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Network information security related to the data storage security and data communication security, in order to improve the network information security management capabilities, the need for data encryption optimization design, this paper puts forward a DES public key data encryption technology based on forward error correction encoding before the construction of DES data using Gram-Schmidt orthogonal vector quantization method of Turbo code model to produce ciphertext sequence by the three retransmission mechanism, the ciphertext sequence of FEC encoding design, combined with the differential evolution method of frequency test, the realization of DES data encryption key structure in network information security, public key encryption scheme to choose binary encoding resist ciphertext attack. The simulation results show that the encryption technology used in DES data encryption has strong anti attack ability, good scrambling key, high security and feasibility.