BCHKBreast Cancer and Heredity Knowledge Scale
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In order to achieve key freshness, it is required for the BS to change PK and BCHK to PK' and BCHK' periodically or whenever needed.
Similarly BS will change BCHK to BCHK' and distribute it to all cluster heads securely by using hash function.
In the empty area inside the trough, the projected shadow corresponds to the surface BCHK, but inside the glass block it corresponds to the surface BDGI.