The present invention relates to a data processing device, in particular an electronic memory component, comprising a plurality of access-secured sub-areas, in particular a plurality of access-secured memory areas, each having at least one assigned parameter (an, an−1, . . . , a1, a0), in particular address.
The present invention further relates to a method of encrypting at least one parameter (an, an−1, . . . , a1, a0), in particular the address, of at least one access-secured sub-area, in particular at least one access-secured memory area, of at least one data processing device, in particular at least one electronic memory component.
In known methods of encrypting confidential data, such as for instance personal data, key data or otherwise sensitive data, a non-volatile memory unit can only be encrypted as a compact physical overall memory in a more or less fixed manner; this means, in other words, that access can only conventionally be denied to memories in their entirety.
This method, known from the prior art, of encrypting entire I[ntegrated] C[ircuit] areas is considered disadvantageous in view of the high cost associated therewith together with its technical complexity and lack of flexibility. For this reason, attempts are constantly being made to develop alternative methods of encrypting access-secured memory areas or other sub-areas.
If, for instance, to control a memory of the size M=2i=2n+1with i=n+1 address buses precisely these address buses are encrypted over the entire address space, modification of one address bus would have the possible effect of modifying a plurality of address buses, indeed even those address buses which ensure that a physically remote memory cell is addressed.
This is not sensible for a number of a memory types, including in particular memories which are organized into areas, such as E[rasable] P[rogrammable] R[ead] O[nly]M[emory], E[lectrically]E[rasable]P[rogrammable] R[ead]O[nly]M[emory] or Flash memory. Separation of the address buses into a number of areas and subsequent independent encryption of each of the individual areas is inadequate, however, with regard to security.
Taking as basis the above-described disadvantages and shortcomings and acknowledging the outlined prior art, it is an object of the present invention so to develop a data processing device, in particular an electronic memory component, of the above-mentioned type together with an encryption method related thereto, that on the one hand the security of such devices is increased considerably and on the other hand the expense associated therewith and the technical complexity are not too great.
This object is achieved with a data processing device, in particular an electronic memory component of non-volatile nature, having the features indicated in claim 1 and by an encryption method related thereto having the features indicated in claim 6. Advantageous embodiments and expedient further embodiments of the present invention are identified in the respective dependent claims.
According to the teaching of the present invention, therefore, a completely novel approach to area-wise encryption of memory contents is provided, i.e. a new method is disclosed for encrypting access-secured memory sectors of non-volatile nature and/or other sub-sectors.
To this end, the present invention allows parts of the (address) parameters of the memory areas to be encrypted in different ways with regard to the object and/or with regard to the customer and/or with regard to the “die”. This means, in other words, that some sub-areas or sectors of the address do not affect all the addresses, unlike in the prior art.
According to the invention, therefore, encryption of one access-secured sub-area, in particular an access-secured memory area, is performed while taking account of the other respectively available sub-areas, in particular memory areas. This makes it possible to encrypt each sub-area with in each case different parameters.
According to a preferred embodiment of the present invention, an unencrypted address of the form an, an−1, . . . , a1, a0 may take the following appearance, in accordance with the above-described encryption method: f1(an), f2(f1(an)+an−1), f3(f2(f1(an)+an−1)+an−2), . . . , fn+1,(fn(fn−1( . . . ))), i.e. an unencrypted address of the form an, an−1, . . . , a1, a0 may be mapped onto i=n+1 (scramble) functions fi.
In this context, it is obvious that although variation of the parameter an, in particular of the address parameter, may influence all the other address buses, variation of the parameter an−1 does not have any influence on the most significant function f1(an).
It is expedient for fi(a) to be any desired one-to-one function, i.e. there are precisely 2i plain/cipher pairs, wherein an unencrypted address an, an−1, . . . , a1, a0 is always transformed into a unique encrypted address a′n, a′n−1, . . . , a′1, a′0. On the other hand, the function fi itself does not have to be bijective, i.e. it does not have to be reversible.
In an advantageous further embodiment of the present invention, not all stages have to be fully performed, i.e. some functions fi may directly reproduce the relevant address bit: a′=a. Alternatively or in addition thereto, the address buses may also be grouped; this may appropriately mean, inter alia, that the inputs to the functions fi and the return values from the functions fi may be several bits wide.
In an advantageous embodiment of the present invention,
for EPROM memories or for EEPROM memories division into two sub-areas with functions fi(an, . . . , ax) and f2(f1(ax−1, . . . , a0)) is useful and
for flash memories division into three sub-areas with functions fi(an, . . . , ax), f2(f1(ax−1, . . . , ay)) and f3(f2(f1(ay−1, . . . , a0))) is useful.
According to a particularly inventive further embodiment, access-secured memory areas may be separately secured, i.e. boundary conditions which require a physical memory are fully utilized by the new method (the wide variety of encryptions is here limited only insignificantly).
The present invention further relates to a microcontroller, in particular a smart card controller, comprising at least one data processing device of the above-described type. Accordingly, the above-described method may preferably be built into all smart card designs, for example.
The present invention finally relates to the use of at least one data processing device, in particular at least one electronic memory component, of the above-described type in at least one chip unit, in particular in at least one smart card controller, in at least one reader I[ntegrated] C[ircuit] or in at least one crypto chipset, for example in the field of audio and/or video encryption.
As already discussed above, there are various possible ways of advantageously embodying and developing the teaching of the present invention. Reference is made, in this regard, to the claims subordinate to claims 1 and 6, and the invention will be further described with reference to examples of embodiments shown in the drawings to which, however, the invention is not restricted. In the Figures:
The encryption method according to the present invention for application in an electronic memory component is based on the idea of encrypting unencrypted addresses an, an−1, . . . , a1, a0 of an access-secured memory area only in certain areas, i.e. in dependence on one or more further memory areas, such that encrypted addresses a′n, a′n−1, . . . , a′1, a′0 are formed.
To this end, i=n+1 one-to-one (→2i=2n+1 plain/cipher-pairs) scramble functions f1, f2, . . . , fn, fn+1, are provided, such that, after mapping, the unencrypted addresses of the form an, an−1, . . . , a1, a0 have the following appearance when encrypted by the functions fi (c.f
f1(an), f2(f1(an)+an−1), f3(f2(f1(an)+an−1)+an−2), . . . , fn+1(fn(fn−1( . . . )))
This makes it possible to encrypt each sub-area with in each case different parameters.
In this context, it is obvious that although variation of the addresses an, an−1, . . . , a1, a0 may influence all the other address buses, variation of the parameter an−1 does not have any influence on the most significant function f1(an).
As an alternative to that illustrated in
Furthermore, the address buses may also be grouped; this may mean, inter alia, that the inputs to the functions fi and the return values from the functions fi may be several bits wide.
Number | Date | Country | Kind |
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102 56 587.2 | Dec 2002 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/IB03/05271 | 11/19/2003 | WO | 6/3/2005 |