What is a Cryptography?

Cryptography is the practice and study of techniques for secure communication and data protection in the presence of third parties. In blockchain technology, cryptography ensures data integrity, transaction confidentiality, and authentication. Key cryptographic methods include public-key cryptography for secure communication, hash functions for data integrity, and digital signatures for verification. Cryptography is essential in blockchain to ensure that only authorized parties can access or alter sensitive information, making it a cornerstone of secure decentralized systems.