My mistake, I forgot the zero and have corrected. Any system with valid security would stop anyone from testing thousands of times. Maybe only two times, three at the most.
The best pin number would consist of numbers and letters. With four positions the combinations would be 1,679,616 vs 10,000. 26 letters + 10 numbers = 36 to the 4th power. The more possible combinations you have the safer you are. 36 to the 5th power increases the combinations to 60,466,176.
Hope this mental exercise relieves the uneasiness some have in giving out this info.
The best pin number would consist of numbers and letters. With four positions the combinations would be 1,679,616 vs 10,000. 26 letters + 10 numbers = 36 to the 4th power. The more possible combinations you have the safer you are. 36 to the 5th power increases the combinations to 60,466,176.
Hope this mental exercise relieves the uneasiness some have in giving out this info.