diff --git a/src/main/java/com/ifmo/epampractice/dao/PassportDao.java b/src/main/java/com/ifmo/epampractice/dao/PassportDao.java
index 5d58838..a995609 100644
--- a/src/main/java/com/ifmo/epampractice/dao/PassportDao.java
+++ b/src/main/java/com/ifmo/epampractice/dao/PassportDao.java
@@ -20,4 +20,5 @@ public interface PassportDao extends BasicDaoInterface<PassportEntity> {
     @Override
     void save(PassportEntity PassportEntity);
 
+    PassportEntity getBySerialNumber(String serialNumber);
 }
diff --git a/src/main/java/com/ifmo/epampractice/daoimpl/PassportDaoImpl.java b/src/main/java/com/ifmo/epampractice/daoimpl/PassportDaoImpl.java
index 74b8178..82ca1d8 100644
--- a/src/main/java/com/ifmo/epampractice/daoimpl/PassportDaoImpl.java
+++ b/src/main/java/com/ifmo/epampractice/daoimpl/PassportDaoImpl.java
@@ -18,6 +18,7 @@ public class PassportDaoImpl implements PassportDao {
     private static final String DELETE_QUERY = "DELETE FROM passport WHERE id = ?";
     private static final String SAVE_QUERY = "INSERT INTO passport (issue_country, issuer, issue_date," +
             " expiration_date, serial_number) VALUES (?, ?, ?, ?, ?)";
+    private static final String GET_BE_SERIAL_NUMBER_QUERY = "SELECT * FROM passport WHERE serial_number = ?";
 
     private static final Logger logger = LogManager.getLogger(CarDaoImpl.class);
 
