Configure target filter characters to limit the characters that can appear in a target column.
Masking
replaces characters in the target with the target filter characters. For example, enter the following characters to configure each mask to contain the uppercase alphabetic characters A through F:
ABCDEF
To avoid generating the same output for different input values, configure a wide range of substitute characters, or mask only a few source characters. The position of each character in the string does not matter.