[DOC] Trivial remark about inverse Elligator

[govpn.git] / doc / handshake.texi

diff --git a/doc/handshake.texi b/doc/handshake.texi
index c15e45643857004d2ae4f07b3fe97339fcff7ef8..c509c094432aa70533e35b1c581cdb0c4a234691 100644 (file)
--- a/doc/handshake.texi
+++ b/doc/handshake.texi
@@ -9,7 +9,7 @@ a key. It is used to transmit identity and to mark packet as handshake
 message.
 
 If @ref{Noise} is enabled, then junk data is inserted before
-@code{IDtag} to full up packet to MTU's size.
+@code{IDtag} to fill up packet to MTU's size.
 
 @strong{Preparation stage}:
 
@@ -24,7 +24,8 @@ Client computes verifier which produces @code{DSAPriv} and
 @item
 Client generates DH keypair: @code{CDHPub} and @code{CDHPriv}.
 Also it generates random 64-bit @code{R} that is used as a nonce for
-symmetric encryption. @code{El()} is Elligator point encoding algorithm.
+symmetric encryption. @code{El()} is Elligator point encoding (and vice
+versa) algorithm.
 @end enumerate
 
 @strong{Interaction stage}:
@@ -34,7 +35,7 @@ symmetric encryption. @code{El()} is Elligator point encoding algorithm.
 @verb{|R + enc(H(DSAPub), R, El(CDHPub)) + IDtag -> Server|} [48 bytes]
 
 @item
-@itemize @bullet
+@itemize
 @item Server remembers client address.
 @item Decrypts @code{El(CDHPub)}.
 @item Inverts @code{El()} encoding and gets @code{CDHPub}.
@@ -48,7 +49,7 @@ symmetric encryption. @code{El()} is Elligator point encoding algorithm.
 @verb{|enc(H(DSAPub), R+1, El(SDHPub)) + enc(K, R, RS + SS) + IDtag -> Client|} [80 bytes]
 
 @item
-@itemize @bullet
+@itemize
 @item Client decrypts @code{El(SDHPub)}.
 @item Inverts @code{El()} encoding and gets @code{SDHPub}.
 @item Computes @code{K}.
@@ -63,7 +64,7 @@ symmetric encryption. @code{El()} is Elligator point encoding algorithm.
 @verb{|enc(K, R+1, RS + RC + SC + Sign(DSAPriv, K)) + IDtag -> Server|} [120 bytes]
 
 @item
-@itemize @bullet
+@itemize
     @item Server decrypts @code{RS}, @code{RC}, @code{SC},
     @code{Sign(DSAPriv, K)}.
 
@@ -81,7 +82,7 @@ symmetric encryption. @code{El()} is Elligator point encoding algorithm.
 @verb{|ENC(K, R+2, RC) + IDtag -> Client|} [16 bytes]
 
 @item
-@itemize @bullet
+@itemize
 @item Client decrypts @code{RC}
 @item Compares with its own one sent before.
 @item Computes final session encryption key as server did.
@@ -93,3 +94,6 @@ symmetric encryption. @code{El()} is Elligator point encoding algorithm.
 has 128-bit security margin and that is why are not in use except in
 handshake process. @code{R*} are required for handshake randomization
 and two-way authentication.
+
+In @ref{Encless, encryptionless mode} each @code{enc()} is replaced with
+AONT and chaffing function over the noised data.