High Quality Content by WIKIPEDIA articles! Blom's scheme is a symmetric threshold key exchange protocol in cryptography. A trusted party gives each participant a secret key and a public identifier, which enables any two participants to independently create a shared key for communicating. Every participant can create a shared key with any other participant, allowing secure communication to take place between any two members of the group. However, if an attacker can compromise the keys of at least k users, he can break the scheme and reconstruct every shared key. Blom's scheme is a form of threshold secret sharing. The scheme was proposed by the Swedish cryptographer Rolf Blom in a series of articles in the early 1980s. Blom's scheme is currently used by the HDCP copy protection scheme to generate shared keys for high-definition content sources and receivers, such as HD DVD players and high-definition televisions.

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