diff --git a/backend/auth/otp/verify.php b/backend/auth/otp/verify.php
index a6d5b82..f11625f 100644
--- a/backend/auth/otp/verify.php
+++ b/backend/auth/otp/verify.php
@@ -177,8 +177,10 @@ try {
                 $isRegistered = false;
                 $driverData = null;
                 
-                $chkStmt = $con->prepare("SELECT id, first_name, last_name, email, phone FROM driver WHERE phone = ?");
-                $chkStmt->execute([$encryptionHelper->encryptData($phone_number)]);
+                global $blindIndex;
+                $phoneBidx = $blindIndex ? $blindIndex->index('driver.phone', $phone_number) : null;
+                $chkStmt = $con->prepare("SELECT id, first_name, last_name, email, phone FROM driver WHERE phone = ? OR (? IS NOT NULL AND phone_bidx = ?)");
+                $chkStmt->execute([$encryptionHelper->encryptData($phone_number), $phoneBidx, $phoneBidx]);
                 $driver = $chkStmt->fetch(PDO::FETCH_ASSOC);
                 
                 // Generate driverID for unregistered users (hash of phone)
@@ -268,13 +270,14 @@ try {
                 $stmtUpd->bindParam(':id', $matchedRowId, PDO::PARAM_INT);
                 $stmtUpd->execute();
                 
-                // Check registration status
                 $isRegistered = false;
                 $passengerData = null;
                 $passengerID = '';
                 
-                $chkStmt = $con->prepare("SELECT id, first_name, last_name, email, phone FROM passengers WHERE phone = ?");
-                $chkStmt->execute([$encryptionHelper->encryptData($phone_number)]);
+                global $blindIndex;
+                $phoneBidx = $blindIndex ? $blindIndex->index('passengers.phone', $phone_number) : null;
+                $chkStmt = $con->prepare("SELECT id, first_name, last_name, email, phone FROM passengers WHERE phone = ? OR (? IS NOT NULL AND phone_bidx = ?)");
+                $chkStmt->execute([$encryptionHelper->encryptData($phone_number), $phoneBidx, $phoneBidx]);
                 $passenger = $chkStmt->fetch(PDO::FETCH_ASSOC);
                 
                 if ($passenger) {