The author of the linked blog post has a post exactly about this: https://www.imperialviolet.org/2014/06/27/streamingencryption.html https://www.imperialviolet.

The author of the linked blog post has a post exactly about this: https://www.imperialviolet.org/2014/06/27/streamingencryption.html https://www.imperialviolet.org/2014/06/27/streamingencryptio... (I defined and implemented a variant of Adam's idea with NaCl secretboxes: https://github.com/dchest/nacl-stream-js https://github.com/dchest/nacl-stream-js)