diff --git a/CHANGELOG.md b/CHANGELOG.md
index bf329130..889b63c6 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,12 +2,29 @@
 
 <!-- ... -->
 
-## v1.7.16~
+## v1.7.17~
 
 *??? ??, ????*
 
 <!-- ... -->
 
+## v1.7.16
+
+*May 24, 2026*
+
+### IMPROVEMENTS
+
+- `pkg/crypto/scheme/layer2`: add IKeysContainer
+- `pkg/crypto/scheme/layer2/symmetric`: add symmetric scheme
+
+### CHANGES
+
+- `pkg/crypto/scheme`: move pkg/message/layer1, pkg/message/layer2 -> pkg/crypto/scheme, pkg/crypto/scheme/hybrid
+- `pkg/crypto/scheme`: add CMessageHeadSize const
+- `pkg/crypto/asymmetric`: delete IMapPubKeys
+
+<!-- ... -->
+
 ## v1.7.15
 
 *March 30, 2026*
diff --git a/changelog_test.go b/changelog_test.go
index b4df6c33..13810693 100644
--- a/changelog_test.go
+++ b/changelog_test.go
@@ -8,7 +8,7 @@ import (
 )
 
 const (
-	cVersion = "v1.7.15"
+	cVersion = "v1.7.16"
 )
 
 var (
diff --git a/test/result/coverage.svg b/test/result/coverage.svg
index ed094dc8..00d80f23 100644
--- a/test/result/coverage.svg
+++ b/test/result/coverage.svg
@@ -7,7 +7,7 @@
 >
 
 <g>
-	<rect x="20.000000" y="20.000000" width="988.000000" height="600.000000" style="fill: rgb(5, 116, 61);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
+	<rect x="20.000000" y="20.000000" width="988.000000" height="600.000000" style="fill: rgb(4, 116, 61);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
 	
 <text 
 	data-notex="1" 
@@ -91,7 +91,7 @@
 
 
 <g>
-	<rect x="382.050278" y="357.678049" width="453.650588" height="246.321951" style="fill: rgb(10, 126, 66);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
+	<rect x="382.050278" y="357.678049" width="453.650588" height="246.321951" style="fill: rgb(9, 124, 65);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
 	
 <text 
 	data-notex="1" 
@@ -419,7 +419,7 @@
 
 
 <g>
-	<rect x="390.050278" y="379.278049" width="207.788706" height="216.721951" style="fill: rgb(24, 149, 78);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
+	<rect x="390.050278" y="379.278049" width="207.788706" height="216.721951" style="fill: rgb(22, 146, 77);opacity:1;fill-opacity:1.00;stroke:rgb(128,128,128);stroke-width:1px;stroke-opacity:1.00;" />
 	
 <text 
 	data-notex="1"