For a building block, the characteristics visible only in the whitebox view are:

Code structure of the building block (D)

Algorithms used in the building block (E)

Implementation details for the security requirements of the building blocks (G)

The blackbox view suffices for:

Public interfaces of the building block (A)

Test coverage based on unit tests for sub building blocks contained in the building block (B)

Test coverage based on integration tests ©

Security requirements of the building blocks (F)

In software architecture, the whitebox view reveals the internal workings of a building block, including its code structure, algorithms, and specific implementation details1. This view is essential when the internal structure and behavior of the component need to be understood or modified.

On the other hand, the blackbox view treats the building block as an opaque entity, focusing on its exposed interfaces and observable behaviors without revealing its internal structure2. This view is sufficient for understanding what the building block does from an external perspective, such as its public interfaces and how well it performs its functions as determined by testing.

Here’s a breakdown of the characteristics:

Whitebox View:

Code Structure (D): This includes the organization of code within the building block, such as classes, interfaces, and other components.

Algorithms (E): The specific algorithms used within the building block to perform its functions.

Implementation Details for Security (G): The actual code and strategies used to fulfill the security requirements.

Blackbox View:

Public Interfaces (A): The interfaces that are exposed to other building blocks or systems.

Test Coverage for Sub Building Blocks (B): The extent to which the unit tests cover the sub-components within the building block.

Test Coverage for Integration Tests ©: The coverage of tests that verify the interactions between building blocks.

Security Requirements (F): The security objectives and criteria that the building block must meet.

References:

arc42 Documentation on Building Block View1.

Stack Overflow discussion on the difference between black box and white box in component diagrams2.

Flylib Section on Black-Box and White-Box Component Views3.