Optimized Robust Key Agreement (Secure Spread 1.0)

Secure

Wait for

Final_Token

(FT)

Wait for

Partial_Token

(PT)

Wait for

Key_List

(KL)

Wait for

Cascading

Membership

(CM)

Collect

Fact_Outs

(FO)

Wait for

Self_Join

Join group

Wait for

Membership

Reduces the cost to about 50% if no cascaded event happens.

A process can crash/disconnect in any state.

The network can partition/merge in any state.

Leave group

[ICDCS01]

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