EncryptedStorage Plugin Overview

The Kapsel EncryptedStorage plugin adds an encrypted key/value pair storage option to Cordova, which uses the same API method signature as the browser’s local storage option and is non-blocking.

This allows you to store data locally and securely on the device, so that you do not have to retrieve the data from the server every time the application is opened. The user can access and view the data on the device. The data in the encrypted local store is protected by the user’s operating system account credentials, so that data cannot be accessessed by anyone who is not logged on as the authenticated user, however, the data stored in local storage is not secure against access by other applications run by the authenticated user, so you should not use encrypted local storage to store sensitive information such as digital rights managment keys or licensing tokens.

Secure storage is an API based on the w3 Web storage API, interface Storage (http://www.w3.org/TR/2013/PR-webstorage-20130409/#the-storage-interface.

Note: On Android, you cannot store more than 1MB for a single key/value pair, as the strings are encoded in UTF-8, which means the maximum length of a complex string that can be successfully stored is less than the maximum length of a string with only simple characters (since simple characters are encoded with a single byte, and complex characters are encoded with up to 4 bytes).