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The four critical ideas in the design of WiscKey are:

1. Separation of keys from values, with only keys stored in the LSM-tree and values in a separate log file.
   
2. Utilization of the parallel random-read characteristic of SSD devices to handle unsorted values during range queries.
   
3. Implementation of unique crash-consistency techniques to manage the value log efficiently.
   
4. Optimization of performance by removing the LSM-tree log without sacrificing consistency, reducing system-call overhead from small writes.