US Patent 12021838 Authentication procedure in a virtual private network

A method including determining, by a first server, an encrypted authentication packet, the determining including, determining a crypted code field to indicate a type associated with the encryption authentication packet and that at least a portion of the encryption authentication packet is encrypted, and determining a crypted payload based at least in part on encrypting an initial authentication packet. The method may also include transmitting, by the first server to a second server, the encrypted authentication packet to enable the first server and the second server to conduct an authentication process. Various other aspects are contemplated.