[Ndn-interest] [icnrg] Caching Dynamic Content

[David Oran]

Caching is a win under two conditions:
a) for error control (recovering from lost Interest or data messages due 
to congestion, mobility, or other disruptions), or re-fetch of content 
that is unchanged
b) for sharing the same content among multiple consumers.

The former remains useful even if each user gets different content.

The latter is useful only if multiple consumers are getting the same 
identical content, and if the content is unencrypted or encrypted under 
a shared key.

You are right that dynamically generated content that is unique per 
consumer will not experience any sharing gains though caching, but may 
have value for error control or temporal sharing.

Some privacy advocates recommend that all content be encrypted with 
non-shared keys, in order to provide protection against correlation 
attacks, leakage through key sharing not controlled by the consumer, and 
perfect forward secrecy (PFS).

So, there you have it…

On 12 May 2017, at 0:19, n.boubakr at bit.edu.cn wrote:

> Dear all,
>
> Talking about the in-network caching for dynamic-content on ICN, I 
> have the following miss-understanding:
> • Let’s take a scenario when two end-users want to access to the 
> same website (e.g. Facebook), they requested facebook.com/home, well 
> the name appears the same for both users, however, the content of each 
> request is not the same. How does ICN work with this situation, 
> because caching such content is not useful at all (even if the same 
> user requests the same content name, the content will be different)? 
> Does in-network caching have no benefits with dynamic content? Also, 
> how does the content delivery process in this situation (because 
> Interest/Data packets have not the requester name), how ICN nodes 
> distinguish between the two (N) requesters?
> • Another question arises, requesting a video from Youtube for 
> example (the video can be cached on any node), however, the real 
> process is that the Youtube page associated with such video has some 
> dynamic content such as Recommended Videos… Also, the video itself 
> has many ads that appear on the video and they are different from user 
> to another, and cannot be cached, and they are the main business 
> method for the company. How can ICN treat the business model for such 
> situation, as any company will not migrate to ICN if ICN can not 
> ensure a business achievement?
>
>
> Best regards,
>
> Boubakr Nour (Ph.D Candidate)
> Beijing Institute of Technology (北京理工大学)


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DaveO
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