Polymorphic encryption key matrices

A method comprising:

• providing a key bundle, the key bundle comprising a first cryptographic key, an associated first key identifier, and an associated first cryptographic function identifier, the first cryptographic function identifier identifying a first cryptographic function and providing information sufficient to derive the first cryptographic function, the first cryptographic function identifier comprising an encoded mathematical function describing the first cryptographic function;
• providing a plurality of encrypted keys, each encrypted key having a key identifier, the plurality of encrypted keys selected such that encrypted content is decryptable by:
• selecting, by a hardware processor, a first encrypted key from the plurality of encrypted keys such that the identifier of the first encrypted key is equivalent to the first key identifier;
• determining, by the hardware processor, the first cryptographic function corresponding to the first cryptographic function identifier using at least the first cryptographic function identifier;
• applying, by the hardware processor, the first cryptographic function to the first encrypted key using the first cryptographic key to obtain a first intermediate cryptographic key;
• determining, by the hardware processor, a content cryptographic key using the first intermediate cryptographic key, the content cryptographic key being adapted for decryption of encrypted content;
• and
• applying the content cryptographic key to the encrypted content.

A media player comprising a non-transitory computer readable storage medium having program instructions embodied therewith, the program instructions executable by a hardware processor of the media player to cause the media player to perform a method comprising:

• reading a key bundle, the key bundle comprising a first cryptographic key, an associated first key identifier, and an associated first cryptographic function identifier, the first cryptographic function identifier identifying a first cryptographic function and providing information sufficient to derive the first cryptographic function, the first cryptographic function identifier comprising an encoded mathematical function describing the first cryptographic function;
• receiving a plurality of encrypted keys, each encrypted key having an identifier;
• selecting a first encrypted key from the plurality of encrypted keys such that the identifier of the first encrypted key is equivalent to the first key identifier;
• determining the first cryptographic function corresponding to the first cryptographic function identifier using at least the first cryptographic function identifier;
• applying the first cryptographic function to the first encrypted key using the first cryptographic key to obtain a first intermediate cryptographic key;
• and
• determining a content cryptographic key using the first intermediate cryptographic key, the content cryptographic key being adapted for decryption of encrypted content.