METHODS FOR CRYPTOGRAPHIC DELEGATION AND ENFORCEMENT OF DYNAMIC ACCESS TO STORED DATA

Methods for cryptographic delegation and enforcement of dynamic access to stored data are disclosed. An example method includes generating for a first modified data block, a new per-block hash value using as a hash function input data contained in the first modified data block or a new per-block hash message authentication code (HMAC) using as hash function inputs a new per-block hash key and data contained in the first modified data block, writing the new per-block hash value or the new per-block HMAC to data block metadata associated with the modified data block in the protected data object, and writing the first modified data block to one of the data blocks of the protected data object.