1. W. Stallings, L. Brown, Computer Security: Principles and Practice (Pearson, Harlow, 2019)
2. W. Stallings, Cryptography and Network Security: Principles and Practice, 5th edn. (Prentice Hall, Upper Saddle River, 2011). https://www.williamstallings.com
3. W. Stallings, L. Brown, Computer Security: Principles and Practice, 3rd edn. (Pearson Education, Boston, 2015). http://www.williamstallings.com/ComputerSecurity
4. P.V. Rao, H.M. Mallikarjun, Nagendra, S. Manjusha, Design and ASIC implementation of triple data encryption and decryption standard algorithm. Int. J. Power Elec. Tech. 1(1), 1–15 (2011)
5. Y.-K. Lai, L.-G. Chen, J.-Y. Lai, Tai-Ming, VLSI architecture design and implementation for TWOFISH block cipher, in Circuits and Systems, 2002, (ISCAS, 2002)