Secure sharing and collaborative editing of documents in cloud based applications

A computer-implemented method for collaboratively editing a document in a system of sharee clients, comprising:

• encrypting, with a document token, a document change to the document;
• splitting the document token into a server document token and a sharee document token;
• generate a plurality of copies of the sharee document token;
• encrypting each of the plurality of copies of the sharee document tokens with a public key of a respective sharee client;
• and
• distributing each encrypted sharee document token to the respective sharee clients.

A computer-implemented system for collaboratively editing a document between a plurality of sharee clients, comprising:

• a hardware processor configured to initiate the following executable operations:
• encrypting, with a document token, a document change to the document;
• splitting the document token into a server document token and a sharee document token;
• generate a plurality of copies of the sharee document token;
• encrypting each of the plurality of copies of the sharee document tokens with a public key of a respective sharee client;
• and
• distributing each encrypted sharee document token to the respective sharee clients.

A computer program product, comprising

• a hardware storage device having stored therein program code for collaboratively editing a document in a system of sharee clients,
• the computer program product, which when executed by a computer hardware system, causes the computer hardware system to perform:
• encrypting, with a document token, a document change to the document;
• splitting the document token into a server document token and a sharee document token;
• generate a plurality of copies of the sharee document token;
• encrypting each of the plurality of copies of the sharee document tokens with a public key of a respective sharee client;
• and
• distributing each encrypted sharee document token to the respective sharee clients.