diff --git a/src/be/jeffcheasey88/peeratcode/repository/DatabaseRepo.java b/src/be/jeffcheasey88/peeratcode/repository/DatabaseRepo.java
index c539641..cf2a2a0 100644
--- a/src/be/jeffcheasey88/peeratcode/repository/DatabaseRepo.java
+++ b/src/be/jeffcheasey88/peeratcode/repository/DatabaseRepo.java
@@ -110,4 +110,91 @@ public class DatabaseRepo {
 		}
 		return null;
 	}
+
+	/**
+	 * Check if a pseudo is available
+	 *
+	 * @param pseudo The pseudo to check
+	 * @return True if the pseudo is available, false if it's already taken
+	 */
+	public boolean checkPseudoAvailability(String pseudo) {
+		return checkAvailability(pseudo, CHECK_PSEUDO_AVAILABLE_QUERY);
+	}
+
+	/**
+	 * Check if an email is available
+	 *
+	 * @param email The email to check
+	 * @return True if the email is available, false if it's already taken
+	 */
+	public boolean checkEmailAvailability(String email) {
+		return checkAvailability(email, CHECK_EMAIL_AVAILABLE_QUERY);
+	}
+
+	private boolean checkAvailability(String queriedString, String correspondingQuery) {
+		try {
+			PreparedStatement statement = con.prepareStatement(correspondingQuery);
+			statement.setString(1, queriedString);
+			ResultSet result = statement.executeQuery();
+			return !result.next();
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return false;
+	}
+
+	/**
+	 * Register a new user
+	 *
+	 * @param pseudo      The pseudo of the user
+	 * @param email       The email of the user
+	 * @param password    The password of the user
+	 * @param firstname   The firstname of the user
+	 * @param lastname    The lastname of the user
+	 * @param description The description of the user
+	 * @param group       The group of the user
+	 * @param avatar      The avatar of the user
+	 * @return True if the user was registered, false if an error occurred
+	 */
+	public boolean register(String pseudo, String email, String password, String firstname, String lastname, String description, String group, String avatar) {
+		Hash hash = Password.hash(password).withArgon2();
+		try {
+			PreparedStatement statement = con.prepareStatement(REGISTER_QUERY);
+			statement.setString(1, pseudo);
+			statement.setString(2, email);
+			statement.setString(3, hash.toString());
+			statement.setString(4, firstname);
+			statement.setString(5, lastname);
+			statement.setString(6, description);
+			statement.setString(7, group);
+			statement.setString(8, avatar);
+			return statement.executeUpdate() == 1;
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return false;
+	}
+
+	/**
+	 * Login a user
+	 *
+	 * @param email    The email of the user
+	 * @param password The password of the user
+	 * @return True if the user's information are correct, false otherwise (or if an error occurred)
+	 */
+	public boolean login(String email, String password) {
+		try {
+			PreparedStatement statement = con.prepareStatement(PASSWORD_FOR_EMAIL_QUERY);
+			statement.setString(1, email);
+			statement.setString(2, password);
+			ResultSet result = statement.executeQuery();
+			if (result.next()) {
+				String hashedPassword = result.getString("passwd");
+				return Password.check(password, hashedPassword).withArgon2();
+			}
+		} catch (SQLException e) {
+			e.printStackTrace();
+		}
+		return false;
+	}
 }
\ No newline at end of file