====== Authentication ======

===== Principles =====

Just a hash challenge (actually using [[https://en.wikipedia.org/wiki/Whirlpool_(cryptography)|Whirlpool]]) to resolve for masters in order to authenticate themselves, using a symmetric key, that needs to be sent to slaves.

===== Key storage/auth methods =====

Plugins on master side can be made to store and do the hash in an other way than plain raw key storage on the master's filesystem.

==== Arduino/EEPROM method ====

===== Permissions =====

===== Key sending procedure =====

Log on the slave side :\\
{{:xifnet:ioslaves:screenshot_2016-08-29_a_02.40.24.png?direct|}}

Log of the master which stores and sends its key to the slave :\\
{{:xifnet:ioslaves:key-master-sending.png?direct|}}

Log of the master which authorizes the first master to send the key, and chooses associated permissions :\\
{{:xifnet:ioslaves:key-master-auth.png?direct|}}

Logs of initial key sending (accepting the first key without being authenticated) :\\
{{:xifnet:ioslaves:initial-key-sending.png?direct|}}