| 摘要 |
The present disclosure relates to accessing data stored in a secure manner in an unsecure memory, based on signatures forming an integrity check tree comprising a root signature stored in a secure storage space, and lower-level signatures stored in the unsecure memory. One embodiment calculates a first-level signature from the data in a group comprising a changed datum, and temporarily stores the signature calculated in a secure memory. The embodiment calculates a signature to check the integrity of a lower-level signature by using the signature to be checked and a second signature belonging to a same group as the signature to be checked, read as a priority in the secure memory and in the unsecure memory if it has different values in the secure and unsecure memories.
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