7. The system according to claim 2 , further comprising a random modification selector for randomly selecting the character level modifications from the group.
7. The system according to claim 2 , further comprising a random modification selector for randomly selecting the character level modifications from the group. 8. The system according to claim 7 , wherein said auto-encoder is further adapted for incrementing the frequency of injecting the random character level modifications to the variable length CLIS, responsive to an increase in the level of similarity of the variable length CLOS to the respective original variable length CLIS prior to their random character level modifications.