Decrypt given data previously encoded with camellia-256-ecb cipher algo. Camellia in 256-bit key size with ECB mode, encrypting each block independently without chaining. ECB is a simple mode but considered insecure for many applications due to the potential for pattern leakage in ciphertext. While Camellia is secure, ECB mode is insecure and should be avoided for most use cases due to its vulnerability to block repetition attacks. Our decryption process assumes the IV string is prepended in the encoded string during the encryption process. You can not decrypt and get the correct results if the IV or passphrase mismatch occurs between encryption and decryption process.