US Patent 12063203 Authentication procedure in a virtual private network

A method including receiving, by a first server from a second server, an encrypted authentication packet to enable the first server and the second server to conduct an authentication process, the encrypted authentication packet including a crypted code field indicating that a portion of the encrypted authentication packet is encrypted and a crypted payload including an encrypted initial authentication packet; and transmitting, by the first server to the second server, a response based at least in part on determining that the portion of the encrypted authentication packet is encrypted and on decrypting the encrypted initial authentication packet. Various other aspects are contemplated.