updates

emailflow.md

@@ -1,5 +1,26 @@
 # Email Flow
 
+In creating an email flow that maintains PRIVACY and SECURITY whilst also being convenient to use, the following principles were observed:
+
+- Keypair must be generated client-side
+- Keypair must be protected by a password
+- There must be protection from keyloggers
+- It must be possible to change the password
+- It must remain possible to work offline
+- Network traffic must not contain identifying metadata
+
+All of the above is achieved using a high level flow as follows:
+
+1. Generate temporary key pair for secure server communication
+2. Validate email using a 6 digit code
+3. Provide some server side entropy to client
+4. Combine entropy + complex user password to encrypt the final keypair
+5. Store the encrypted keypair on the server
+
+The password is only used to encrypt the key and is never stored or sent anywhere.  Hence, the server cannot decrypt the backup.  All key signing / encryption operations happen on client side using [private class properties](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Classes/Private_properties).
+
+## SIGNUP FLOW
+
 
 ```mermaid
 sequenceDiagram
@@ -12,11 +33,11 @@ sequenceDiagram
     U->>W: Click SIGNUP and enter <br>email address
     Note over W: Ephemeral key generated <br> to communicate with DVM
     W->>D: Request Account
-    Note right of W: Event uses PoW and<br> encrypts only EMAIL<br> to DVM pubkey
+    Note right of W: Event uses PoW and<br> encrypts only EMAIL<br> to dvm@sigit.io pubkey
     D -x DB: Verify PoW and check<br> if email exists
     Note over D: If email already exists, <br>send user to LOGIN.<br> Otherwise#58;
-    D->>DB: Create Account
+    D->>DB: Create Temp Session
-    Note over DB: Create entries#58;<br>#128274;user.id=uid()<br>user.email=lowcase(email())<br>user.verified=false<br>user.activated=false<br>user.entropy=""<br>user.pubkey=""<br>user.created_at=now()<br>user.bkp=""<br>#128274;session.pubkey="ephemeral pubkey"<br>session.user_id=user.id<br>session.email_code=INT (6 digits)<br>session.created_at=now()
+    Note over DB: SESSION entry#58;<br>#128274;session.pubkey="ephemeral pubkey"<br>session.email=lowcase($EMAIL)<br>session.email_code=INT (6 digits)<br>session.created_at=now()
     D->>U: Send session.email_code via email
     D->>W: Account created
     Note left of D: Payload is an empty string or<br> an encrypted (and detailed)<br> error message
@@ -26,12 +47,14 @@ sequenceDiagram
     W->>D: Verify Account
     Note right of W: Event uses PoW and <br>encrypts only CODE<br> to DVM pubkey
     D -x DB: Check email_code where <br>session pk=event pk
-    D->>DB: If code matches,<br>Update Account
+    D->>DB: If code matches,<br>create User Account
-    Note over DB: user.verified=true<br>user.entropy=uid()
+    Note over DB: USER entry#58;<br>#128274;user.id=uid()<br>user.email=session.email<br>user.pubkey=""<br>user.activated=false<br>user.created_at=now()<br>user.bkp=""<br>user.entropy=uid()
     D->>W: Provide user.entropy
     Note left of D: Payload encrypted to ephemeral <br>pubkey. Is either a UID or a <br> detailed error message.
+    Note over W: Client verifies that <br> DVM response came from <br> DVM pubkey
     W->>U: Ask for secure password
     Note right of U: This password is what prevents<br>backend from decrypting the nsec
+    Note right of U: User is warned that they CANNOT<br>RESET PASSWORD, should USE <br>PASSWORD MANAGER etc
     U->>W: Enter password (twice)
 
     Note over W: Nostr Keypair Generated <br> & Encrypted inside a <br> PRIVATE METHOD,<br>using password + entropy.<br> Password variable is not <br>stored, sent or printed <br> anywhere. Temporary <br>variables are destroyed.