OpenSSL

openssl aes-256-cbc -pbkdf2 -a -d -in cipher.encrypted -out cipher.recovered -k password

In this instance, the openssl command reverses the encryption of the file with a secure symmetric cipher, as indicated by AES-256-CBC. The -pbkdf2 option is used to add extra security to the key, and -a indicates the desired encoding for the output. The -d indicates decrypting, while -in specifies the input file and -out specifies the output file. The -k specifies the password, which in this example is password.