diff --git a/archiver_test.go b/archiver_test.go
new file mode 100644
index 000000000..529b2bb5f
--- /dev/null
+++ b/archiver_test.go
@@ -0,0 +1,53 @@
+package khepri_test
+
+import (
+	"bytes"
+	"io"
+	"math/rand"
+	"testing"
+
+	"github.com/fd0/khepri/chunker"
+)
+
+func get_random(seed, count int) []byte {
+	buf := make([]byte, count)
+
+	rnd := rand.New(rand.NewSource(23))
+	for i := 0; i < count; i += 4 {
+		r := rnd.Uint32()
+		buf[i] = byte(r)
+		buf[i+1] = byte(r >> 8)
+		buf[i+2] = byte(r >> 16)
+		buf[i+3] = byte(r >> 24)
+	}
+
+	return buf
+}
+
+func BenchmarkChunkEncrypt(b *testing.B) {
+	data := get_random(23, 10<<20) // 10MiB
+
+	be := setupBackend(b)
+	defer teardownBackend(b, be)
+	key := setupKey(b, be, "geheim")
+
+	b.ResetTimer()
+	b.SetBytes(int64(len(data)))
+
+	for i := 0; i < b.N; i++ {
+		ch := chunker.New(bytes.NewReader(data))
+
+		for {
+			chunk_data, err := ch.Next()
+
+			if err == io.EOF {
+				break
+			}
+
+			ok(b, err)
+
+			_, err = key.Encrypt(chunk_data.Data)
+			ok(b, err)
+		}
+	}
+}