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Optimality is actually not a well-defined term for secret sharing, and can refer to a number of different issues. First, one issue that is often considered is the size of the share that each party holds in the scheme. If the size of a party's share equals the size of the secret itself, then the secret sharing scheme is called ideal. (Formally, we don't talk ...


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A solution is given by Peter Ryan, Crypto Santa. In The New Codebreakers, vol. 9100 of Lecture Notes in Computer Science, pp. 543-549, Springer, 2016. http://dx.doi.org/10.1007/978-3-662-49301-4_33 An earlier version (with Sjouke Mauw and Sasa Radomirovic) can be found at http://hdl.handle.net/10993/25936 (Open access), Security protocols for Secret Santa.



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