SmartID’s, or Smart Identifier Patterns are regular expressions created with qualifiers when appropriate. These SmartID’s are used during Data Loss Prevention (DLP) processing to look for and act on specific violations.
In some cases, SmartID’s are very generic due to the nature of the search item and must be combined with dictionaries and proximity searches in order to reduce the number of false positives.
For example, a rule that is looking for Social Security Numbers (SSN) will trigger if the format of nine digits (nnn-nn-nnnn) is matched, but could also trigger on any nine digit number. To reduce the number of false positive results on unformatted SSN, we look for numbers that are nine digits and do not whole group zeros (e.g. 000-11-2222, or 111-00-2222). We also check that the number is near an indicative word in one of our dictionaries (e.g. SSN or Soc Sec No).
Alaska or Alabama driver’s license numbers are unformatted numbers of lengths between five and seven or seven and eight digits respectively. In these cases we would expect a higher number of false positives since these license numbers are indistinguishable from each other if the length is equal to seven.
We attempt to reduce the number of false positives for driver’s licenses by using the SmartID’s in conjunction with the USDL (United States Drivers License) dictionary.
Smart Identifier Formats
The following is a description of the most commonly used SmartIDs and the search pattern that is being used for Social Security Numbers, Credit Cards and Drivers Licenses. In the case of most Credit Cards, a valid must also work with the Luhn Algorithm, so the SmartID contains the logic to verify the number against this checksum formula.
Social Security Number Smart Identifier
Formatted – matches nnn-nn-nnnn
Unformatted – matches – nnnnnnnnn
Credit Card Smart Identifier
American Express (0000-000000-00000):
– 15 digit number that starts with 34 or 37 + Luhn.
Diners Club / Carte Blanche (0000-000000-0000:
– 14 digit numbers that start 3000-3059/3600-3699/3800-3899 followed by 6 digits followed by 4 digits.
Discover Card (0000-0000-0000-0000):
– 16 digit numbers that start with 6011 + Luhn.
Master Card (0000-0000-0000-0000):
– 16 digit numbers that start with 5100-5599 + Luhn.
Union Pay-China (0000-0000-0000-0000):
– 16 digit numbers that start with 62 + Luhn.
– 13 or 16 digit numbers that start with 4 + Luhn.
Banking Smart Identifier
ABA Routing Number:
ABA Routing Number and Bank Account Number:
Banking Account Terms and Bank Account Number:
Driver’s License Smart Identifiers
Canadian Drivers Licenses
Prince Edward Island:
State Identification Numbers
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