Data management method, data management apparatus, and non-transitory computer readable medium

A non-transitory computer readable medium storing a program causing a computer to execute a process, the process comprising:

• calculating a hash value k of an original data item M by performing a mapping on the original data item M with a cryptographical hash function, that is, the hash value k is obtained from h(M);
• decrypting an encrypted data item C with the hash value k and obtain a decrypted data item;
• and
• comparing the decrypted data item with the original data item M,
• if the decrypted data item is the same as the original data item M, it is determined that the original data M corresponds to the encrypted data C, which means the encrypted data C is encrypted from the original data M,
• if the decrypted data item is not the same as the original data item M, it is determined that the original data M does not correspond to the encrypted data C,
• thereby the correspondence between the encrypted data C and the original data M is validated.

A data management method, adaptive for a cipher system conforming to a distributed electronic ledger technology, wherein the method comprising:

• calculating a hash value k of an original data item M by performing a mapping on the original data item M with a cryptographical hash function, that is, the hash value k is obtained from h(M);
• decrypting an encrypted data item C with the hash value k and obtain a decrypted data item;
• and
• comparing the decrypted data item with the original data item M,
• if the decrypted data item is the same as the original data item M, it is determined that the original data M corresponds to the encrypted data C, which means the encrypted data C is encrypted from the original data M,
• if the decrypted data item is not the same as the original data item M, it is determined that the original data M does not correspond to the encrypted data C,
• thereby the correspondence between the encrypted data C and the original data M is validated.