mirror of https://github.com/nucypher/nucypher.git
Added some text to go with diagrams for `Character Concepts`
Fixed typo in `Finnegan's wake` demo documentpull/1365/head
derekpierre
parent
131700974f
commit
007b26d2cf
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Before Width: | Height: | Size: 204 KiB After Width: | Height: | Size: 207 KiB |
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@ -1,74 +1,100 @@
|
|||
Character Concepts
|
||||
==================
|
||||
|
||||
NuCypher's API is written as characters within a cryptological narrative / archetype each fulfilling a particular
|
||||
NuCypher's API is written as characters within a cryptological narrative/archetype each fulfilling a particular
|
||||
role.
|
||||
|
||||
* **Alice**: *"The Data Owner"* - retains full control over the data encrypted for her and determines whom to share the data with
|
||||
* **Enrico**: *"The Encryptor"* - a data source that encrypts data for on behalf of Alice for some encryption key
|
||||
* **Enrico**: *"The Encryptor"* - a data source that encrypts data on behalf of Alice for a configurable encryption key
|
||||
* **Bob**: *"The Data Recipient"* - the data recipient that Alice intends to share data with
|
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* **Ursula**: *"The Proxy in PRE"* - the node on the NuCypher network that stands ready to re-encrypt data in exchange for payment in fees and token rewards; they enforce the access policy created by Alice
|
||||
* **Ursula**: *"The Proxy in PRE"* - the node on the NuCypher Network that stands ready to re-encrypt data in exchange for payment in fees and token rewards; they enforce the access policy created by Alice
|
||||
|
||||
.. _Umbral: https://github.com/nucypher/umbral-doc/blob/master/umbral-doc.pdf
|
||||
|
||||
|
||||
Character Functions
|
||||
-------------------
|
||||
|
||||
|
||||
Alice.Grant
|
||||
^^^^^^^^^^^
|
||||
Alice::Grant
|
||||
^^^^^^^^^^^^
|
||||
|
||||
.. image:: ../.static/img/alice_grant.svg
|
||||
:target: ../.static/img/alice_grant.svg
|
||||
|
||||
Alice may have data that she thinks she may want to share this data in the future. She uses NuCypher to create
|
||||
an encryption key for Enrico to use when generating and storing data. Subsequently, Alice can delegate access to the
|
||||
encrypted data to any recipient she sees fit. It is worth noting that the same encryption key can be used by Enrico
|
||||
even though multiple policies can be created for multiple Bobs. Enrico, therefore, only has to encrypt data once using
|
||||
a configurable asymmetric encryption key in order for data to be re-encrypted for all Bobs who have been granted access.
|
||||
Alice may have data that she may want to share. It is conceivable to think that she would want to classify/categorize her data according
|
||||
to how she envisions sharing her data, each with their own set of permissions - within NuCypher this concept is called
|
||||
a `label`. Alice uses this `label` to categorize data and creates an asymmetric encryption key for Enrico based
|
||||
on the `label`. For example, Alice may use different `labels` and therefore different Enricos for health data,
|
||||
personal data, work-related data. Essentially `labels` are a way to categorize data for sharing - you can think of
|
||||
file system folders as being analogous to `labels`. Alice can delegate access permissions to the encrypted data
|
||||
classified under a `label` to any recipient she sees fit.
|
||||
|
||||
The same encryption key can be used by Enrico even though multiple policies for the generated data can be created
|
||||
for multiple Bobs. Enrico, therefore, only has to encrypt data once using a configurable asymmetric encryption
|
||||
key and data can later be re-encrypted for all Bobs who have been granted access.
|
||||
|
||||
When Alice wants to share this information with Bob, she can create a
|
||||
policy in the NuCypher network to grant access to him. In order to grant access to Bob, Alice must:
|
||||
policy in the NuCypher Network to grant access to him. To grant access to Bob, Alice must:
|
||||
|
||||
#. Create a re-encryption key based on the private key of encryption key and Bob's public key
|
||||
#. Create a re-encryption key based on the asymmetric private key and Bob's public key
|
||||
#. Configure the conditions of the policy e.g. *expiration time, m-of-n threshold values*
|
||||
#. Deploy the policy including associated fees to the blockchain
|
||||
#. Deploy `n` policy arrangements, each containing a re-encryption key fragment, `kFrag`, to `n` nodes on the NuCypher Network
|
||||
|
||||
|
||||
Enrico.Encrypt
|
||||
^^^^^^^^^^^^^^
|
||||
Enrico::Encrypt
|
||||
^^^^^^^^^^^^^^^
|
||||
|
||||
.. image:: ../.static/img/enrico_encrypt.svg
|
||||
:target: ../.static/img/enrico_encrypt.svg
|
||||
|
||||
NuCypher uses the Umbral threshold proxy re-encryption scheme which employs a key encapsulation mechanism (KEM)/ data
|
||||
NuCypher uses the Umbral_ threshold proxy re-encryption scheme which employs a key encapsulation mechanism (KEM)/ data
|
||||
encapsulation mechanism (DEM). In this approach, an ephemeral symmetric key is used to encrypt the data, and the
|
||||
symmetric key is encrypted using an asymmetric encryption key. The encrypted data (the DEM portion) and the
|
||||
encrypted symmetric key (the KEM portion called a `Capsule`) are stored collectively.
