The file s81170-cipher.bin contains data encrypted using the ARIA-128-CBC method. First decrypt data in the file s81170-cipheredkey.bin. They were encrypted with RSA and can be decrypted with the function RSA_private_decrypt (). Optimal asymmetric encryption padding was used. You must therefore specify RSA_PKCS1_OAEP_PADDING as a parameter. You can work with the …