Cryptography is a fundamental component of modern information security, designed to protect data from unauthorized access and ensure secure communication in digital environments. One of its primary objectives is confidentiality, which ensures that sensitive information is accessible only to authorized users through encryption techniques. Integrity is another key objective, ensuring that data remains accurate and unaltered during storage or transmission. Cryptography also provides authentication, verifying the identity of users or systems involved in communication. Non-repudiation is an essential objective, preventing individuals from denying their actions, such as sending a message or completing a transaction. Additionally, cryptography supports access control and secure key management, ensuring that only legitimate parties can access protected resources. These objectives collectively contribute to maintaining trust, privacy, and reliability in digital systems and networks. Digital signatures play a crucial role in information security by providing a secure and verifiable method of confirming the authenticity and integrity of digital messages and documents.