Key Agreement in Groups Sample Clauses

Key Agreement in Groups. Characteristic of the centralized key management schemes mentioned in the previous section is the assumption of pre-existing security associations. If the keys generated by the KDC were transmitted to the members of the group in plaintext, an attacker eavesdropping on the communication chan- nel would be able to obtain the group key. Therefore, members of the group have to share a pairwise key with the KDC in order to obtain those secrets in a confidential manner. While such an approach is very light on computational requirements placed on the individual group members, it is demanding on the central key distribution server: Increased storage requirements – a client only has to store the pairwise keys, the group key, and any relevant key encrypting keys from non- leaf nodes on his keypath, a total of log2 n + 1. In contrast, the server has to store all the pairwise keys and the whole key tree for every group it maintains. Assuming a perfectly balanced binary key tree, this amounts to 2n − 1 keys per group of size n. Increased computational burden – the server has to generate all the re- quired keys and encrypt these before sending them to the members of a group. Increased entropy requirements – as the server is responsible for the gen- eration of the keying material, it must have access to a random or pseudorandom number generator seeded with enough entropy not to produce weak keys. Unless one can do away with pairwise key establishment prior to the actual key distribution taking place, there will always be a significant over- head in first establishing the group key. This becomes even more costly for
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Related to Key Agreement in Groups

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