Importance

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Abstract

Methods and systems are described for enabling secure delivery of a content item from a content source to a content receiving device associated with a decryption module configured for use with a split-key cryptosystem comprising encryption and decryption algorithms E and D, a cipher algorithm for generating encryption and decryption keys e,d on the basis of secret information S and a split-key algorithm for splitting e and/or d into i different split-encryption keys e₁, e₂, . . . , e_i and/or k different split-decryption keys d₁, d₂, . . . , d_k respectively, such that Ddk(Ddk-₁( . . . (D_d2(D_d1(E_ei(E_ei-1( . . . (E_e2(E_e1(X)) . . . ))=D_dk(D_dk-1( . . . (D_d2(D_d1(X_{e1, e2, . . . , ei}))=X wherein i,k≧1 and i+k>2, wherein the method comprises: provisioning said decryption module with first split-key information comprising at least a first split-key; generating second split-key information comprising at least a second split-key on the basis of said first split-key information, said decryption key d and, optionally, said secret information S; and, provisioning said decryption module with said at least second split-key 1 information for decrypting an encrypted content item X_e on the basis of said first and second split-key information and decryption algorithm D in said decryption module.

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First Claim