crypted with IDEA:

        | file size (bytes) |         |number.chr| all.chr  |numbers.chr| all.chr  |
CPU     |original | crypted |words/sec| 6 chars  | 3 chars  | 3 chars   | 2 chars  |
--------+---------+---------+---------+----------+----------+-----------+----------|
68030-50|   130   |   200   | 273-287 | 4000 sec | 3750 sec |    5 sec  |   38 sec |
68030-50| 22188   | 22256   |   9-11  |          |          |  125 sec  | 1000 sec |