1. Documents protected by XML security may be signed or encrypted long before anyone can predict who will be the ultimate recipients. What measures are taken to ensure that the latter has access to the algorithms used by the former?

2. The guarantees offered by conventional servers may be violated as a result of:

1. Physical damage to the host;
2. Errors or inconsistencies introduced by system administrators or their managers;
3. Successful attacks on the security of the system software;
4. Hardware or software errors.
   1. Give two examples of possible incidents for each type of violation.
   2. Which of them could be described as a breach of trust or a criminal act?
   3. Why is this relevant for peer-to-peer systems?