The following protocols have not been modelled for use in Scyther:

- CAM http://www.lsv.ens-cachan.fr/spore/cam.html
This protocol only consists of one message and corresponding database actions.
The description given in SPORE is unsuitable for formalisation.

- Diffie Helman http://www.lsv.ens-cachan.fr/spore/diffieHelman.html
This protocol relies on algebraic properties that can not be modelled in
scyther.

- GJM http://www.lsv.ens-cachan.fr/spore/gjm.html
This protocol contains complicated if-then-else constructions that can
not be modelled in scyther.

- Gong http://www.lsv.ens-cachan.fr/spore/gong.html
This protocol relies on algebraic properties that can not be modelled in
scyther.

- SK3
This protocol relies on algebraic properties that can not be modelled in
scyther. It also has the notion of channels that can not be attacked,
which can not be modelled in scyther either.