diff --git a/api/src/lib.rs b/api/src/lib.rs
index 1a066a6..33136ec 100644
--- a/api/src/lib.rs
+++ b/api/src/lib.rs
@@ -5,7 +5,7 @@ use std::net::SocketAddr;
 
 use portfolio_core::error::ServiceError;
 use portfolio_core::services::candidate_service::CandidateService;
-use requests::LoginRequest;
+use requests::{LoginRequest, RegisterRequest};
 use rocket::http::Status;
 use rocket::{Rocket, Build};
 use rocket::serde::json::Json;
@@ -35,13 +35,13 @@ fn custom_err_from_service_err(service_err: ServiceError) -> Custom<String> {
 }
 
 #[post("/", data = "<post_form>")]
-async fn create(conn: Connection<'_, Db>, post_form: Json<candidate::Model>) -> Result<String, Custom<String>> {   
+async fn create(conn: Connection<'_, Db>, post_form: Json<RegisterRequest>) -> Result<String, Custom<String>> {   
     let db = conn.into_inner();
     let form = post_form.into_inner();
 
     let plain_text_password = random_8_char_string();
 
-    Mutation::create_candidate(db, form, &plain_text_password)
+    Mutation::create_candidate(db, form.application_id, &plain_text_password, form.personal_id_number)
         .await
         .expect("Could not insert candidate");
 
diff --git a/api/src/requests.rs b/api/src/requests.rs
index 9c86d49..032af26 100644
--- a/api/src/requests.rs
+++ b/api/src/requests.rs
@@ -6,4 +6,11 @@ use rocket::serde::{Serialize, Deserialize};
 pub struct LoginRequest {
     pub application_id: i32,
     pub password: String,
+}
+
+#[derive(Serialize, Deserialize)]
+#[serde(crate = "rocket::serde")]
+pub struct RegisterRequest {
+    pub application_id: i32,
+    pub personal_id_number: String,
 }
\ No newline at end of file
diff --git a/core/Cargo.toml b/core/Cargo.toml
index 22a29bc..db5c1bd 100644
--- a/core/Cargo.toml
+++ b/core/Cargo.toml
@@ -7,10 +7,6 @@ publish = false
 [dependencies]
 chrono = "^0.4"
 
-# serialization & deserialization
-serde = { version = "^1.0", features = ["derive"] }
-serde_json = "^1.0"
-
 portfolio-entity = { path = "../entity" }
 
 # env
diff --git a/core/src/mutation.rs b/core/src/mutation.rs
index d127342..ba914fa 100644
--- a/core/src/mutation.rs
+++ b/core/src/mutation.rs
@@ -1,3 +1,5 @@
+use std::vec;
+
 use chrono::{Utc, Duration};
 use ::entity::{candidate, session};
 use sea_orm::{*, prelude::Uuid};
@@ -8,17 +10,23 @@ pub struct Mutation;
 impl Mutation {
     pub async fn create_candidate(
         db: &DbConn,
-        form_data: candidate::Model,
+        application_id: i32,
         plain_text_password: &String,
+        personal_id_number: String,
     ) -> Result<candidate::Model, DbErr> {
         // TODO: unwrap pro testing..
         let hashed_password = hash_password(plain_text_password.to_string()).await.unwrap();
         let (pubkey, priv_key_plain_text) = crypto::create_identity();
-        let encrypted_priv_key = crypto::encrypt_password_age(&priv_key_plain_text, &plain_text_password.to_string()).await.unwrap();
+        let encrypted_priv_key = crypto::encrypt_password(priv_key_plain_text, plain_text_password.to_string()).await.unwrap();
+
+        let encrypted_personal_id_number = crypto::encrypt_password_with_recipients(
+            &personal_id_number, vec![&pubkey]
+        ).await.unwrap();
 
 
         candidate::ActiveModel {
-            application: Set(form_data.application),
+            application: Set(application_id),
+            personal_identification_number: Set(encrypted_personal_id_number),
             code: Set(hashed_password),
             public_key: Set(pubkey),
             private_key: Set(encrypted_priv_key),
@@ -65,7 +73,6 @@ impl Mutation {
 #[cfg(test)]
 mod tests {
     use sea_orm::{Database, DbConn};
-    use serde_json::json;
 
     use crate::{Mutation, crypto};
 
