Data decryption system and data decryption method

The invention relates to a data decryption system and a data decryption method. A data decryption system includes an address check circuit, an encryption and decryption processor and an operational circuit. The address check circuit is configured to receive an address over an address channel. Theoperational circuit is coupled to the encryption and decryption processor, wherein theoperational circuit is configured to receive read data indicated by the address from the storage device through the data channel during a first period; the encryption and decryption processor calculates a second key according to the first key and the address during a second period, and the second key is used for decrypting the read data, and wherein the first period is overlapped with the second period. 本公开涉及数据解密系统及数据解密方法。一种数据解密系统包含地址检查电路、加解密处理器及运算电路。地址检查电路经配置以通过地址信道接收地址。运算电路耦接加解密处理器，其中该运算电路经配置以于第一期间通过数据信道从储存装置接收该地址所指示的读取数据；其中，加解密处理器于第二期间根据第一密钥及该地址以计算第二密钥，该第二密钥用以解密该读取数据。其中，第一期间与第二期间重叠。