<h3><strong>Introduction to Cryptography</strong></h3><p>Cryptography is the science of securing communication and information through codes and ciphers. It ensures that data remains confidential, authentic, and tamper-proof. Cryptography techniques, like <strong>encryption</strong>, <strong>hashing</strong>, and <strong>digital signatures</strong>, are widely used in fields such as data security, secure communications, and cryptocurrency. In blockchain, cryptography plays a crucial role by verifying transactions, securing identities, and preventing fraud.</p>