Major Issues
In modern practice, cryptographic engineering is deployed in crypto systems. Like most engineering design, these are wholly human creations. Most crypto systems are computer software, either embedded in firmware or running as ordinary executable files under an operating system. In some system designs, the cryptography runs under manual direction, in others, it is run automatically, often in the background. Like other software design, and unlike most other engineering, there are few external constraints.
Read more about this topic: Cryptographic Engineering
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