What is a system of a secure key pair consisting of a private key for creating a digital signature and a public key to verify the digital signature, known as :

The term Asymmetric crypto system (also known as Public Key Cryptography) refers to a cryptographic system that uses a pair of keys: a private key, which is kept secret by the owner and used to create a digital signature, and a public key, which is made available to others to verify that signature.

This definition is explicitly provided under Section 2(1)(f) of the Information Technology Act, 2000 in India. This system ensures authenticity, integrity, and non-repudiation in electronic transactions. In contrast, a Symmetric crypto system uses the same single key for both encryption and decryption. While a Digital Signature Certificate uses this system, it is the electronic document issued by a Certifying Authority, not the underlying cryptographic system itself.