Tpm2.0 tss (software stack) consists of api layers provided to support tpm 2.0 chips. it is made out of three layers:

- system api (sapi), which implements the system layer api;
- tpm command transmission interface (tcti), which is used by sapi to
allow communication with the tab/rm layer;
- trusted access broker/resource manager (tab/rm), which handles tpm
resources and process coordination.
this package contains the tss and tcti libraries that client applications will link against when they require accessing the tpm.