+
+In @ref{Encless, encryptionless mode} this scheme is slightly different:
+
+@verbatim
+ PACKET = ENCODED || NONCE
+ENCODED = ENCLESS(DATA || PAD || ZEROS)
+ NONCE = PRP(PRP_KEY, SERIAL)
+@end verbatim
+
+@code{ENCLESS} is AONT and chaffing function. There is no need in
+explicit separate authentication.