Secrecy, the intentional concealment of personal information, is a widespread, common phenomenon. Despite its popularity, however, the intricacies of secrecy have received limited attention within research. This study aimed to illuminate individual differences in secrecy by developing novel scales to examine one’s ability to keep secrets and one’s attitude toward secrecy. An online survey was conducted, encompassing the Common Secrecy Questionnaire (CSQ), the newly developed Secrecy Ability Scale (SAB) and Secrecy Attitude Scale (SAT), and various additional scales in light of convergent and discriminant validity. Results of the confirmatory factor analyses confirmed the proposed one-factor structure for the 9-item SAB, while the factor structure of the 10-item SAT requires further evaluation. Reliability and correlational analyses revealed appropriate internal consistency as well as satisfactory convergent and discriminant validity for both scales. Taken together, these findings significantly contribute to our understanding of how behavior, ability, and attitude shape the complex dynamics of secrecy.