The security that is used in store value card is a multilayer integrated chip security circuitry which is used to control the access to the funds. This security is much more securing then the magnetic-stripe which is used in credit card or debit cards.
By using this security the information of the user will be harder to be retrieve from if the card is stolen compared to a credit card where a magnetic-stripe reader is only needed to gather the information that is in the card. Store value card also uses an encrypted key to authenticate the user whenever a transaction is made.
Reference:
http://www.txwesleyan.edu/~jvortega/security/smartcard_security.html
