Encrypted aggregated transaction data exchange with transaction data provider

A system comprising:

• one or more data processors;
• and one or more storage devices storing instructions that, when executed by the one or more data processors, cause the one or more data processors to perform operations comprising:
• encrypting a set of identifiers using a first encryption algorithm;
• providing access to the encrypted set of identifiers to a transaction data provider;
• accessing encrypted transaction data and a first set of double encrypted identifiers from a transaction data provider, the encrypted transaction data comprising a plurality of transaction data pairs each comprising an encrypted identifier encrypted using a second encryption algorithm and an encrypted transaction value encrypted using a third encryption algorithm, the first set of double encrypted identifiers comprising the provided encrypted set of identifiers encrypted using the second encryption algorithm;
• encrypting each encrypted identifier of the plurality of transaction data pairs using the first encryption algorithm to generate a second set of double encrypted identifiers,
• determining a set of matched transaction data pairs by matching one or more of the double encrypted identifiers of the first set to one or more of the double encrypted identifiers of the second set;
• generating a random offset value;
• encrypting the random offset value using a secret of the third encryption algorithm;
• calculating an encrypted aggregate offset sum based on the encrypted random offset value and each encrypted transaction value of the set of matched transaction data pairs;
• providing access to the encrypted aggregate offset sum to the transaction data provider;
• accessing a decrypted aggregate offset sum;
• and
• calculating an aggregate transaction value by subtracting the random offset value from the decrypted aggregate offset sum.

A computer-readable storage device storing instructions that, when executed by one or more data processors, cause the one or more data processors to perform operations comprising:

• accessing first encrypted data comprising a plurality of data pairs, each of the plurality of data pairs comprising encrypted first data encrypted using a first encryption algorithm and encrypted second data encrypted using a second encryption algorithm;
• generating second encrypted data using the first encrypted data comprising:
• encrypting each encrypted first data of the plurality of data pairs using a third encryption algorithm to generate double encrypted first data,
• generating a random offset value for each of the plurality of data pairs,
• encrypting the random offset value for each of the plurality of data pairs using a secret of the second encryption algorithm, and
• generating an encrypted sum of the randomized offset value and the encrypted second data of the plurality of data pairs;
• encrypting a set of third data using the third encryption algorithm;
• transmitting the second encrypted data and the encrypted set of third data to a data provider;
• accessing a set of matching double encrypted data and an aggregated sum, the set of matching double encrypted data based on the encrypted set of third data and the generated double encrypted first data, the aggregated sum based on values of the randomized offset value and the encrypted second data of the plurality of data pairs for the set of matching double encrypted data;
• and
• calculating an aggregate value based on the set of matching double encrypted data, the aggregated sum, and the generated random offset value for each of the plurality of data pairs.