diff --git a/pyrogram/crypto/rsa.py b/pyrogram/crypto/rsa.py
index 0ff1252c..d500b2a4 100644
--- a/pyrogram/crypto/rsa.py
+++ b/pyrogram/crypto/rsa.py
@@ -27,7 +27,7 @@ class RSA:
 
     # TODO Add CDNs keys
     server_public_keys = {
-        0xc3b42b026ce86b21 - (1 << 64): PublicKey(
+        0xc3b42b026ce86b21 - (1 << 64): PublicKey(  # Main
             # -----BEGIN RSA PUBLIC KEY-----
             # MIIBCgKCAQEAwVACPi9w23mF3tBkdZz+zwrzKOaaQdr01vAbU4E1pvkfj4sqDsm6
             # lyDONS789sVoD/xCS9Y0hkkC3gtL1tSfTlgCMOOul9lcixlEKzwKENj1Yz/s7daS
@@ -48,6 +48,28 @@ class RSA:
                 16
             ),  # Modulus
             int("010001", 16)  # Exponent
+        ),
+        0x15931aac70e0d30f7 - (1 << 64): PublicKey(  # CDN DC121 (Test)
+            # -----BEGIN RSA PUBLIC KEY-----
+            # MIIBCgKCAQEA+Lf3PvgE1yxbJUCMaEAkV0QySTVpnaDjiednB5RbtNWjCeqSVakY
+            # HbqqGMIIv5WCGdFdrqOfMNcNSstPtSU6R9UmRw6tquOIykpSuUOje9H+4XVIKquj
+            # yL2ISdK+4ZOMl4hCMkqauw4bP1Sbr03vZRQbU6qEA04V4j879BAyBVhr3WG9+Zi+
+            # t5XfGSTgSExPYEl8rZNHYNV5RB+BuroVH2HLTOpT/mJVfikYpgjfWF5ldezV4Wo9
+            # LSH0cZGSFIaeJl8d0A8Eiy5B9gtBO8mL+XfQRKOOmr7a4BM4Ro2de5rr2i2od7hY
+            # Xd3DO9FRSl4y1zA8Am48Rfd95WHF3N/OmQIDAQAB
+            # -----END RSA PUBLIC KEY-----
+            int(
+                "F8B7F73EF804D72C5B25408C6840245744324935699DA0E389E76707945BB4D5"
+                "A309EA9255A9181DBAAA18C208BF958219D15DAEA39F30D70D4ACB4FB5253A47"
+                "D526470EADAAE388CA4A52B943A37BD1FEE175482AABA3C8BD8849D2BEE1938C"
+                "978842324A9ABB0E1B3F549BAF4DEF65141B53AA84034E15E23F3BF410320558"
+                "6BDD61BDF998BEB795DF1924E0484C4F60497CAD934760D579441F81BABA151F"
+                "61CB4CEA53FE62557E2918A608DF585E6575ECD5E16A3D2D21F471919214869E"
+                "265F1DD00F048B2E41F60B413BC98BF977D044A38E9ABEDAE01338468D9D7B9A"
+                "EBDA2DA877B8585DDDC33BD1514A5E32D7303C026E3C45F77DE561C5DCDFCE99",
+                16
+            ),  # Modulus
+            int("010001", 16)  # Exponent
         )
     }