diff --git a/tools/targets/ARM_MUSCA_B1.py b/tools/targets/ARM_MUSCA_B1.py
index 64d659ff7ad..948d590f873 100644
--- a/tools/targets/ARM_MUSCA_B1.py
+++ b/tools/targets/ARM_MUSCA_B1.py
@@ -71,7 +71,7 @@ def musca_tfm_bin(t_self, non_secure_bin, secure_bin):
     #2. Run imgtool to sign the non-secure mbed binary
     sign_args = Namespace(
         layout=image_macros_ns,
-        key=path_join(SCRIPT_DIR, 'musca_b1-root-rsa-3072.pem'),
+        key=path_join(SCRIPT_DIR, 'musca_b1-root-rsa-3072_1.pem'),
         public_key_format=None,
         align=1,
         dependencies=None,
diff --git a/tools/targets/musca_b1-root-rsa-3072.md b/tools/targets/musca_b1-root-rsa-3072.md
index 277728a4216..76596759a17 100644
--- a/tools/targets/musca_b1-root-rsa-3072.md
+++ b/tools/targets/musca_b1-root-rsa-3072.md
@@ -2,7 +2,7 @@
 
 A default RSA key pair is given to the Musca-B1 target.
 
-Public key was pre-compiled to `targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/prebuilt/mcuboot.bin` and private key is in `musca_b1-root-rsa-3072.pem`.
+Public keys were pre-compiled to `targets/TARGET_ARM_SSG/TARGET_MUSCA_B1/prebuilt/mcuboot.bin` and private key is in `musca_b1-root-rsa-3072.pem` for Secure image and `musca_b1-root-rsa-3072_1.pem` for Non-Secure image.
 
 DO NOT use them in production code, they are exclusively for testing!
 
diff --git a/tools/targets/musca_b1-root-rsa-3072_1.pem b/tools/targets/musca_b1-root-rsa-3072_1.pem
new file mode 100644
index 00000000000..1214eb58061
--- /dev/null
+++ b/tools/targets/musca_b1-root-rsa-3072_1.pem
@@ -0,0 +1,39 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----