Case-Preserving and Position-Preserving Tokenization

If you work with the Alpha-Numeric (0-9, a-z, A-Z) token type and SLT_2_3 tokenizer, you can specify additional tokenization options for case preservation and position preservation.

This section explains the Case-Preserving and Position-Preserving tokenization options.

  • Case-Preserving and Position-Preserving tokenization was designed to support specific business requirements. However, this design comes with a trade-off, as it affects the cryptographic strength of the tokens.
  • When preserving the case and position of Alpha-Numeric characters, some information may be leaked through the tokenized value.
  • In addition, depending on the length of the Alpha and Numeric substrings, tokens may suffer the same weaknesses as Short Tokens, as described in the section Short Data Tokenization.
  • It is recommended that this method should not be used for most use cases. Before using this method, contact Protegrity Support to ensure that the risks are fully understood.
Case-Preserving Tokenization

The case-preserving tokenization secures sensitive data while preserving the original structure and layout of the input.

Position-Preserving Tokenization

The position-preserving tokenization preserves the position of the alphabetic characters and numbers when tokenizing the alpha-numeric values.


Last modified : August 21, 2025