--- /dev/null
+<?xml version="1.0"?>
+<!--
+###################################################
+## Additive Scrambler
+###################################################
+ -->
+<block>
+ <name>Additive Scrambler</name>
+ <key>gr_additive_scrambler_bb</key>
+ <import>from gnuradio import gr</import>
+ <make>gr.additive_scrambler_bb($mask, $seed, $len, $count)</make>
+ <param>
+ <name>Mask</name>
+ <key>mask</key>
+ <value>0x8A</value>
+ <type>hex</type>
+ </param>
+ <param>
+ <name>Seed</name>
+ <key>seed</key>
+ <value>0x7F</value>
+ <type>hex</type>
+ </param>
+ <param>
+ <name>Length</name>
+ <key>len</key>
+ <value>7</value>
+ <type>int</type>
+ </param>
+ <param>
+ <name>Count</name>
+ <key>count</key>
+ <value>0</value>
+ <type>int</type>
+ </param>
+ <sink>
+ <name>in</name>
+ <type>byte</type>
+ </sink>
+ <source>
+ <name>out</name>
+ <type>byte</type>
+ </source>
+</block>