1. E. Schaefer "Devising a Better Way to Teach and Learn the Advanced Encryption Standard." [Online]. Available: math.scu.edu/~eschaefe/getfile.pdf%0D. E. Schaefer "Devising a Better Way to Teach and Learn the Advanced Encryption Standard." [Online]. Available: math.scu.edu/~eschaefe/getfile.pdf%0D.
2. C. Easttom "Cryptography -- How does it impact cyber security and why you need to know more? " 2015. [Online]. Available: https://www.brighttalk.com/webcast/10573/144651. C. Easttom "Cryptography -- How does it impact cyber security and why you need to know more? " 2015. [Online]. Available: https://www.brighttalk.com/webcast/10573/144651.
3. GCHQ "Cryptoy - explore the fascinating world of cryptography." GCHQ "Cryptoy - explore the fascinating world of cryptography."
4. CrypTool "CrypTool 2 -- CrypTool Portal." [Online]. Available: https://www.cryptool.org/en/cryptool2. CrypTool "CrypTool 2 -- CrypTool Portal." [Online]. Available: https://www.cryptool.org/en/cryptool2.