Digital Signature

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Digital signature is a carefully worked-out scheme for validating the legitimacy of messages or documents that are digital. A binding digital signature gives the receiver benefit of doubt that the received document was from the sender. Later on the sender cannot repudiate having written and sent the message. The signature is useful in proving that the documents are legit and not altered thus promoting integrity. This is a customary element of numerous cryptographic protocol programs and is mostly used during financial transactions, software distribution and other various cases where forgery and tampering of the documents is alarming and prohibited.


Digital signatures are mostly used in implementing electronic signature. In various countries such as Brazil, India, Saudi Arabia, United States, Switzerland and European union where the electronic signature has some legal standing. The signature is created in such a way that they are able to deliver a layer of security and complete validation to the documents and messages sent through channels that are non-secure. If properly used the signature gives recipient of the message a valid reason to claim the sender sent the message.

Digital Signature- image 1

The digital signature and seals are just the same as signatures that are handwritten and stamped seals. However, signature that are digital are more hard to forge if they are implemented properly. A person must implement them accurately to make them more effective. They are often able to offer non repudiation. This means that a person cannot claim that they didn’t sign the document and at the same time claim that they didn’t send the document. In this system an time stamp for the sent message is seen.

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There are several additional security precaution put in place to prevent tampering of the document such as storing of the private key on a smart card. Numerous smart cards are specifically designed to protect them from tampering. Other security measures include using a separate keyboard with the card readers, using the signatures with trusted applications and using networks that are attached to hardware security module.


Below are some of the common reasons as to why digital signatures are used:

For authentication purposes

Digital signatures can be used to validate the messages sources. This is greatly used in financial context where the sent information valuable and one cannot afford miscommunication. it places high level of trust and confidence on the sender’s validity.


Both the receiver and the sender need to have confidence that the message has not been tampered with through alterations during the transition period. This is because in case of any changes after the massage has been signed the signature is invalidated.


It is a very important aspect in digital signatures. A person who has signed and sent the message has no legal ground of denying that he or she has not signed the message. They rely on secret key that only the user has access to. Of course there is stolen key pair theft. However, they should be reported and change. This prevents forgery of messages or documents.

People should adapt this system since it’s efficient and effective of sending a secured important message through the internet.