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Group key management in wireless and mobile environments

Explore hierarchical group key management in wireless and mobile environments. Learn about domain structure, key distributors, area management, and rekeying strategies for optimal security. Discover innovative approaches to handle member mobility efficiently.

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Group key management in wireless and mobile environments

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  1. Group key management in wireless and mobile environments Lakshminath Dondeti/Nortel ldondeti@nortelnetworks.com IETF-51, London August 2001

  2. Hierarchical group key mgmt • All members belong to a “Domain” • Managed by a domain key distributor (DKD) • Domain is divided into several Areas • Areas managed by AKDs • AKDs and DKD belong to a secure grp As in –intraGKM- I-D (Hardjono-Cain)

  3. More on Areas • Each Area is independently managed • Geographically or logically defined • AKD may use LKH etc., for rekeying • AKDs are not mobile • is the topic of our ongoing research

  4. DKD … … AKD 1 AKD 4 AKD 6 AKD 7 join leave transfer Member mobility model

  5. Mobility and rekeying • Movement within an Area DOES NOT cause rekeying • Movement out of the Domain DOES require rekeying • What happens when members move between Areas? • Focus of this talk and the related I-D

  6. Rekeying due to mobility • When a member moves • Change area keys • Rekeying overhead at the time of the move • Don’t change area keys • Larger rekeying overhead when member leaves domain • Need to keep track of who holds which keys • Issues other than rekeying • Membership verification by new AKD

  7. Baseline rekeying • Transfer implemented as a leave followed by a join • Changes both area keys on each move • Changes domain data key • Inefficient due to unnecessary rekeying of data key(s)

  8. Immediate rekeying • Transfer is a new operation • Old AKD and new AKD rekey areas • Domain data key(s) not changed • Better than baseline! • can we do better?

  9. Delayed rekeying • Defer rekeying until • A member joins/leaves the domain • A threshold is reached • Number of areas visited • Number of members holding a key • periodic

  10. Summary and conclusion • Rekeying due to member mobility in hierarchical grp key mgmt • Three approaches proposed • Analysis shows IR performs best • AKD mobility and further analyses part of future work

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