We might have never heard about the digital signature in those days but now today the world has transformed into a digital world. We use signatures in various places.  The purpose of our signatures is that our identity should be identified. A signature also states the validation of the document.  Signatures in those days were only done on papers but now the world has changed. Digital signatures are also a part of our world. Many of the tasks related to business, office, administration, Education are executed on an online platform. The year 2020 has taught us to use online platforms so well and it was also a need of hours.  Many of the documents or orders or directions are not valid unless the documents are not signed by the respective authorities.  Hence while sending or receiving the soft copies of documents we should verify that the document is been signed by the authority only then the document will be a valid document. And therefore was a need for a digital signature. 

What is a digital signature? 

When we work online the authentication of our work is necessary.  To verify and take responsibility for any paper signatures has to be done. We cannot use a real pen to sign a digital document that is inside your computer screen but what we can use is a digital signature. The digital signature clarifies the validation of the document and by whom and for whom it is sent can also be verified through digital signatures.  I would say that we use digital signatures on daily basis. Every one of us is using a computer or some digital or social media platform. They use their password or email id to log in to their accounts. This login id is also a kind of signatures which allows authorized person to log in to their accounts and it also keeps your account secured and safe.

A digital signature is a kind of proof that it is coming from a verified person or organization. These digital signatures are commonly used for software distribution and financial transaction, and other cases where it is important to detect forgery and tempering. 

Another simple example is the checksum. Suppose a file is sent to a friend and it doesn’t get received by the receiver due to some problem. You will understand that there is some problem with the file. The checksum also helps to recognize the apk or exc files if they are modified by the hacker or it is an original one. Other examples are public-key encryption and private key encryption. These are the requirements for using digital signatures.  The private key is one that is accessible only to the signer. It is used to generate the digital signature which is then attached to the message. The public key is made available to all those who receive the signed messages from the sender. It is used for verification of the received message. 

 If a file is sent to a friend you should encrypt that file with some code and share that code with your friend so that your friend could access this file with the help of that code.  Private Key is used for personal work to share the files with a particular person. Private Key helps to keep the file secured because it is locked and protected with code and only the person with whom we share the code knows how to open the file. The encryption is so strong that even a super-computer will take years to break the encryption.

Other basic requirements 

A subscriber of the private key and public key pair makes the public key available to all those who are intended to receive the signed message from the subscriber. In case of any dispute between the two sides, there must be some entity with the receiver which will allow the receiver of the message to prove that the message was indeed sent by the subscriber of the key pair. This can be done with the digital signature certificate. A Digital certificate is an essential document in the digital world.

The digital signature assures authentication and will save your digital stuff from getting hacked by the hacked or get leaked somewhere on the internet or to the unwanted user. A digital signature is nothing but an attachment to any piece of electronic information, which represents the content of the document and the identity of the originator of that document uniquely. When a hash value of a message is encrypted with the private key of a person is his digital signature on that e-document. This digital signature, therefore, varies from document to document thus ensuring the authenticity of each word of that document. As a public key of the signer is known, anybody can verify the message and the digital signature. The digital signature ensures the safe and secure use of the internet for e-commerce and e-governance. 

The growing craze of the digital market makes these digital signatures more important. In the upcoming time to these digital businesses will bloom and hence one must understand this digital signature and certificates.

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