Data accessing device and method

A data accessing device to access a storage element that stores encrypted data, wherein the data accessing device comprises:

• a processing circuit configured to generate an accessing address and decryption related information according to an accessing command;
• a storage controller configured to receive the accessing address and access corresponding encrypted data from the storage element in response to the accessing address;
• a decrypting circuit configured to receive the decryption related information and a pre-stored key to generate a decrypting cipher according to the decryption related information and the pre-stored key;
• and
• a combinational logic circuit configured to receive the corresponding encrypted data and the decrypting cipher to perform a logic operation to generate decrypted data according to the corresponding encrypted data and the decrypting cipher that enables the processing circuit to access the decrypted data;
• wherein a first time length that the decrypting circuit generates the decrypting cipher is smaller than a second time length that the storage controller access the corresponding encrypted data.