|
||||
encrypted symmetric key (the KEM portion called a `capsule`) are stored collectively.
|
||||
|
||||
Even though different blocks of newly generated data may use different symmetric keys, the same asymmetric encryption
|
||||
key provided by Alice is used to encrypt the symmetric key.
|
||||
Even though different blocks of newly generated bulk data may use different symmetric keys, the same asymmetric
|
||||
encryption key provided by Alice is used to encrypt the symmetric key. How and when Enrico uses a new symmetric key
|
||||
is up to the user of the Enrico API.
|
||||
|
||||
|
||||
Bob.Retrieve
|
||||
^^^^^^^^^^^^
|
||||
Bob::Retrieve
|
||||
^^^^^^^^^^^^^
|
||||
|
||||
.. image:: ../.static/img/bob_retrieve.svg
|
||||
:target: ../.static/img/bob_retrieve.svg
|
||||
|
||||
[Lorem ipsum...]
|
||||
When Bob wants to access the data, he must first obtain the encrypted data and `capsule` from encrypted storage.
|
||||
However, this data is currently encrypted and inaccessible to Bob.
|
||||
|
||||
Bob will need to get the `capsule` re-encrypted from being under the encryption key configured by Alice, to
|
||||
instead be encrypted under his public key. Remember that when Alice granted access to Bob, she distributed `n`
|
||||
`kFrags` of a re-encryption key for Bob to `n` Ursulas on the network. Therefore, Bob sends his `capsule` to `n`
|
||||
Ursulas in the NuCypher Network that have a corresponding `kFrag` for that policy. Those Ursulas
|
||||
will use their `kFrag` to perform a partial re-encryption operation on the `capsule` and produce a corresponding
|
||||
ciphertext fragment, `cFrag`. In the same way a `kFrag` is a fragment of a key, a `cFrag` is a fragment of ciphertext.
|
||||
The `cFrag` is returned to Bob, who collects `cFrags` until he obtains a threshold, `m`, number of `cFrags`.
|
||||
Bob attaches `m` received `cFrags` to the original `capsule` to obtain the fully re-encrypted `capsule` that is now
|
||||
encrypted under his public key. Note that the generation of a complete re-encrypted `capsule` is possible from a
|
||||
smaller number of `cFrags` than the number of `kFrags` originally sent out to Ursulas (m-of-n threshold scheme). Bob
|
||||
can now decrypt the `capsule` to obtain the symmetric key originally used to encrypt the bulk data.
|
||||
|
||||
Once Bob has the symmetric key, he can use it to decrypt the bulk data. This process can be repeated as more data is
|
||||
shared with Bob that is associated with `label` for the policy.
|
||||
|
||||
Ultimately, because of the KEM/DEM approach, only the `capsule` needs to be re-encrypted for Bob.
|
||||
Subsequently, the size of the actual bulk data is irrelevant - whether 1KB or 1GB the re-encryption operation only
|
||||
needs to be performed on the fixed size `capsule`, which is simply an encrypted symmetric key.
|
||||
|
||||
|
||||
Ursula.Reencrypt
|
||||
^^^^^^^^^^^^^^^^
|
||||
Ursula::Reencrypt
|
||||
^^^^^^^^^^^^^^^^^
|
||||
|
||||
.. image:: ../.static/img/ursula_reencrypt.svg
|
||||
:target: ../.static/img/ursula_reencrypt.svg
|
||||
|
||||
[Lorem ipsum...]
|
||||
|
||||
|
||||
Alice.Revoke
|
||||
^^^^^^^^^^^^
|
||||
|
||||
[Lorem ipsum...]
|
||||
Having previously received a `kFrag` from Alice when the policy arrangement was issued, Ursula can now partially
|
||||
re-encrypt data for Bob. Ursulas use their `kFrag` on the `capsule` provided by Bob and return a
|
||||
corresponding `cFrag`. Bob will require `m` of these interactions with `m` different Ursulas to obtain a fully
|
||||
re-encrypted `capsule`.
|
||||
|
|
|
|||
|
|
@ -22,7 +22,7 @@ without revealing data keys to intermediary entities.
|
|||
+======+===========+==============================================================================================+
|
||||
| 1 | Alice | Alice sets a Policy on the NuCypher network (2-of-3) and grants access to Bob |
|
||||
+------+-----------+----------------------------------------------------------------------------------------------+
|
||||
| 2 | Alice | Label and Alice's key public key provided to Bob |
|
||||
| 2 | Alice | Label and Alice's public key provided to Bob |
|
||||
+------+-----------+----------------------------------------------------------------------------------------------+
|
||||
| 3 | Bob | Bob joins the policy with Label and Alice's public key |
|
||||
+------+-----------+----------------------------------------------------------------------------------------------+
|
||||
|
|
|
|||
Loading…
Reference in New Issue