Which term describes an attack that uses the same procedure as a replay attack, along with reverse engineering of the protocol to capture the original signal?

• A. Cryptanalysis Attack
• B. Reconnaissance Attack
• C. IoT Hacking Information Gathering
• D. Software Defined Radio Attack (SDR)

Answer: (A)

Understanding how cryptographic weaknesses in a protocol can be exploited beyond a simple replay attack is what this item tests. A replay attack captures a legitimate message and resends it to gain unauthorized access. If the attacker also reverse engineers the protocol to see exactly how the original signal is constructed—how encryption, integrity checks, nonces, and session data are used—they can identify weaknesses and forge messages that the system will accept. This combination of replay behavior with protocol-level analysis and cryptanalytic insight is best described as a cryptanalysis attack. The other options don’t fit because they describe information gathering or hardware-focused radio techniques, which don’t capture the idea of exploiting cryptographic protocol weaknesses in the way described.