diff --git a/Makefile b/Makefile
index df7d6c7..bcb9879 100644
--- a/Makefile
+++ b/Makefile
@@ -42,10 +42,12 @@ ifeq ($(SE050_CHIP),SE050C0)
     CHIP_ID = 0
 else ifeq ($(SE050_CHIP),SE050C1)
     CHIP_ID = 1
-else ifeq ($(SE050_CHIP),SE050E2)
+else ifeq ($(SE050_CHIP),SE050C2)
     CHIP_ID = 2
+else ifeq ($(SE050_CHIP),SE050E2)
+    CHIP_ID = 3
 else
-    $(error Invalid SE050_CHIP. Use SE050C0, SE050C1, or SE050E2)
+    $(error Invalid SE050_CHIP. Use SE050C0, SE050C1, SE050C2, or SE050E2)
 endif
 
 # Default target
diff --git a/include/se050_scp03_keys.h b/include/se050_scp03_keys.h
index 7176e71..1d1a23d 100644
--- a/include/se050_scp03_keys.h
+++ b/include/se050_scp03_keys.h
@@ -23,12 +23,20 @@ extern const uint8_t SE050C0_DEK_KEY[16];
 
 /* ============================================================================
  * SE050C1 Platform SCP03 Keys
+ * 
+ * Note: SE050C2 uses the same PlatformSCP03 keys as SE050C1.
+ * See AN12436 for details.
  * ============================================================================ */
 
 extern const uint8_t SE050C1_ENC_KEY[16];
 extern const uint8_t SE050C1_MAC_KEY[16];
 extern const uint8_t SE050C1_DEK_KEY[16];
 
+/* SE050C2 uses same keys as SE050C1 */
+#define SE050C2_ENC_KEY    SE050C1_ENC_KEY
+#define SE050C2_MAC_KEY    SE050C1_MAC_KEY
+#define SE050C2_DEK_KEY    SE050C1_DEK_KEY
+
 /* ============================================================================
  * SE050E2 Platform SCP03 Keys
  * ============================================================================ */
diff --git a/tests/test_scp03_se050.c b/tests/test_scp03_se050.c
index 5b114d9..eda94c9 100644
--- a/tests/test_scp03_se050.c
+++ b/tests/test_scp03_se050.c
@@ -29,6 +29,17 @@
 
 /* ============================================================================
  * Chip Selection and Key Mapping
+ * 
+ * Important: This test uses chip-specific PlatformSCP03 keys at compile time.
+ * The keys are NOT replaced at runtime - they are selected via SE050_CHIP macro.
+ * 
+ * To test with different keys:
+ *   make SE050_CHIP=SE050C0 test_se050   # Use SE050C0 default keys
+ *   make SE050_CHIP=SE050C1 test_se050   # Use SE050C1 default keys
+ *   make SE050_CHIP=SE050E2 test_se050   # Use SE050E2 default keys
+ * 
+ * For custom keys, modify se050_scp03_keys.h or pass custom keys at runtime
+ * via se050_session_scp03_set_keys() (not implemented in this test).
  * ============================================================================ */
 
 #ifndef SE050_CHIP
@@ -38,7 +49,8 @@
 /* Chip type constants */
 #define CHIP_SE050C0    0
 #define CHIP_SE050C1    1
-#define CHIP_SE050E2    2
+#define CHIP_SE050C2    2
+#define CHIP_SE050E2    3
 
 #if SE050_CHIP == CHIP_SE050C0
     #define CHIP_NAME "SE050C0"
@@ -52,6 +64,12 @@
     #define ENC_KEY SE050C1_ENC_KEY
     #define MAC_KEY SE050C1_MAC_KEY
     #define DEK_KEY SE050C1_DEK_KEY
+#elif SE050_CHIP == CHIP_SE050C2
+    #define CHIP_NAME "SE050C2"
+    #define SE050_DEFAULT_I2C_ADDR 0x48  /* 7-bit address */
+    #define ENC_KEY SE050C2_ENC_KEY
+    #define MAC_KEY SE050C2_MAC_KEY
+    #define DEK_KEY SE050C2_DEK_KEY
 #elif SE050_CHIP == CHIP_SE050E2
     #define CHIP_NAME "SE050E2"
     #define SE050_DEFAULT_I2C_ADDR 0x48  /* 7-bit address */
@@ -59,7 +77,7 @@
     #define MAC_KEY SE050E2_MAC_KEY
     #define DEK_KEY SE050E2_DEK_KEY
 #else
-    #error "Invalid SE050_CHIP. Use SE050C0, SE050C1, or SE050E2"
+    #error "Invalid SE050_CHIP. Use SE050C0, SE050C1, SE050C2, or SE050E2"
 #endif
 
 /* ============================================================================