--- /dev/null
+@node enACPKM
+@section External/internal rekeying mechanisms
+
+@table @asis
+@item Algorithm type
+ Rekeying mechanisms for symmetric keys
+@item RFC
+ @url{https://tools.ietf.org/html/rfc8645, 8645}
+@item Standard
+ @url{https://tc26.ru/standarts/rekomendatsii-po-standartizatsii/r-1323565-1-017-2018-informatsionnaya-tekhnologiya-kriptograficheskaya-zashchita-informatsii-kriptograficheskie-algoritmy-soputstvuyushchie-primeneniyu-algoritmov-blochnogo-shifrovaniya.html, Р 1323565.1.017-2018}
+@end table
+
+@strong{Features}: this RFC describes parallel and serial block-cipher,
+hash-function and tree-based "external" rekeying methods and also
+"internal" ACPKM (Advanced Cryptographic Prolongation of Key Material)
+method.