diff --git a/internal/accounts/api/controller.go b/internal/accounts/api/controller.go
index 11b7522..1a246f1 100644
--- a/internal/accounts/api/controller.go
+++ b/internal/accounts/api/controller.go
@@ -19,7 +19,7 @@ func NewController(service domain.AccountService) Controller {
 	return Controller{service: service}
 }
 
-func (c *Controller) Login(w *core.Response, r *http.Request) {
+func (c Controller) Login(w *core.Response, r *http.Request) {
 	var request LoginAccountRequest
 	if err := json.NewDecoder(r.Body).Decode(&request); err != nil {
 		w.WriteError(core.ErrInvalidStruct)
@@ -30,4 +30,5 @@ func (c *Controller) Login(w *core.Response, r *http.Request) {
 		w.WriteError(core.ErrInvalidStruct)
 		return
 	}
+
 }
diff --git a/internal/accounts/domain/account.go b/internal/accounts/domain/account.go
index 6f9d139..d4209c7 100644
--- a/internal/accounts/domain/account.go
+++ b/internal/accounts/domain/account.go
@@ -8,3 +8,14 @@ type Account struct {
 	CreatedAt string `db:"created_at" json:"created_at"`
 	UpdatedAt string `db:"updated_at" json:"updated_at"`
 }
+
+type AccountLogin struct {
+	Username string
+	Password string
+}
+
+type AccountCreate struct {
+	Username string
+	Password string
+	RoleId   int
+}
diff --git a/internal/accounts/domain/repository.go b/internal/accounts/domain/repository.go
index 1bf6b12..72210eb 100644
--- a/internal/accounts/domain/repository.go
+++ b/internal/accounts/domain/repository.go
@@ -1,6 +1,6 @@
 package domain
 
 type AccountRepository interface {
-	Insert(account *Account) (int, error)
+	Insert(account Account) (int, error)
 	FetchOneByUsername(username string) (*Account, error)
 }
diff --git a/internal/accounts/domain/service.go b/internal/accounts/domain/service.go
index 8baaca8..7cc23a9 100644
--- a/internal/accounts/domain/service.go
+++ b/internal/accounts/domain/service.go
@@ -1,4 +1,7 @@
 package domain
 
+import "gitea.qpismont.fr/qpismont/trepa/internal/core"
+
 type AccountService interface {
+	Login(login AccountLogin) (*Account, *core.HTTPError)
 }
diff --git a/internal/accounts/repository/account.go b/internal/accounts/repository/account.go
index 5c6f42c..17caafb 100644
--- a/internal/accounts/repository/account.go
+++ b/internal/accounts/repository/account.go
@@ -15,7 +15,7 @@ func NewRepository(db *sqlx.DB) domain.AccountRepository {
 	return &Repository{db: db}
 }
 
-func (r *Repository) Insert(account *domain.Account) (int, error) {
+func (r *Repository) Insert(account domain.Account) (int, error) {
 	var id int
 
 	stmt, err := r.db.Prepare(SqlInsert)
diff --git a/internal/accounts/repository/account_test.go b/internal/accounts/repository/account_test.go
index 0e56437..e1aaf7b 100644
--- a/internal/accounts/repository/account_test.go
+++ b/internal/accounts/repository/account_test.go
@@ -14,7 +14,7 @@ func TestRepository_Insert(t *testing.T) {
 
 	repo := NewRepository(db)
 
-	account := &domain.Account{
+	account := domain.Account{
 		Username: "test",
 		Password: "test",
 		RoleId:   1,
diff --git a/internal/accounts/service/account.go b/internal/accounts/service/account.go
index 8cca60c..9925549 100644
--- a/internal/accounts/service/account.go
+++ b/internal/accounts/service/account.go
@@ -1,6 +1,9 @@
 package service
 
-import "gitea.qpismont.fr/qpismont/trepa/internal/accounts/domain"
+import (
+	"gitea.qpismont.fr/qpismont/trepa/internal/accounts/domain"
+	"gitea.qpismont.fr/qpismont/trepa/internal/core"
+)
 
 type Service struct {
 	repository domain.AccountRepository
@@ -9,3 +12,16 @@ type Service struct {
 func NewService(repository domain.AccountRepository) domain.AccountService {
 	return &Service{repository: repository}
 }
+
+func (s *Service) Login(login domain.AccountLogin) (*domain.Account, *core.HTTPError) {
+	account, err := s.repository.FetchOneByUsername(login.Username)
+	if err != nil {
+		return nil, domain.ErrAccountNotFound
+	}
+
+	if !core.ComparePassword(login.Password, account.Password) {
+		return nil, domain.ErrBadPassword
+	}
+
+	return account, nil
+}
diff --git a/internal/core/helpers.go b/internal/core/env.go
similarity index 100%
rename from internal/core/helpers.go
rename to internal/core/env.go
diff --git a/internal/core/helpers_test.go b/internal/core/env_test.go
similarity index 100%
rename from internal/core/helpers_test.go
rename to internal/core/env_test.go
diff --git a/internal/core/hash.go b/internal/core/hash.go
new file mode 100644
index 0000000..f5cb3e6
--- /dev/null
+++ b/internal/core/hash.go
@@ -0,0 +1,12 @@
+package core
+
+import "golang.org/x/crypto/argon2"
+
+func HashPassword(password string) string {
+	return string(argon2.IDKey([]byte(password), nil, 1, 64*1024, 4, 32))
+}
+
+func ComparePassword(password string, hash string) bool {
+	hashedPassword := HashPassword(password)
+	return hashedPassword == hash
+}
diff --git a/internal/core/hash_test.go b/internal/core/hash_test.go
new file mode 100644
index 0000000..ff194d1
--- /dev/null
+++ b/internal/core/hash_test.go
@@ -0,0 +1,21 @@
+package core
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestHashPassword(t *testing.T) {
+	password := "password"
+	hashedPassword := HashPassword(password)
+	assert.NotEmpty(t, hashedPassword)
+	t.Log(hashedPassword)
+	assert.Equal(t, hashedPassword, "LOLPASSWORD")
+}
+
+func TestComparePassword(t *testing.T) {
+	password := "password"
+	hashedPassword := HashPassword(password)
+	assert.True(t, ComparePassword(password, hashedPassword))
+}