Is File Upload class creates unique file name when encrypt_name set true?

Is File Uploading class in code ignter creates unique file name when encrypt_name set true?

       

PHP Code:

$config['upload_path'] = $abs_path;    
        $config['allowed_types'] = 'doc|docx|pdf';
        $config['max_size'] = '5120';
        $config['remove_spaces'] = TRUE;        
        $config['encrypt_name'] = TRUE;
        $this->load->library('upload', $config); 


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