diff --git a/services/identity/src/database.rs b/services/identity/src/database.rs
--- a/services/identity/src/database.rs
+++ b/services/identity/src/database.rs
@@ -102,6 +102,7 @@
     signing_public_key: Option<String>,
     registration: Option<ServerRegistration<Cipher>>,
     username: Option<String>,
+    session_initialization_info: Option<&HashMap<String, String>>,
   ) -> Result<UpdateItemOutput, Error> {
     let mut update_expression_parts = Vec::new();
     let mut expression_attribute_names = HashMap::new();
@@ -129,8 +130,15 @@
         format!("#{}", USERS_TABLE_DEVICES_MAP_ATTRIBUTE_NAME),
         public_key,
       );
+      let device_info = match session_initialization_info {
+        Some(info) => info
+          .iter()
+          .map(|(k, v)| (k.to_string(), AttributeValue::S(v.to_string())))
+          .collect(),
+        None => HashMap::new(),
+      };
       expression_attribute_values
-        .insert(":k".to_string(), AttributeValue::M(HashMap::new()));
+        .insert(":k".to_string(), AttributeValue::M(device_info));
     };
 
     self
@@ -164,7 +172,14 @@
     registration: ServerRegistration<Cipher>,
     username: String,
     signing_public_key: String,
+    session_initialization_info: &HashMap<String, String>,
   ) -> Result<PutItemOutput, Error> {
+    let device_info: HashMap<String, AttributeValue> =
+      session_initialization_info
+        .iter()
+        .map(|(k, v)| (k.to_string(), AttributeValue::S(v.to_string())))
+        .collect();
+
     let item = HashMap::from([
       (
         USERS_TABLE_PARTITION_KEY.to_string(),
@@ -182,7 +197,7 @@
         USERS_TABLE_DEVICES_ATTRIBUTE.to_string(),
         AttributeValue::M(HashMap::from([(
           signing_public_key,
-          AttributeValue::M(HashMap::new()),
+          AttributeValue::M(device_info),
         )])),
       ),
     ]);
diff --git a/services/identity/src/service.rs b/services/identity/src/service.rs
--- a/services/identity/src/service.rs
+++ b/services/identity/src/service.rs
@@ -386,6 +386,12 @@
       Some(wallet_login_request.signing_public_key.clone()),
       None,
       None,
+      Some(
+        &wallet_login_request
+          .session_initialization_info
+          .ok_or_else(|| Status::invalid_argument("Invalid message"))?
+          .info,
+      ),
     )
     .await
     .map_err(handle_db_error)?;
@@ -461,6 +467,7 @@
   pake_credential_finalization: &[u8],
   rng: &mut (impl Rng + CryptoRng),
   pake_workflow: PakeWorkflow,
+  session_initialization_info: &HashMap<String, String>,
 ) -> Result<PakeLoginResponseStruct, Status> {
   if user_id.is_empty() || signing_public_key.is_empty() {
     error!(
@@ -491,6 +498,7 @@
         Some(signing_public_key.to_string()),
         None,
         None,
+        Some(session_initialization_info),
       )
       .await
       .map_err(handle_db_error)?;
@@ -545,6 +553,7 @@
   server_registration: Option<ServerRegistration<Cipher>>,
   username: &str,
   signing_public_key: &str,
+  session_initialization_info: &HashMap<String, String>,
 ) -> Result<(), Status> {
   if user_id.is_empty() {
     error!("Incomplete data: user ID not provided");
@@ -574,6 +583,7 @@
       server_registration_finish_result,
       username.to_string(),
       signing_public_key.to_string(),
+      session_initialization_info,
     )
     .await
   {
diff --git a/services/identity/src/service/login.rs b/services/identity/src/service/login.rs
--- a/services/identity/src/service/login.rs
+++ b/services/identity/src/service/login.rs
@@ -3,6 +3,7 @@
   user_id: String,
   signing_public_key: String,
   pake_state: ServerLogin<Cipher>,
+  session_initialization_info: HashMap<String, String>,
 }
 pub async fn handle_login_request(
   message: Option<Result<LoginRequest, Status>>,
@@ -50,6 +51,10 @@
         signing_public_key: pake_credential_request_and_user_id
           .signing_public_key,
         pake_state: response_and_state.pake_state,
+        session_initialization_info: pake_credential_request_and_user_id
+          .session_initialization_info
+          .ok_or_else(|| Status::invalid_argument("Invalid message"))?
+          .info,
       }))
     }
     Some(_) | None => Err(Status::aborted("failure")),
@@ -77,6 +82,7 @@
         &pake_credential_finalization,
         &mut OsRng,
         PakeWorkflow::Login,
+        &login_state.session_initialization_info,
       )
       .await
       .map(|pake_login_response| LoginResponse {
diff --git a/services/identity/src/service/registration.rs b/services/identity/src/service/registration.rs
--- a/services/identity/src/service/registration.rs
+++ b/services/identity/src/service/registration.rs
@@ -4,6 +4,7 @@
   username: String,
   signing_public_key: String,
   pub pake_state: Option<ServerRegistration<Cipher>>,
+  session_initialization_info: HashMap<String, String>,
 }
 
 pub async fn handle_registration_request(
@@ -51,6 +52,10 @@
         signing_public_key: pake_registration_request_and_user_id
           .signing_public_key,
         pake_state: Some(response_and_state.pake_state),
+        session_initialization_info: pake_registration_request_and_user_id
+          .session_initialization_info
+          .ok_or_else(|| Status::invalid_argument("Invalid message"))?
+          .info,
       })
     }
     None | Some(_) => Err(Status::aborted("failure")),
@@ -79,6 +84,7 @@
         Some(pake_state),
         &registration_state.username,
         &registration_state.signing_public_key,
+        &registration_state.session_initialization_info,
       )
       .await
       {
@@ -130,6 +136,7 @@
         &pake_credential_finalization,
         &mut OsRng,
         PakeWorkflow::Registration,
+        &registration_state.session_initialization_info,
       )
       .await
       .map(|pake_login_response| RegistrationResponse {
diff --git a/shared/protos/identity.proto b/shared/protos/identity.proto
--- a/shared/protos/identity.proto
+++ b/shared/protos/identity.proto
@@ -37,6 +37,9 @@
   // Message sent to initiate PAKE registration (step 1)
   bytes pakeRegistrationRequest = 3;
   string username = 4;
+  // Information specific to a user's device needed to open a new channel of
+  // communication with this user
+  SessionInitializationInfo sessionInitializationInfo = 5;
 }
 
 message PakeCredentialRequestAndUserID {
@@ -45,6 +48,9 @@
   string signingPublicKey = 2;
   // Message sent to initiate PAKE login (step 1)
   bytes pakeCredentialRequest = 3;
+  // Information specific to a user's device needed to open a new channel of
+  // communication with this user
+  SessionInitializationInfo sessionInitializationInfo = 4;
 }
 
 message PakeLoginRequest {
@@ -79,6 +85,9 @@
   string signingPublicKey = 2;
   string siweMessage = 3;
   bytes siweSignature = 4;
+  // Information specific to a user's device needed to open a new channel of
+  // communication with this user
+  SessionInitializationInfo sessionInitializationInfo = 5;
 }
 
 message WalletLoginResponse {