Yahalom implementation on python+flask

1. gen num Ra
2. send to Bob with own id

1. gen Rb
2. add Rb to recieved message
3. chiper with Bob/Trent common key
4. adding own id to message
5. send message to Trent

1. gen seanse key
2. create message with seanse key, Ra, Rb,
3. chiper message with Alice/Trent common key
4. send message to Bob with own id
5. create message with Alice id and seanse key
6. chiper with Bob/Trent common key
7. send with message to Alice

1. fcompare Ra from first message with own Ra
2. if comparing success, send to Bob second message from Trent, chiphered by seanse key

1. get from message seanse key
2. decrypt message, containing Rb
3. compare Rb with own Rb