Covering film intelligent card with extended functions

Abstract

The invention provides a covering film intelligent card with extended functions, and relates to the technical field of an intelligent card. The covering film intelligent card comprises a read-only memory, a random access memory and a nonvolatile erasable memory. An operating system of the read-only memory comprises a main process, an application command processing unit and a performance function unit. The random access memory comprises variable data. The nonvolatile erasable memory comprises modifiable user data. Structural characteristics of the covering film intelligent card are that the nonvolatile erasable memory also comprises a performance function pointer table, an application command function pointer table, a patch function unit, an additionally arranged command function pointer table and an additionally arranged application command function unit. The operating system of the read-only memory acquires a function pointer via inquiring the performance function pointer table, the application command function pointer table and the additionally arranged command function pointer table, and a function is scheduled in a function pointer mode so that functions of the intelligent card are realized. The covering film intelligent card can be applied to function restoration and expansion of new functions of the intelligent card after film covering so that the covering film intelligent card has characteristics of being simple in structure, small in space occupation and high in execution speed.

Description

technical field [0001] The invention relates to the technical field of smart cards, in particular to mask smart cards with extended functions. Background technique [0002] With the popularity of smart cards, smart cards have been widely used in various fields of life such as mobile communications, e-commerce, transportation, social security and finance. [0003] One type of smart card is a masked smart card, the structure of a masked smart card is as follows figure 1 As shown, there are read-only memory S101, random access memory S103 and non-volatile and erasable memory S102. The operating system S1011 of the read-only memory S101 includes a main process S1012, an application command processing unit S1013 and a functional function unit S1014, the random access memory S103 contains variable data, and the non-volatile and erasable memory S102 contains modifiable user data, such as bus card swiping records , amount, etc. [0004] When manufacturing a masked smart c...

AI Technical Summary

Problems solved by technology

The program structure and data structure of the above-mentioned first method are complicated, and the additional code space overhead and time overhead are relatively large, which affects the execution speed of the smart card operating system, and the scalability is limited by the size of the memory; the second method is more efficient than the first method. The method is highly scalable and easy to implement, but the disadvantage of this method is that on the one hand, the function call is indirectly called through the jump function, which increases the extra code jump time; on the other hand, the function call table occupies a large space, which is different from the jump function. The size of the transfer function has a linear relationship. This part of the space overhead is determined before the mask. When the non-volatile and erasable memory space is small, there are fewer scalable interfaces; third, when the masked smart card operating system If the application requirements are not met and additional application command parsing is required, this method cannot realize the parsing of the newly added commands

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