Changes
/* Receive */
|-
|align="right"| check signature
|align="center"|<math> verify(m) == (m, \sigma) </math>
|-
|align="right"| decrypt messagen
|-
|align="right"| Verify session id and hash
|align="center"|<math>\sigma \leftarrow sid_i == sid_{rec} & \; \textrm{and} \; h == Digest(parent\_id)</math>
|-
|align="right"| Update sender key share or session share key|align="center"|<math>(y_j,\leftarrow s \; \textrm { or } \; z_{jij}\leftarrow s</math>|-|align="right"| if all users' share are received session key|align="center"|<math>k_i \leftarrow ComputeSessionKey(z_1,...,z_n)</math>
|-
|align="right"| return m
|align="center"|<math>m</math>
|}