@@ -97,6 +98,23 @@ public void save(PassportEntity passportEntity) {
 
     }
 
+    @Override
+    public PassportEntity getBySerialNumber(String serialNumber) {
+        try (Connection connection = dbConnector.getConnection();
+             PreparedStatement statement = connection.prepareStatement(GET_BE_SERIAL_NUMBER_QUERY)
+        ) {
+            statement.setString(1, serialNumber);
+            try (ResultSet resultSet = statement.executeQuery()) {
+                if (resultSet.next()) {
+                    return entityFromResultSet(resultSet);
+                }
+            }
+        } catch (SQLException e) {
+            logger.error(e);
+        }
+        return null;
+    }
+
     private PassportEntity entityFromResultSet(ResultSet resultSet) throws SQLException {
         return new PassportEntity(
                 resultSet.getInt("id"),
diff --git a/src/main/java/com/ifmo/epampractice/serviceimpl/PersonalDataServiceImpl.java b/src/main/java/com/ifmo/epampractice/serviceimpl/PersonalDataServiceImpl.java
new file mode 100644
index 0000000..c7ec2e6
--- /dev/null
+++ b/src/main/java/com/ifmo/epampractice/serviceimpl/PersonalDataServiceImpl.java
@@ -0,0 +1,181 @@
+package com.ifmo.epampractice.serviceimpl;
+
+import com.ifmo.epampractice.dao.DrivingLicenseDao;
+import com.ifmo.epampractice.dao.PassportDao;
+import com.ifmo.epampractice.dao.UsersDao;
+import com.ifmo.epampractice.entity.DrivingLicenseEntity;
+import com.ifmo.epampractice.entity.PassportEntity;
+import com.ifmo.epampractice.entity.UsersEntity;
+import com.ifmo.epampractice.services.PasswordHashService;
+import com.ifmo.epampractice.services.PersonalDataService;
+import com.ifmo.epampractice.security.SecureString;
+
+import java.time.LocalDate;
+
+public class PersonalDataServiceImpl implements PersonalDataService {
+
+    private UsersDao usersDao;
+    private PassportDao passportDao;
+    private DrivingLicenseDao drivingLicenseDao;
+    private PasswordHashService passwordHashService;
+
+    public PersonalDataServiceImpl(UsersDao usersDao, PassportDao passportDao, PasswordHashService passwordHashService){
+        this.usersDao = usersDao;
+        this.passportDao = passportDao;
+        this.drivingLicenseDao = drivingLicenseDao;
+        this.passwordHashService = passwordHashService;
+    }
+
+    @Override
+    public PassportEntity changePassport(int userId, String issueCountry, String issuer, LocalDate issueDate,
+                                         LocalDate expirationDate, String serialNumber) {
+        UsersEntity usersEntity = usersDao.get(userId);
+        PassportEntity passportEntity = passportDao.get(usersEntity.getPassId());
+        if (usersEntity == null){
+            throw new RuntimeException();
+        }
+        if (passportEntity == null){
+            return createPassport(usersEntity, issueCountry, issuer, issueDate, expirationDate, serialNumber);
+        }
+        else {
+            return updatePassport(passportEntity, issueCountry, issuer, issueDate, expirationDate, serialNumber);
+        }
+
+
+    }
+
+    @Override
+    public DrivingLicenseEntity changeDrivingLicence(int userId, LocalDate issueDate, LocalDate expirationDate,
+                                                     String serialNumber) {
+
+        UsersEntity usersEntity = usersDao.get(userId);
+        DrivingLicenseEntity drivingLicenseEntity = drivingLicenseDao.get(usersEntity.getDrivingLicenseId());
+        if (usersEntity == null){
+            throw new RuntimeException();
+        }
+        if (drivingLicenseEntity == null){
+            return createDrivingLicense(usersEntity, issueDate, expirationDate, serialNumber);
+        }
+        else {
+            return updateDrivingLicense(drivingLicenseEntity, issueDate, expirationDate, serialNumber);
+        }
+        //need method to validate data
+        //return drivingLicenceEntity
+    }
+
+    @Override
+    public UsersEntity changeUserData(int id, String email, SecureString password, String name,
+                                      String contactPhone, String address) {
+        UsersEntity usersEntity = usersDao.get(id);
+        validateUserData(email, password, name, contactPhone, address);
+        usersEntity.setEmail(email);
+        String passwordHash = passwordHashService.getHash(password);
+        usersEntity.setPasswordHash(passwordHash);
+        usersEntity.setName(name);
+        usersEntity.setContactPhone(contactPhone);
+        usersEntity.setAddress(address);
+        usersDao.update(usersEntity);
+        return usersEntity;
+    }
+
+    private PassportEntity createPassport(UsersEntity usersEntity, String issueCountry, String issuer, LocalDate issueDate,
+                                          LocalDate expirationDate, String serialNumber){
+        validatePassport(issueCountry, issuer, issueDate, expirationDate, serialNumber);
+
+        PassportEntity passportEntity = new PassportEntity(0, issueCountry, issuer, issueDate, expirationDate,
+                serialNumber);
+        passportDao.save(passportEntity);
+        passportEntity = passportDao.getBySerialNumber(passportEntity.getSerialNumber());
+        usersEntity.setPassId(passportEntity.getId());
+        usersDao.update(usersEntity);
+        return passportEntity;
+    }
+    private PassportEntity updatePassport(PassportEntity passportEntity, String issueCountry, String issuer,
+                                          LocalDate issueDate, LocalDate expirationDate, String serialNumber){
