Certified Encryption Specialist (ECES) v3 — Question 3

In a __________________, the attacker discovers a functionally equivalent algorithm for encryption and decryption but without learning the key.

Answer options

• A. Information deduction
• B. Instance deduction
• C. Total break
• D. Global deduction

Correct answer: C

Explanation

The correct answer is 'Total break' because it describes a situation where an attacker can decrypt data without needing the key by discovering an equivalent algorithm. The other options do not represent this scenario accurately, as they focus on different aspects of security compromise.