Distributed cryptographic function application protocols

Recovery of data stored in a fault-tolerant and secure way requires encryption and / or decryption of data with secret cryptographic functions, for which a group of processors should be responsible. For this purpose, the here-introduced distributed cryptographic function application protocols (DCFAPs) can be applied. DCFAPs are executed on a set, N , of N processors, in order to apply a secret cryptographic function F, while satisfying the following properties: ❏ malicious behaviour of up to T processors from N does not inhibit application of F ❏ any group of N-T or more processors from N is capable of applying F ❏ T or fewer colluding processors from N are unable to compute or apply F.