@@ -89,19 +96,16 @@ mod tests {
     async fn test_encrypt_decrypt_private_key_with_passphrase() {
         let db = get_memory_sqlite_connection().await;
 
-        let form = serde_json::from_value(json!({
-            "application": 5555555,
-        })).unwrap();
         let plain_text_password = "test".to_string();
 
         let secret_message = "trnka".to_string();
 
         
-        let candidate = Mutation::create_candidate(&db, form, &plain_text_password).await.unwrap();
+        let candidate = Mutation::create_candidate(&db, 5555555, &plain_text_password, "".to_string()).await.unwrap();
 
         let encrypted_message = crypto::encrypt_password_with_recipients(&secret_message, vec![&candidate.public_key]).await.unwrap();
 
-        let private_key_plain_text = crypto::decrypt_password_age(&candidate.private_key, &plain_text_password).await.unwrap();
+        let private_key_plain_text = crypto::decrypt_password(candidate.private_key, plain_text_password).await.unwrap();
 
         let decrypted_message = crypto::decrypt_password_with_private_key(&encrypted_message, &private_key_plain_text).await.unwrap();
 
diff --git a/core/src/query.rs b/core/src/query.rs
index 35f0883..0c0c440 100644
--- a/core/src/query.rs
+++ b/core/src/query.rs
@@ -50,6 +50,7 @@ mod tests {
             code: Set("test".to_string()),
             public_key: Set("test".to_string()),
             private_key: Set("test".to_string()),
+            personal_identification_number: Set("test".to_string()),
             created_at: Set(chrono::offset::Local::now().naive_local()),
             updated_at: Set(chrono::offset::Local::now().naive_local()),
             ..Default::default()
diff --git a/core/src/services/candidate_service.rs b/core/src/services/candidate_service.rs
index 73486e7..91bdd83 100644
--- a/core/src/services/candidate_service.rs
+++ b/core/src/services/candidate_service.rs
@@ -92,7 +92,6 @@ impl CandidateService {
 mod tests {
     use entity::candidate;
     use sea_orm::{DbConn, Database, sea_query::TableCreateStatement, DbBackend, Schema, ConnectionTrait, prelude::Uuid};
-    use serde_json::json;
 
     use crate::{crypto, Mutation, services::candidate_service::CandidateService};
 
@@ -117,11 +116,7 @@ mod tests {
 
         let db = get_memory_sqlite_connection().await;
     
-        let form = serde_json::from_value(json!({
-                "application": 5555555,
-            })).unwrap();
-    
-        let candidate = Mutation::create_candidate(&db, form, &SECRET.to_string()).await.unwrap();
+        let candidate = Mutation::create_candidate(&db, 5555555, &SECRET.to_string(), "".to_string()).await.unwrap();
     
         assert_eq!(candidate.application, 5555555);
         assert_ne!(candidate.code, SECRET.to_string());
@@ -132,11 +127,7 @@ mod tests {
     async fn test_candidate_session_correct_password() {
         let db = &get_memory_sqlite_connection().await;
 
-        let form = serde_json::from_value(json!({
-            "application": 5555555,
-        })).unwrap();
-
-        Mutation::create_candidate(&db, form, &"Tajny_kod".to_string()).await.unwrap();
+        Mutation::create_candidate(&db, 5555555, &"Tajny_kod".to_string(), "".to_string()).await.unwrap();
 
         // correct password
         let session = CandidateService::new_session(
@@ -159,11 +150,7 @@ mod tests {
     async fn test_candidate_session_incorrect_password() {
         let db = &get_memory_sqlite_connection().await;
 
