature is valid and accepted from long before, as compared to the signature written with ink. Let’s understand the meaning of digital signature perfectly.

Digital Signature

Digital Signature?

It is an arrangement for mentioning the legitimacy of the specific document or an agreement. To identify the individual for securing the data in digital document digital fingerprints can be of help. It surpasses the validity and authenticity for the document that is digitally signed and compliance with legal regulation for authentication of the signer’s identity along with the digital document.

As said earlier they are equivalent to handwritten ink, they provide proof of the realness, individuality, and standing of the digital document and also states that the data is not tampered with by the individual during the transfer. A digital signature is claimed to be more substantial and safer as houses as compared to other kinds of digital signatures. Also, an email becomes a part of the digital signature wholly. 

They are cast-off in e-commerce for website security, in the distribution of software, while making a financial transaction, transferring a confidential document, and for several other conditions for preventing the document from forgery and tampering techniques. Also, it brings transparency between the two entities while making an online financial transaction to avoid getting bit by phishing techniques. A digital signature is also called an electronic signature. 

Why are they considered secure?

A cryptographic algorithm is a source for creating the key pair system, public and private key. These digital signatures are backed with public-key cryptography. The key provided by the cryptographic algorithm works in this way, the private key is given to the signer and is required for encoding the document whereas the public key is given to the receiver and required to decode the document in its original form.

Both the entities must have a registered digital certificate from the authority of issuing certificates to get in contact and connecting their signatures. Cryptographic public keys are accurate, have more accuracy, well secured, and maintains the authenticity of the digital document.  

The word authentication means the information inside the document sent by the sender is genuine or has not been altered while transmitting.

The cryptographic algorithm provides a diverse exclusive identity for every individual from a trusted facility provider. Only when the signer has signed the document his identity will be verified and the document is encoded with the help of public key infrastructure technology. 

Encryption of digitally signed documents

As encryption is the part where you gather the content and put it in a box locked with a password so that only the assured person can read it. encryption are two types viz. 

Symmetric encryption

It is a process of a digitally signed document that is safeguarded with a help of specific that known by the sender and the receiver only. the document is encoded with a key by the sender and then that key is sent to the receiver to decode the document. You might face some issues while transferring the key but make sure the transfer of the key is done securely.

Asymmetric encryption

It involves two keys that encrypt and decrypt the document and its alternative name is public-key encryption. The public is the known to everyone key and the private key is known to the sender or the creator. In this the process is reversed, the receiver will develop two keys and sends the public key to the sender. After sharing the key, the sender encodes the document and transfers it digitally to the receiver back.

Then the document is decoded by the receiver with the private key. This shows the veracity of the document. Also, the sender is not tied with the document as he has the public that is known to everyone. To create the ownership of the message here’s where digital signature comes up.

How does Digital signature work?

  • Firstly, it is a mathematical algorithm that will develop two separate keys viz. one will be the private key and second will be the public key.
  • Then the sender will sign the document and a cryptographic hash will get generated for the document.
  • To decode the hash, there is a private key with the sender that is kept in a well-secured safe in the HSM box. 
  • The private and the public key is attached with the document that is transferred to the receiver.
  • The receiver will decode the hash with the public key. 
  • Two cryptographic hash is generated to monitor their accuracy and to be sure if the document is not forged, check if both the hash key matches or not if they match, they are not forged.

Types of Digital Signature

As the study says there are three types:

  1. The class 1 type of digital signature has no specific features, with less amount of security or for the security of document transmission. It can verify the username of the individual.
  2. The class 1 type of digital signature has no specific features, with less amount of security or for the security of document transmission. It can verify the username of the individual.
  3. The class 1 type of digital signature has no specific features, with less amount of security or for the security of document transmission. It can verify the username of the individual.


  • The authenticity of the digital signature has good accuracy, it helps the receiver to be sure that the sender is a known person, and the sender holds a secret key to develop a digital signature and also validates that the document was transmitted by the sender.
  • If the sender declines the claim of the responsibility of sending the message, then in such case the receiver can use the digital signature as proof to showcase the origin of the message.
  • The integrity of the digital signature is shown by the cryptographic has generated by the senders’ digital signature. The document has not been altered, only if the cryptographic hash key matches.

A little brief about the PKI services 

First of all, PKI means public key infrastructure, it is a tool for distribution and verification for the public key that enables user and computer system to transmit data with high-level security through the internet and validates the identity of the transmitting entity. There is an arrangement where you can transfer confidential information with PKI but with no security assurance of the other party.

PKI is the assistant of the SSL certificate and TLS certificate. It also encodes the server communication and is helpful for HTTPS or padlock on the side of the browser address. PKI is a great cybersecurity tool to solve problems in the organization’s security suite. 

PKI is also grateful for 

  • Multifactor authentication and access control
  • Files compliant, trusted Digital signature
  • Encodes email communication and true verification of senders’ identity
  • Digital signature and protects the code
  • Builds identity and trust in the IoT ecosystem

The benefit of the digital signature is getting the highest level of security for paperless, online financial transactions, lower cost and effort at the same time, increase productivity and efficiency, remote access, and convenient way for highly secured electronic transactions to transfer it through the internet. It can also adopt the common citizen, projects undertaken, and government for entrepreneurial or other legalities.

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