| 摘要 |
A first signal S1 containing encrypted data based on a conversion constant Y.Zy' and a conversion constant X is transmitted from a transmission side device (1) to a reception side device (1) . A second signal S2 containing encryption data based on the conversion constant X.Zy', a conversion constant Y, and a pattern conversion constant Zy of the conversion constant Zy' is transmitted from the transmission side device (1) to a relay device (2) . A second' signal S2' in which the pattern conversion constant Zy of the second signal S2 is converted into a conversion constant Zy' is transmitted from the relay device (2) to the reception side device (1). The reception side device (1) reads the encrypted data and the conversion constants X, Y, Zy' by the f irst signal S1 and the second' signal S2' and performs decryption and authentication of the encrypted data. |