+        validatePassport(issueCountry, issuer, issueDate, expirationDate, serialNumber);
+        passportEntity.setIssueCountry(issueCountry);
+        passportEntity.setIssuer(issuer);
+        passportEntity.setIssueDate(issueDate);
+        passportEntity.setExpirationDate(expirationDate);
+        passportEntity.setSerialNumber(serialNumber);
+        passportDao.update(passportEntity);
+        return passportEntity;
+    }
+
+    private DrivingLicenseEntity createDrivingLicense(UsersEntity usersEntity, LocalDate issueDate,
+                                                      LocalDate expirationDate, String serialNumber){
+        validateDrivingLicense(issueDate, expirationDate, serialNumber);
+        DrivingLicenseEntity drivingLicenseEntity = new DrivingLicenseEntity(0, issueDate, expirationDate,
+                serialNumber);
+        drivingLicenseDao.save(drivingLicenseEntity);
+        drivingLicenseEntity = drivingLicenseDao.getBySerialNumber(drivingLicenseEntity.getSerialNumber());
+        usersEntity.setDrivingLicenseId(drivingLicenseEntity.getId());
+        usersDao.update(usersEntity);
+        return drivingLicenseEntity;
+    }
+
+    private DrivingLicenseEntity updateDrivingLicense (DrivingLicenseEntity drivingLicenseEntity, LocalDate issueDate,
+                                                       LocalDate expirationDate, String serialNumber){
+        validateDrivingLicense(issueDate, expirationDate, serialNumber);
+        drivingLicenseEntity.setIssueDate(issueDate);
+        drivingLicenseEntity.setExpirationDate(expirationDate);
+        drivingLicenseEntity.setSerialNumber(serialNumber);
+        drivingLicenseDao.update(drivingLicenseEntity);
+        return drivingLicenseEntity;
+    }
+
+
+    private static final String PHONE_REGEX = "[\\d\\s\\(\\)\\+]+";
+
+    private void validateUserData(String email, SecureString password, String name,
+                               String phone, String address) throws RuntimeException {
+        if (email == null || email.length() == 0) {
+            throw new RuntimeException("Email not specified.");
+        }
+        if (password == null) {
+            throw new RuntimeException("Password is not specified.");
+        }
+        if (name == null || name.length() == 0) {
+            throw new RuntimeException("Name is not specified.");
+        }
+        if (phone == null || phone.length() == 0) {
+            throw new RuntimeException("Phone number is not specified.");
+        }
+        if (!phone.matches(PHONE_REGEX)) {
+            throw new RuntimeException("Phone number may only contain digits, spaces, parentheses and '+' sign.");
+        }
+        if (address == null || address.length() == 0) {
+            throw new RuntimeException("Address is not specified.");
+        }
+    }
+    private void validatePassport (String issueCountry, String issuer, LocalDate issueDate,
+                                   LocalDate expirationDate, String serialNumber) throws RuntimeException {
+        if (issueCountry == null || issueCountry.length() == 0) {
+            throw new RuntimeException("IssueCountry not specified.");
+        }
+        if (issuer == null || issuer.length() == 0) {
+            throw new RuntimeException("Issuer is not specified.");
+        }
+        if (issueDate == null) {
+            throw new RuntimeException("IssueDate date is not specified.");
+        }
+        if (expirationDate == null) {
+            throw new RuntimeException("ExpirationDate date is not specified.");
+        }
+        if (serialNumber == null || serialNumber.length() == 0) {
+            throw new RuntimeException("SerialNumber number is not specified.");
+        }
+    }
+
+    private void  validateDrivingLicense(LocalDate issueDate, LocalDate expirationDate, String serialNumber){
+        if (issueDate == null) {
+            throw new RuntimeException("IssueDate date is not specified.");
+        }
+        if (expirationDate == null) {
+            throw new RuntimeException("ExpirationDate date is not specified.");
+        }
+        if (serialNumber == null || serialNumber.length() == 0) {
+            throw new RuntimeException("SerialNumber number is not specified.");
+        }
+    }
+}
diff --git a/src/main/java/com/ifmo/epampractice/services/PersonalDataService.java b/src/main/java/com/ifmo/epampractice/services/PersonalDataService.java
new file mode 100644
index 0000000..63b4682
--- /dev/null
+++ b/src/main/java/com/ifmo/epampractice/services/PersonalDataService.java
@@ -0,0 +1,18 @@
+package com.ifmo.epampractice.services;
+
+import com.ifmo.epampractice.entity.DrivingLicenseEntity;
+import com.ifmo.epampractice.entity.PassportEntity;
+import com.ifmo.epampractice.entity.UsersEntity;
+import com.ifmo.epampractice.enums.UserRole;
+import com.ifmo.epampractice.security.SecureString;
+
+import java.time.LocalDate;
+
+public interface PersonalDataService {
+    public PassportEntity changePassport (int userId, String issueCountry, String issuer, LocalDate issueDate,
+                                          LocalDate expirationDate, String serialNumber);
+    public DrivingLicenseEntity changeDrivingLicence (int userId, LocalDate issueDate, LocalDate expirationDate,
+                                                      String serialNumber);
+    public UsersEntity changeUserData(int id, String email, SecureString password, String name,
+                                      String contactPhone, String address);
+}