Update and rename README.md to filter.md

waku/standards/core/12/previous-versions00/filter.md

@@ -14,7 +14,7 @@ contributors:
 
 `WakuFilter` is a protocol that enables subscribing to messages that a peer receives. This is a more lightweight version of `WakuRelay` specifically designed for bandwidth restricted devices. This is due to the fact that light nodes subscribe to full-nodes and only receive the messages they desire.
 
-# Content filtering
+## Content filtering
 
 **Protocol identifier***: `/vac/waku/filter/2.0.0-beta1`
 
@@ -40,25 +40,25 @@ protocol to query for a recent time window, provided it is acceptable to do
 frequent polling.
 
 
-# Design Requirements
+## Design Requirements
 
 The effectiveness and reliability of the content filtering service enabled by  `WakuFilter` protocol rely on the *high availability* of the full nodes as the service providers. To this end, full nodes must feature *high uptime* (to persistently listen and capture the network messages) as well as *high Bandwidth* (to provide timely message delivery to the light nodes). 
 
-# Security Consideration
+## Security Consideration
 
 Note that while using `WakuFilter` allows light nodes to save bandwidth, it comes with a privacy cost in the sense that they need to disclose their liking topics to the full nodes to retrieve the relevant messages. Currently, anonymous subscription is not supported by the `WakuFilter`, however, potential solutions in this regard are sketched below in [Future Work](#future-work) section. 
 
-## Terminology
+### Terminology
 The term Personally identifiable information (PII) refers to any piece of data that can be used to uniquely identify a user. For example, the signature verification key, and the hash of one's static IP address are unique for each user and hence count as PII.
 
-# Adversarial Model
+## Adversarial Model
 Any node running the `WakuFilter` protocol i.e., both the subscriber node and the queried node are considered as an adversary. Furthermore, we consider the adversary as a passive entity that attempts to collect information from other nodes to conduct an attack but it does so without violating protocol definitions and instructions. For example, under the passive adversarial model, no malicious node intentionally hides the messages matching to one's subscribed content filter as it is against the description of the `WakuFilter` protocol. 
 
 The following are not considered as part of the adversarial model: 
   - An adversary with a global view of all the nodes and their connections. 
   - An adversary that can eavesdrop on communication links between arbitrary pairs of nodes (unless the adversary is one end of the communication). In specific, the communication channels are assumed to be secure.
 
-## Protobuf
+### Protobuf
 
 ```protobuf
 message FilterRequest {
@@ -121,7 +121,7 @@ mechanism is currently planned but underspecified.
 #### MessagePush
 
 A filter node that has received a filter request SHOULD push all messages that
-match this filter to a light node. These [`WakuMessage`'s](./waku-message.md) are likely to come from the
+match this filter to a light node. These [`WakuMessage`'s](../14/message.md) are likely to come from the
 `relay` protocol and be kept at the Node, but there MAY be other sources or
 protocols where this comes from. This is up to the consumer of the protocol.
 
@@ -141,7 +141,7 @@ implementation, though a reasonable default is one minute.
   Note that the current structure of filter requests i.e., `FilterRPC` does not embody any piece of PII, otherwise, such data fields must be treated carefully to achieve anonymity. 
 - By deploying secure 2-party computations in which the subscribing node obtains the messages matching a content filter whereas the full node learns nothing about the content filter as well as the messages pushed to the subscribing node. Examples of such 2PC protocols are [Oblivious Transfers](https://link.springer.com/referenceworkentry/10.1007%2F978-1-4419-5906-5_9#:~:text=Oblivious%20transfer%20(OT)%20is%20a,information%20the%20receiver%20actually%20obtains.) and one-way Private Set Intersections (PSI).
 
-# Changelog
+## Changelog
 
 ### Next
 
@@ -157,12 +157,12 @@ Initial draft version. Released [2020-10-28](https://github.com/vacp2p/specs/com
 
 Initial draft version. Released [2020-10-05](https://github.com/vacp2p/specs/commit/31857c7434fa17efc00e3cd648d90448797d107b)
 
-# Copyright
+## Copyright
 
 Copyright and related rights waived via
 [CC0](https://creativecommons.org/publicdomain/zero/1.0/).
 
-# References
+## References
 
 1. [Message Filtering (Wikipedia)](https://en.wikipedia.org/wiki/Publish%E2%80%93subscribe_pattern#Message_filtering)