Cryptography – Cryptanalysis
Patent
1995-08-15
1998-11-10
Buczinski, Stephen C.
Cryptography
Cryptanalysis
360 60, 379 67, H04L 900, G11B 1504, G11B 1904, H04M 164
Patent
active
058355880
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention concerns a digital dictation system with protection against unauthorized listening-in consisting essentially of mobile and/or stationary dictating devices as recording and/or playback devices with the devices for the conversion of analog speech signals and digital data and vice versa and with data storage media in the form of exchangeable storage cards with digital semi-conductor memory.
A chip card, is known in the art from DE 42 28 692 A1 which contains a semi-conductor memory for the storage of digital audio or video signals. In a device for the utilization of this chip card, the analog audio or video signal from the signal source is initially digitized and then introduced into a compression module in order to obtain as long a recording time as possible for a given storage capacity. The publication also refers to a security logic which is realized with the assistance of a processor integrated on the chip card. The publication, however, gives no indication in which manner the information stored on the chip card is secured and through which means an access to the contents of the memory through exchange of the chip card between different recording and playback devices is prevented or rendered possible.
DE 88 10 352 U1 discloses a stationary and mobile dictation device with a statically operated sound recording medium in the form of a chip card, whereby the digital sound recording medium is transferred between a stationary operated playback device and a mobile-operated hand recording/playback device. The publication does not, however, suggest protection of the stored information against unauthorized listening-in.
DE 41 39 197 A1 describes a semi-conductor memory unit for use in connection with a data processing device with which the access to stored data is first enabled when an externally introduced address signal agrees with a security code produced within the memory unit. The publication, however, does not suggest protection against unauthorized listening-in of dictations within a digital dictation system comprising mobile and stationary dictation devices. Furthermore, the mentioned publication does not disclose any possibility for individually encoding semi-conductor memory units so that their association with particular data processing devices or device use groups can be arbitrarily varied.
In the journal "OEP" (Office Equipment & Products) February 1989, page 40, a reference to a digital hand dictating device of the company Sanyo having model designation ICM-1 is given. An IC-card with a static RAM is utilized as a storage medium. There is, however, no indication of listening-in protection for the stored dictation in this publication.
The utilization of an IC-card as a storage building block in an information recording system is known in the art from DE 38 11 378 A1. The IC-card contains a microprocessor, a semi-conductor memory, and a magnetic or optical bulk memory. The access to the bulk memory is secured by address information which is deposited in the semi-conductor memory and can only be read out via the microprocessor. Only with the assistance of this address information is it possible to recall data stored at various storage locations in the bulk memory in the proper sequence. In addition, in order to allow the stored data to only be accessed by particular device users or to be read out only with particular terminals, the semi-conductor memory additionally contains appropriate identification information which is, when recalling data, initially compared to corresponding identification codes which are to be input.
Regardless of the fact that, for the actual storage of data, a magnetic or optical bulk memory is necessary, the described information recording system has the disadvantage of requiring particular security steps from the device user when writing or reading data, which renders operation of the device more difficult. In addition, since the bulk memory is accessible from the outer side of the IC-card, a decoding of the stored data using external
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S. Inoue, OEP Feb. 1989, "Sanyo Looks Toward Digital Voice Recording", p. 40.
Buczinski Stephen C.
Grundig AG
Vincent Paul J.
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