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| An original database, , in which each represents a transaction |
| A projected database, , in which each contains sensitive itemsets |
| A sanitized database, from which no sensitive information can be mined |
| The minimum support threshold ratio |
| The risky bound parameter, using which the itemsets within the boundary are used to evaluate the processed transactions |
| FI | The set of frequent itemsets in , in which each itemset fij is larger than or equal to the minimum support threshold |
| A frequent itemset |
| The set of infrequent 1-itemsets in , in which each itemset is below the minimum support threshold |
| A small (infrequent) 1-itemset |
| A set of sensitive itemsets , in which each element represents an itemset that should be hidden in the original database |
| A sensitive itemset |
| HStmp | The temporary set of sensitive itemsets outside the boundary |
| FItmp | The temporary set of large itemsets outside the boundary |
| The temporary set of small 1-itemsets outside the boundary |
| HFD | The hiding failure dimension used to consider the side effects of hiding failures |
| MID | The missing itemset dimension used to consider the side effects of missing itemsets |
| AID | The artificial itemset dimension used to consider the side effects of artificial itemsets |
| () | The value of the sensitive itemset in transaction |
| () | The value of the large itemset in transaction |
| () | The value of the small 1-itemset in transaction |
| MAXHS | The maximal count of the sensitive itemsets in the set of |
| freq() | The occurrence frequency of the sensitive itemset in the set of HS |
| MAXFI | The maximal count of the large itemsets in the set of FI |
| freq() | The occurrence frequency of the large itemset |
| The minimal count of the small 1-itemsets in the set of |
| freq() | The occurrence frequency of the small 1-itemset |
| The weights for HFD, MID, and AID, in which |
| HMAU | The utility value used to determine whether the processed transactions should be deleted |
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