End-to-end secure data retrieval in a dispersed storage network

A computer readable memory comprises:

• a first memory element that stores operational instructions, which, when executed by a first computing device of a dispersed storage network (DSN), causes the first computing device to:
• retrieve a decode threshold number of encrypted encoded data slices of a set of encrypted encoded data slices from at least some storage units of a set storage units of the DSN, wherein the set of storage units encrypt a set of encoded data slices using a set of encryption keys to produce the set of encrypted encoded data slices, and wherein a first encoded data slice of the set of encoded data slices is encrypted based on a first encryption key of the set of encryption keys to produce a first encrypted encoded data slice of the set of encrypted encoded data slices;
• generate a decoding matrix based on pillar numbers of the decode threshold number of encrypted encoded data slices and an encoding matrix;
• dispersed storage error decode the decode threshold number of encrypted encoded data slices based on the decoding matrix to produce an encrypted data segment;
• send the encrypted data segment and the pillar numbers to a second computing device of the DSN;
• and
• a second memory element that stores operational instructions, which, when executed by the second computing device, causes the second computing device to:
• identify a particular subset of encryption keys of the set of encryption keys based on the pillar numbers;
• and
• decrypt the encrypted data segment based on the particular subset of encryption keys.