Provided an encrypted message using AES CBC mode with PKCS#5 padding, an encrypted AES key in the form of an audio .wav file that is first encoded using RSA with Optimal Asymmetric Encryption Padding (OAEP) using SHA-256 hashing and MGF-1 padding and then encoded to an audio file using Bell202 encoding at 200 bits/sec, and an RSA private key, output the decoded message. The 32 byte AES IV has been placed as the first 32 bytes of the encrypted message.

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Last Solution submitted on Apr 24, 2026

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