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in a nutshell : if your password is compromised, you can change it and recover your security ; if a biometric marker of yours is compromised (say your iris), you cannot change it (at reasonable cost !) ... so how can you recover your security ?
cancellable biometrics aims at finding ways to use biometric markers to build identifiers in such a way that you can change the identifiers if compromised
the reference given above has the details
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Cancelable biometrics refers to the intentional and systematically repeatable distortion of biometric features in order to protect sensitive user-specific data. If a cancelable feature is compromised, the distortion characteristics are changed, and the same biometrics is mapped to a new template, which is used subsequently. Cancelable biometrics is one of the major categories for biometric template protection purpose besides biometric cryptosystem.
Dear Ram Thota
The attached file is good to understand the Cancelable biometrics
Cancellable Biometrics is a Biometric template which can be replace whenever is needed. similar to your password which you can change it anytime you want.
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