SECURE PAGERANK COMPUTATION SYSTEM, METHOD THEREFOR, SECURE COMPUTATION APPARATUS, AND PROGRAM
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United States of America Patent
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Issued Date -
Apr 11, 2024
app pub date -
Feb 10, 2021
filing date -
Feb 10, 2021
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Abstract
To calculate PageRank with high accuracy using transaction data held by a plurality of data sources as input and keeping the transaction data of each data source secret. A data source apparatus (1) calculates a transaction rate for each combination of transaction entities (S12). The data source apparatus (1) encrypts the transaction rate and transmits the encrypted transaction rate to each secure computation apparatus (2) (S13). Each secure computation apparatus (2) receives a ciphertext of the transaction rate from a plurality of data source apparatuses (1) (S21). The secure computation apparatus (2) securely calculates a ciphertext which becomes, when decrypted, PageRank of the computational objective transaction entity by using the ciphertext of the transaction rate related to the computational objective transaction entity and the ciphertext of the PageRank of a transaction counterpart (S22).
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