Step 1: Select a test case from the dropdown at the top of the simulation.

Step 2: In Part I, enter the key size and mode of operation as shown in the test case details.

Step 3: In Part II, enter the key (hex), IV (hex) or CTR (hex) as required by the selected mode.

Step 4: In Part III, enter the plaintext value.

Step 5: In Part IV, enter the plaintext in hex (padded as needed).

Step 6: In Part V, enter the ciphertext (hex) to check your answer.

Note: For each part, click the "Check your answer" button to validate your input and receive feedback. Use the details and hints provided for each test case to guide your entries.