-        let form = serde_json::from_value(json!({
-            "application": 5555555,
-        })).unwrap();
-
-        let candidate_form = Mutation::create_candidate(&db, form, &"Tajny_kod".to_string()).await.unwrap();
+        let candidate_form = Mutation::create_candidate(&db, 5555555, &"Tajny_kod".to_string(), "".to_string()).await.unwrap();
 
          // incorrect password
          assert!(
diff --git a/entity/Cargo.toml b/entity/Cargo.toml
index 1b3a166..af3e744 100644
--- a/entity/Cargo.toml
+++ b/entity/Cargo.toml
@@ -9,7 +9,6 @@ name = "entity"
 path = "src/lib.rs"
 
 [dependencies]
-serde = { version = "^1.0", features = ["derive"] }
 chrono = "^0.4"
 
 [dependencies.sea-orm]
diff --git a/entity/src/candidate.rs b/entity/src/candidate.rs
index 221a80e..4861e7c 100644
--- a/entity/src/candidate.rs
+++ b/entity/src/candidate.rs
@@ -1,13 +1,10 @@
 use sea_orm::entity::prelude::*;
-use serde::{Deserialize, Serialize};
 
-
-#[derive(Clone, Debug, PartialEq, DeriveEntityModel, Eq, Serialize, Deserialize)]
+#[derive(Clone, Debug, PartialEq, DeriveEntityModel)]
 #[sea_orm(table_name = "candidate")]
 pub struct Model {
     #[sea_orm(primary_key, auto_increment = false)]
     pub application: i32,
-    #[serde(skip_deserializing, skip_serializing)]
     pub code: String,
     pub name: Option<String>,
     pub surname: Option<String>,
@@ -20,16 +17,12 @@ pub struct Model {
     pub email: Option<String>,
     pub sex: Option<String>,
     pub study: Option<String>,
-    pub personal_identification_number: Option<String>,
+    pub personal_identification_number: String,
     #[sea_orm(column_type = "Text", nullable)]
     pub personal_identification_number_hash: Option<String>,
-    #[serde(skip_deserializing, skip_serializing)]
     pub public_key: String,
-    #[serde(skip_deserializing, skip_serializing)]
     pub private_key: String,
-    #[serde(skip_deserializing, skip_serializing)]
     pub created_at: DateTime,
-    #[serde(skip_deserializing, skip_serializing)]
     pub updated_at: DateTime,
 }
 
diff --git a/migration/src/m20221024_121621_create_candidate.rs b/migration/src/m20221024_121621_create_candidate.rs
index 929838b..5483c3a 100644
--- a/migration/src/m20221024_121621_create_candidate.rs
+++ b/migration/src/m20221024_121621_create_candidate.rs
@@ -30,7 +30,7 @@ impl MigrationTrait for Migration {
                     .col(ColumnDef::new(Candidate::Email).string())
                     .col(ColumnDef::new(Candidate::Sex).string())
                     .col(ColumnDef::new(Candidate::Study).string())
-                    .col(ColumnDef::new(Candidate::PersonalIdentificationNumber).string())
+                    .col(ColumnDef::new(Candidate::PersonalIdentificationNumber).string().not_null())
                     .col(ColumnDef::new(Candidate::PersonalIdentificationNumberHash).text())
                     .col(ColumnDef::new(Candidate::PublicKey).string().not_null())
                     .col(ColumnDef::new(Candidate::PrivateKey).string().not_null())
diff --git a/migration/src/main.rs b/migration/src/main.rs
index f054dea..85be8cc 100644
--- a/migration/src/main.rs
+++ b/migration/src/main.rs
@@ -3,4 +3,4 @@ use sea_orm_migration::prelude::*;
 #[tokio::main]
 async fn main() {
     cli::run_cli(migration::Migrator).await;
-}
+}
\ No newline at end of file