Why Digital Signatures ??

Designing new systems to authenticate users has proven to be costly and cumbersome, requiring too many technical skills for users. Most consumers don't want to take on commitments without physically signing a document in person. A range of techniques for authentication have been developed and tested. But none of them has been efficient and effective enough. Thus, nowadays its Digital Signature that is trying to provide answers to all.

Digital signatures are a form of electronic signature. The term electronic signature is used to describe the full range of electronic means to confirm the sender of the message. They range from a file including a graphical image of the sender's handwritten signature (simple but unreliable) to biometric techniques, such as iris scans (complex but reliable).

Digital signatures are based on public key technology, a special form of encryption invented in the 1970s, which uses two different keys (because two different keys are used, this form of encryption is also known as asymmetric cryptography). One key is kept secret (the private key), whereas the other key is made publicly available (the public key). The two keys are generated simultaneously and collectively are known as a "key pair." Once a message has been encrypted using one of the two keys, it can only be decrypted by the other key.