bump versioninfo

[xonotic/d0_blind_id.git] / d0_blind_id.txt

diff --git a/d0_blind_id.txt b/d0_blind_id.txt
index 5234fe5c3055be96d4486aa2d4e42834ce0d4f78..7d33aaf9daa495b24871f7a50b0f36c68d1cead4 100644 (file)
--- a/d0_blind_id.txt
+++ b/d0_blind_id.txt
@@ -80,7 +80,7 @@ Authentication protocol:
        "verify":
        - Server receives y and g^t
        - Server calculates z = g^y S^-c
-       - Server calculates x' = h("z || m || z")
+       - Server calculates x' = h("z || g^t || m || z || g^t")
        - Server verifies x == x'
        - Server calculates K = (g^t)^T
 
@@ -93,6 +93,20 @@ the same values on both sides only if the Schnorr identification scheme
 succeeds. If the protocol succeeds, the authenticity of m has been verified
 too.
 
+Signature protocol:
+       Client provides a message m that is to be signed as part of the protocol
+       "start":
+       - Client sends S, H if this is the first round of the protocol
+       - Client generates r in [0, |G|[ at random
+       - Client sends c = h("m || g^r")
+       - Client sends y = r + s * c
+       - Client sends m in plain
+       "verify":
+       - Server receives c, y, and m
+       - Server calculates z = g^y S^-c
+       - Server calculates c' = h("m || z")
+       - Server verifies c == c'
+
 
 
 Low level protocol:
@@ -113,3 +127,31 @@ Low level protocol:
          "packet"
        - a value in double quotes is also defined in terms of this protocol, i.e.
          the length is preceded
+
+
+
+NOTE: to generate NON blind IDs, the process is not very straightforward. It
+works like this:
+
+Server shall:
+- load private key
+
+Both shall:
+- perform authentication as usual
+
+Server shall:
+- notice that the status is false
+- call d0_blind_id_authenticate_with_private_id_generate_missing_signature
+- write public ID
+- send that data to client
+
+Client shall:
+- read own private ID
+- get fingerprint
+- read received public ID (leaves the private part alone)
+- verify fingerprint
+- possibly verify ID
+- write own private ID again
+
+This ensures that only the ID the client authenticated with is signed by the
+server