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Method for the authentication of data
| Details |
Inventors: Viricel, Gilles;
Assignee: Gemplus Card International (Gemenos, FR)
Primary Examiner: Swann; Tod R.
Assistant Examiner:
Attorney, Agent or Firm: Plottel; Roland
Disclosed is a method of authentication of data elements of the type that may be needed, for example, to authenticate a chip card before permitting a transaction instrument to deliver a service to the holder of this card. Should the authentication consist in ascertaining that an information content is truly present in the card at a determined address of a memory of the card, it is proposed to make the length of the block of information elements parametrizable and to include, in the algorithm for the encryption of this block, data relating to this length; the logic address of the file that contains the block and the position of the block in the file are also used. Furthermore, preferably a recursive algorithm is performed in N steps: the block to be authenticated is sliced into slices of fixed length and, at each step, the Exclusive-OR function of a slice considered and of the result of the preceding step is used as the data to be encrypted. FIG. 1. |
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DETAILED DESCRIPTION It is an aim of the invention to increase the possibilities of the method of authentication so that one and the same chip card (in the case of chip cards) can be used in a greater number of applications and, consequently, so that one and the same card can contain information elements to be authenticated that are very different in nature.
According to the invention, there is proposed a method of authentication that uses data elements to be authenticated in the form of a block of data elements contained at a determined location of a determined file, and an encryption program that brings into play, as data to be encrypted, the logic address of the file containing the block of data elements, the position and the length of the block of data elements in the file and the actual contents of the block of data elements.
This enables the authentication of the information irrespectively of its size and not just the authentication of information with a size fixed beforehand.
Therefore, greater flexibility of use is obtained since it is possible to use one and the same card for very different applications requiring the authentication of blocks of information elements with a size that can be parametrized as a function of the application.
For the encryption programs that use data elements of constant length, the information on the size of the block of data elements to be encrypted is used to split up the information to be encrypted into N slices of constant length; and an encryption operation is carried out for each slice.
The encryption program therefore takes account of the size of the block to enable an encryption irrespectively of this size.
In an advantageous mode of implementation of the invention, the encryption program uses an algorithm C (D, K) with a secret key K, which is carried out iteratively in the following way: the block of information elements to be authenticated is split up into slices of determined size, the nth order slice being designated by d.
sub.
n ; the encryption algorithm C(D, K) is carried out iteratively on data elements which, at a step n, bring into play the slice d
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