Years ago I worked support at an ISP who had usernames which was a 12 digit number. Most regular users and 1st level support do no know the NATO phonetic alphabet. An easy trick is trick is then to read back the number for confirmation but use another grouping of digits. Most users read 1 digit at a time so I would read back 2. One-Two becomes twelve. If they used 2 digits I would for ease use 3 rather then 1. This is a very easy way to do a fake "checksumming" regular people.
Tangent: All number started with 12 which in effect made them 10 digits. They worked together with a banking system and the bank folks thought 10 digits was not secure enough so they complied and added 12 in front of everything.
> Tangent: All number started with 12 which in effect made them 10 digits. They worked together with a banking system and the bank folks thought 10 digits was not secure enough so they complied and added 12 in front of everything.
Tangent: All number started with 12 which in effect made them 10 digits. They worked together with a banking system and the bank folks thought 10 digits was not secure enough so they complied and added 12 in front of everything.