Abstract:

In order to overcome the problems of high redundancy and information transparency within Luby transform (LT) codes, based on arithmetic coding with confidentiality, a low redundancy LT (LRLT) code is designed. For the LRLT code, the neighbor information is modeled as sequence and losslessly compressed by taking the columns of the generation matrix as unit. This scheme keeps the structure of the LT code and effectively reduces the amount of transferred data. Moreover, the sequence model of the LRLT code can be alternated according to the key, which guarantees that the interceptor is unable to recover the original information successfully. Simulation results show that the LRLT code improves the effectiveness and confidentiality of transmission in comparison with the LT code and can be applied to secure communication.