SEC GUY / JOB READY / ENCRYPTION LAB 09
Same input. Different exposure.
Compare the repeated-block pattern ECB would reveal with actual browser AES-CBC output for repeated sample blocks.
Start this lab →09 / 10 PATTERN LEAKSBrowser-based trainingSafe sample data only
UNDERSTAND THE IDEA
Patterns and block modes
ECB independently transforms blocks, so identical plaintext blocks under one key produce identical ciphertext blocks. CBC chaining hides that simple equality pattern, but CBC alone does not authenticate data. Modern designs often use AES-GCM.
Run the comparison. Observe repeated labels on the ECB concept side and different ciphertext block prefixes on the CBC side.
INTERACTIVE / LAB 09
Try it yourself.
Use fictional input only. Your learning actions run locally in this browser tab.
ECB / concept illustration
CBC / actual AES output
Interpretation
CHECK YOUR UNDERSTANDING