METHOD FOR SECURE STORING AND SHARING OF A DATA FILE VIA A COMPUTER COMMUNICATION NETWORK AND OPEN CLOUD SERVICES

摘要

The invention relates to a computer implemented method, a server computer and a computer program for secure storing of a data file via a computer communication network and open cloud services. The method comprises the steps of providing a computer device of a user with code for providing a unique user name for the user; asking the user for a password; generating an asymmetric key pair for the user having one public key and one private key; encrypting the private key of the user by means of a hash of the password; generating a file-specific symmetric key specific for the data file; encrypting the data file by means of the file-specific symmetric key; encrypting the file-specific symmetric key by means of the public key of the user; where the code is executed by a web browser on the computer device. Storing the encrypted file-specific symmetric key as a header part of the encrypted data file, and interact with the file exchange interface of a cloud service where the cloud service receiving the encrypted data file and storing the encrypted data file and header part. The server is then storing the encrypted file-specific symmetric key in a file management system, and is storing the public key of the user and the encrypted private key of the user in a user management system.