The security and confidentiality of the information has become a significant factor in the communication field. Several techniques for encryption and decryption are proposed to promote the security of the communication systems. Most powerful and significant part of the encryption is a key generation. Presently, hackers are able to break the key with help of the modern high computing machines. In this research, hybrid cryptographic algorithm -Extended Tiny Encryption Algorithm (XTEA) combined with International Data Encryption Algorithm (IDEA) was implemented for improving the security in real-time applications. A large key size ensures the randomness, but proportionally maximizes the network load with high complexity. To overcome this problem, the random numbers were generated using a Linear Feedback Shift Register (LFSR) scheme for key function. This algorithm was appropriate for encryption and decryption of online streaming data. The proposed method is named as International Data -Extended Tiny based Encryption Algorithm -LFSR (ID-XT-EA-LFSR) method. The ID-XT-EA-LFSR method improves the FPGA performances up to 50.43% compared to the QTL, DROM-CSLA-QTL and XTEA algorithms.
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