diff --git a/src/git.xdrm.io/schastsp/client/keyset/keyset.go b/src/git.xdrm.io/schastsp/client/keyset/keyset.go
index 207cbf7..5c47d9a 100644
--- a/src/git.xdrm.io/schastsp/client/keyset/keyset.go
+++ b/src/git.xdrm.io/schastsp/client/keyset/keyset.go
@@ -16,7 +16,7 @@ type T struct {
 	depth    uint16     // cur depth
 
 	sec      []byte     // secret
-	consumed bool       // if secret is consumed
+	mcode    uint8      // migration code (secret renewal)
 	// 0: none
 	// 1: need to migrate
 	// 2: waiting migration
@@ -87,7 +87,9 @@ func (s *T) Decrement() uint16 {
 	s.depth--
 
 	/* (2) If near minDepth (10 far): set consumption to 1 */
-	s.consumed = s.depth <= s.ctx.MinDepth()+s.ctx.DepthThreshold()
+	if s.mcode == 0 && s.depth <= s.ctx.MinDepth()+s.ctx.DepthThreshold() {
+		s.mcode = 1
+	}
 
 	/* (3) Return remaining attempts */
 	return s.depth - s.ctx.MaxDepth()
@@ -128,8 +130,8 @@ func (s *T) Store(writer io.Writer) error {
 	err = binary.Write(writer, binary.BigEndian, s.depth)
 	if err != nil { return err }
 
-	/* (4) Copy migration level */
-	err = binary.Write(writer, binary.BigEndian, s.consumed)
+	/* (4) Copy migration code */
+	err = binary.Write(writer, binary.BigEndian, s.mcode)
 	if err != nil { return err }
 
 	return nil
@@ -174,8 +176,8 @@ func (s *T) Fetch(reader io.Reader) error {
 	err = binary.Read(reader, binary.BigEndian, &s.depth)
 	if err != nil { return err }
 
-	/* (6) Try to copy the consumption level */
-	err = binary.Read(reader, binary.BigEndian, &s.consumed)
+	/* (6) Try to copy the migration code */
+	err = binary.Read(reader, binary.BigEndian, &s.mcode)
 	if err != nil { return err }
 
 	return nil
diff --git a/src/git.xdrm.io/schastsp/client/keyset/keyset.internal.go b/src/git.xdrm.io/schastsp/client/keyset/keyset.internal.go
index d0438de..1d3819d 100644
--- a/src/git.xdrm.io/schastsp/client/keyset/keyset.internal.go
+++ b/src/git.xdrm.io/schastsp/client/keyset/keyset.internal.go
@@ -33,6 +33,6 @@ func (s *T) generate() {
 	s.depth = randMin + uint16(rand.Intn(int(randMax-randMin)))
 
 	/* (3) Reset comsumption level */
-	s.consumed = false
+	s.mcode = 0
 
 }
\ No newline at end of file