Rate distortion theory is considered for the Shannon cipher system (SCS). The admissible region of cryptogram rate R, key rate R/sub k/, legitimate receiver's distortion D, and wiretapper's uncertainty h is determined for the SCS with a noisy channel. Furthermore, inner and outer bounds of the admissible region of R, R/sub k/, D, and wiretapper's attainable minimum distortion D/spl tilde/ are derived for the SCS with a finite discrete source and a noiseless channel.
展开▼
机译：香农密码系统（SCS）考虑了速率失真理论。对于具有噪声信道的SCS，确定密码率R，密钥率R / sub k /，合法接收方的失真D和窃听者的不确定性h的允许区域。此外，对于具有有限离散源和无噪声通道的SCS，推导了R，R / sub k /，D的可允许区域的内部和外部界限，以及窃听器可达到的最小失真D / spltilde /。
展开▼
