# ASCII Key Generates unique alphanumeric strings based on any printable ASCII characters. The length of the source string is not preserved. You can choose to exclude lowercase letters from the generated values. ## Characteristics


Consistency	Yes, can be made self-consistent.
Linking	No, cannot be linked.
Differential privacy	No
Data-free	No
Allowed for primary keys	Yes
Allowed for unique columns	Yes
Uses format-preserving encryption (FPE)	Yes
Privacy ranking	3 if not consistent 4 if consistent
Generator ID (for the API)	`AsciiPkGenerator`

## How to configure To configure the generator: 1. To exclude lowercase letters from the generated values, toggle **Exclude Lowercase Alphabet** to the on position. 2. Toggle the **Consistency** setting to indicate whether to make the generator consistent.\ \ By default, the generator is not consistent. 3. If [Structural data encryption](https://docs.tonic.ai/app/generation/generators-assign-config/generators-data-encryption-config) is enabled, then to use it for this column, in the advanced options section, toggle **Use data encryption process** to the on position.