The present patent application is directed to a data security management system. The system includes a security server configured to store an encryption key to encrypt a file or any data and a decryption key to decrypt the file or the data; a first computing device configured to send an access authorization list with authorization limit to the security server, request an encryption key from the security server, and encrypt the file or data with the encryption key received from the security server; a second computing device configured to request a decryption key from the security server and decrypt the encrypted file with the decryption key received from the security server; and a cloud storage configured to share the file between a first user using the first computing device and a second user using the second computing device.