What is the definition of scheme in cryptography?

In cryptography, a scheme refers to a specific method or protocol for encrypting and decrypting data to ensure confidentiality, integrity, and authenticity. It encompasses algorithms, key management practices, and operational procedures used to secure communications and data storage. Cryptographic schemes can vary in complexity and application, including symmetric and asymmetric encryption, hash functions, and digital signatures. Overall, they provide a structured approach to protecting sensitive information from unauthorized access and alteration.