Ad Hoc Security Associations for Groups

A security association specifies the cryptographic keys and algorithms to be used for secure communication among the participants in the association. Key agreement in ad hoc scenarios, that is, without key management infrastructure is a challenging task, in particular, if the security association should involve a group of entities. In this paper, existing pairwise ad hoc key agreement protocols are extended for groups of arbitrary number of entities. New protocols based on both passkeys and numeric comparison (short authenticated strings) are presented. Also security properties and group management for these protocols are discussed.

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