Lightweight document access control using access control lists in the cloud storage or on the local file system

A computer program product for controlling access to an encrypted document, the computer program product comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more computer-readable storage devices, the program instructions comprising:
• program instructions to receive a request to access the encrypted document, wherein the access request comprises a user ID and a user password;
• program instructions to perform a one-way hash function on the user password to generate a hash value;
• program instructions to search an access control table for the hash value which indicates an authorization for the user to access the encrypted document and corresponds to a document password encrypted with the user password;
• program instructions to decrypt the document password using the user password, wherein the document password comprises a decryption key for the encrypted document;
• and
• program instructions to decrypt the encrypted document using the decrypted document password.

A method for controlling access to an encrypted web page, the method comprising the steps of:

• receiving an email message, wherein the email message comprises a hyperlink to the encrypted web page and wherein a markup language document for the encrypted web page includes program code to request a user ID and password from a user of the computer and to determine whether the user is authorized to access the web page, and if so, to decrypt the web page;
• receiving an access control table as an attachment to the email message;
• invoking the program code, in response to a user request to display the encrypted web page, to determine that the user is authorized to access the web page by searching the access control table;
• and
• invoking the program code to decrypt the web page and to display the web page, in response to the determination of authorization of the user to access the web page.

A computer program product for controlling access to an encrypted web page, the computer program product comprising:

• one or more computer-readable storage devices and program instructions stored on at least one of the one or more computer-readable storage devices, the program instructions comprising:
• program instructions to receive an email message, wherein the email message comprises a hyperlink to the encrypted web page and wherein a markup language document for the encrypted web page includes program code to request a user ID and password from a user of the computer and wherein the markup language document for the encrypted web page includes program code to determine whether the user is authorized to access the web page, and if so, to decrypt the web page;
• program instructions to receive an access control table as an attachment to the email message;
• program instructions to invoke the program code, in response to a user request to display the encrypted web page to determine that the user is authorized to access the web page by searching the access control table;
• and
• program instructions to invoke the program code to decrypt the web page and to display the web page at the computer, in response to the determination of authorization of the user to access the web page.