IPFS and encryption

[johnnymatthews]

IPFS deals with encryption in interesting ways. We need a general overview of how IPFS manages encryption, including:

• Where data is and is not encrypted.
• The difference between transport encryption and content encryption.
• Why IPFS doesn't include encryption at rest.
• Examples of projects that are using IPFS with encrypted data.

This overview should be similar in size and layout to the IPFS Gateway overview. This bounty will likely lead to further investigation and research bounties regarding IPFS encryption.

[johnnymatthews]

Duplicate of #497. Closing.