一种弹载记录仪的实时加密方法

摘要

针对某型导弹的弹载记录仪对其测试参数保密的要求，重点对弹载记录仪的加密环节做了深入研究。加密环节主要通过在采集数据每个字节中选其最低位及次低位作选择密钥的方法实现数据的实时加密，加密后分别存储到FLASH对应的空间。整个运算在CPLD内部进行且加密所用时间仅为数据在CPLD内部的传输走线延时。经实弹测试，该加密方法能够安全可靠实施。%According to the requirement of one missile-borne data recorder must maintain its parameters confidentiality. The design focuses on encryption. The part mainly achieves real-time encryption data through selecting the key with two lowest bits in each byte. Encryption data store in FLASH corresponding space. The whole operation is in CPLD and time used to encrypt is only data transmitted in the CPLD internal alignment delay. Live-fire test shows that the encryption algorithm can be performed with both safety and reliability.