[gnutls-devel] GnuTLS | Update docs for session ticket key rotation (!768)

Development of GNU's TLS library gnutls-devel at lists.gnutls.org
Thu Oct 11 21:31:56 CEST 2018

Nikos Mavrogiannopoulos commented on a discussion on doc/cha-gtls-app.texi:

>  A server supporting session tickets must generate ticket encryption
>  and authentication keys using @funcref{gnutls_session_ticket_key_generate}.
>  Those keys should be associated with the GnuTLS session using
> - at funcref{gnutls_session_ticket_enable_server}, and should be rotated regularly
> -(e.g., every few hours), to prevent them from becoming long-term keys which
> -if revealed could be used to decrypt all previous sessions.
> + at funcref{gnutls_session_ticket_enable_server}.
> +
> +GnuTLS will rotate these keys regularly. The key rotation interval can be specified with
> + at funcref{gnutls_db_set_cache_expiration}. Every such interval, new keys will be generated from the initial keys
> +that were first established using @funcref{gnutls_session_ticket_enable_server}. This is

LGTM. I'd avoid saying twice the `The key rotation interval` in the 2nd and third sentence, and connect them instead. E.g
The key rotation interval can be changed with @funcref{gnutls_db_set_cache_expiration} and will be
three times the ticket expiration time (ie. three times the value given in that function).

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