What foundational requirement addresses the use of cryptography for information confidentiality?

The foundational requirement that specifically addresses the use of cryptography for information confidentiality is rooted in the principle of Data Confidentiality (DC). This requirement emphasizes the importance of protecting sensitive data from unauthorized access and ensuring that only authorized entities can view or manipulate that information. Cryptography serves as a key mechanism in achieving data confidentiality by transforming plaintext information into an unreadable format, which can only be deciphered by those possessing the appropriate cryptographic keys.

Unlike the other options, Data Confidentiality directly focuses on the protection of information from unauthorized disclosure, making cryptographic techniques integral to maintaining confidentiality in various information systems. Identification and Authentication Control (IAC) pertains more to ensuring that users are who they claim to be, System Integrity (SI) relates to maintaining the accuracy and trustworthiness of data, and Resource Availability (RA) ensures that resources are accessible to authorized users when needed. While all of these aspects are vital for a comprehensive security strategy, they do not specifically address the confidentiality aspect that is central to the use of cryptography.