The log-in activity indicates a security threat, particularly involving the ADMIN account with a high- risk failure status. This suggests that the account may be targeted by malicious activities such as credential stuffing or brute force attacks.

Homomorphic encryption allows computations to be performed on encrypted data without decrypting it, providing strong privacy guarantees. However, the adoption of homomorphic encryption is challenging due to several factors:
Insufficient coprocessor support: The computational overhead of homomorphic encryption is significant, requiring substantial processing power. Current general-purpose processors are not optimized for the intensive computations required by homomorphic encryption, limiting its practical deployment. Specialized hardware or coprocessors designed to handle these computations more efficiently are not yet widely available.

User entity controls are responsibilities that must be implemented by the organization, so determining how to implement and monitor them is critical.
Monitoring the CSP or auditing their implementation pertains to the CSP's responsibilities, not complementary user entity controls.

A proxy-based Cloud Access Security Broker (CASB) is chosen primarily for its ability to block unapproved applications and services.
Application and Service Control: Proxy-based CASBs can monitor and control the use of applications and services by inspecting traffic as it passes through the proxy. This allows the organization to enforce policies that block unapproved applications and services, ensuring compliance with security policies.
Visibility and Monitoring: By routing traffic through the proxy, the CASB can provide detailed visibility into user activities and data flows, enabling better monitoring and threat detection.
Real-Time Protection: Proxy-based CASBs can provide real-time protection against threats by analyzing and controlling traffic before it reaches the end user, thus preventing the use of risky applications and services.