add 25-word architecture summary

1 files changed, 4 insertions, 0 deletions

diff --git a/index.mdwn b/index.mdwn
index 9192964..5b7360a 100644
--- a/index.mdwn
+++ b/index.mdwn
@@ -11,6 +11,10 @@ retired in 2017. All that content has been dropped now.
 Obnam2 acceptance criteria are documented using [Subplot][], and are
 on [docs.obnam.org](https://doc.obnam.org/).
 
+**25-word summary of the new architcture:** client splits live data
+into chunks, then compresses and encrypts them, and uploads new ones
+to smart server via HTTP; server never sees cleartext.
+
 [Subplot]: https://subplot.liw.fi/
 
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