Hidden biometrics, due to their resistance to duplication and hacking, offer superior security. This work utilizes vein biometrics for their hidden nature, specifically combining palm and finger vein data to enhance security. One key challenge in biometric systems is protecting the stored template, which cannot be revoked or reissued once compromised. We propose a method that merges two vein templates using user-specific scaling and rotation, creating an artificial, irreversible template. Even if the template is stolen, altering the user’s secret information regenerates a different template, protecting the original data. Personal Image Identification (PII) adds another user-specific layer of security. The approach employs salt cryptography to ensure simplicity and irreversibility, without storing the original template. Compared to existing methods, our technique offers equivalent accuracy with higher resistance to attacks and lower computational complexity.