diff --git a/src/c2se/backend/identity.rs b/src/c2se/backend/identity.rs
index a0f45cc..34360d2 100644
--- a/src/c2se/backend/identity.rs
+++ b/src/c2se/backend/identity.rs
@@ -2,17 +2,27 @@ use crate::protobuf::rpc;
 
 const SUBJECT: &str = "bet.beteran.c2se.backend.identity";
 
+pub const SUBJECT_CAPTCHA: &str = const_format::concatcp!(SUBJECT, ".Captcha");
+/// subject = bet.beteran.c2se.backend.identity.Captcha
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaRequest {}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaResponse {
+  #[prost(message, optional, tag = "1")]
+  pub error: ::core::option::Option<rpc::Error>,
+  #[prost(string, optional, tag = "2")]
+  pub image: ::core::option::Option<::prost::alloc::string::String>,
+}
+
 pub const SUBJECT_SIGNIN: &str = const_format::concatcp!(SUBJECT, ".Signin");
 /// subject = bet.beteran.c2se.backend.identity.Signin
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct SigninRequest {
   #[prost(string, tag = "1")]
-  pub site_url: ::prost::alloc::string::String,
-  #[prost(string, tag = "2")]
   pub username: ::prost::alloc::string::String,
-  #[prost(string, tag = "3")]
+  #[prost(string, tag = "2")]
   pub password: ::prost::alloc::string::String,
-  #[prost(string, tag = "4")]
+  #[prost(string, tag = "3")]
   pub security_code: ::prost::alloc::string::String,
 }
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/src/c2se/core/mod.rs b/src/c2se/core/mod.rs
new file mode 100644
index 0000000..a61610b
--- /dev/null
+++ b/src/c2se/core/mod.rs
@@ -0,0 +1 @@
+pub mod network;
diff --git a/src/c2se/core/network.rs b/src/c2se/core/network.rs
new file mode 100644
index 0000000..0069248
--- /dev/null
+++ b/src/c2se/core/network.rs
@@ -0,0 +1,3 @@
+const HEADER: &str = "bet.beteran.c2se.core.network";
+
+pub const HEADER_CLIENT: &str = const_format::concatcp!(HEADER, ".Client");
diff --git a/src/c2se/frontend/identity.rs b/src/c2se/frontend/identity.rs
index f14901e..b28902a 100644
--- a/src/c2se/frontend/identity.rs
+++ b/src/c2se/frontend/identity.rs
@@ -2,17 +2,27 @@ use crate::protobuf::rpc;
 
 const SUBJECT: &str = "bet.beteran.c2se.frontend.identity";
 
+pub const SUBJECT_CAPTCHA: &str = const_format::concatcp!(SUBJECT, ".Captcha");
+/// subject = bet.beteran.c2se.frontend.identity.Captcha
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaRequest {}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaResponse {
+  #[prost(message, optional, tag = "1")]
+  pub error: ::core::option::Option<rpc::Error>,
+  #[prost(string, optional, tag = "2")]
+  pub image: ::core::option::Option<::prost::alloc::string::String>,
+}
+
 pub const SUBJECT_SIGNIN: &str = const_format::concatcp!(SUBJECT, ".Signin");
 /// subject = bet.beteran.c2se.frontend.identity.Signin
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct SigninRequest {
   #[prost(string, tag = "1")]
-  pub site_url: ::prost::alloc::string::String,
-  #[prost(string, tag = "2")]
   pub username: ::prost::alloc::string::String,
-  #[prost(string, tag = "3")]
+  #[prost(string, tag = "2")]
   pub password: ::prost::alloc::string::String,
-  #[prost(string, tag = "4")]
+  #[prost(string, tag = "3")]
   pub security_code: ::prost::alloc::string::String,
 }
 #[derive(Clone, PartialEq, ::prost::Message)]
diff --git a/src/c2se/mod.rs b/src/c2se/mod.rs
index d5626ec..5290bd1 100644
--- a/src/c2se/mod.rs
+++ b/src/c2se/mod.rs
@@ -1,8 +1,10 @@
 //!
 //!
 
-///
 ///
 pub mod backend;
 ///
+///
+pub mod core;
+///
 pub mod frontend;
diff --git a/src/models/core/mod.rs b/src/models/core/mod.rs
new file mode 100644
index 0000000..a61610b
--- /dev/null
+++ b/src/models/core/mod.rs
@@ -0,0 +1 @@
+pub mod network;
diff --git a/src/models/core/network.rs b/src/models/core/network.rs
new file mode 100644
index 0000000..96c9abd
--- /dev/null
+++ b/src/models/core/network.rs
@@ -0,0 +1,9 @@
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct Client {
+  #[prost(string, optional, tag = "1")]
+  pub site_url: ::core::option::Option<::prost::alloc::string::String>,
+  #[prost(uint64, tag = "2")]
+  pub client_id: u64,
+  #[prost(string, tag = "3")]
+  pub client_ip: ::prost::alloc::string::String,
+}
diff --git a/src/models/mod.rs b/src/models/mod.rs
index 0dd2a03..f9eb5a6 100644
--- a/src/models/mod.rs
+++ b/src/models/mod.rs
@@ -1 +1,2 @@
+pub mod core;
 pub mod member;
diff --git a/src/ss/member/identity.rs b/src/ss/member/identity.rs
index 61efa1b..ddc52e6 100644
--- a/src/ss/member/identity.rs
+++ b/src/ss/member/identity.rs
@@ -1,13 +1,28 @@
+use crate::models::core;
 use crate::protobuf::rpc;
 
 const SUBJECT: &str = "bet.beteran.ss.member.identity";
 
+/// subject = bet.beteran.ss.member.identity.Captcha
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaRequest {
+  #[prost(message, optional, tag = "1")]
+  pub client: ::core::option::Option<core::network::Client>,
+}
+#[derive(Clone, PartialEq, ::prost::Message)]
+pub struct CaptchaResponse {
+  #[prost(message, optional, tag = "1")]
+  pub error: ::core::option::Option<rpc::Error>,
+  #[prost(string, optional, tag = "2")]
+  pub image: ::core::option::Option<::prost::alloc::string::String>,
+}
+
 pub const SUBJECT_SIGNIN: &str = const_format::concatcp!(SUBJECT, ".Signin");
 /// subject = bet.beteran.ss.member.identity.Signin
 #[derive(Clone, PartialEq, ::prost::Message)]
 pub struct SigninRequest {
-  #[prost(string, tag = "1")]
-  pub site_url: ::prost::alloc::string::String,
+  #[prost(message, optional, tag = "1")]
+  pub client: ::core::option::Option<core::network::Client>,
   #[prost(string, tag = "2")]
   pub username: ::prost::alloc::string::String,
   #[prost(string, tag = "3")]