What is the role of cryptography in information security?

Cryptography plays a fundamental and multifaceted role in information security, serving as one of the core building blocks for protecting sensitive data, communications, and systems. Its primary role can be understood through various aspects: 1. Confidentiality: - One of the primary roles of cryptography is to ensure the confidentiality of data. It achieves this by encrypting data, transforming it into a format that is unreadable without the appropriate decryption key. Even if an unauthorized party gains access to the encrypted data, they cannot decipher it without the key. 2. Data Protection: - Cryptography is used to protect data both at rest and in transit. Data at rest, such as files stored on a hard drive or in a database, can be encrypted to prevent unauthorized access if physical or digital access is gained. Data in transit, such as information transmitted over networks, is encrypted to prevent interception and eavesdropping. 3. Authentication: - Cryptography helps verify the authenticity of users and systems. Through techniques like digital signatures, it ensures that messages or data originate from legitimate sources. Digital signatures use asymmetric encryption to create a unique....