DE978000C

DE978000C - Procedure for the secret transmission of spoken messages

Info

Publication number: DE978000C
Application number: DE1959978000
Authority: DE
Inventors: Wilhelm Dr.-Ing. 5480 Oberwinter Göing
Original assignee: Bundesrepublik Deutschland, vertreten durch den Staatssekretär des Bundeskanzleramtes, 5300 Bonn
Priority date: 1959-10-13
Filing date: 1959-10-13
Publication date: 1975-03-13

Description

Eine Gruppe von besonders bewährten Verfahren 55 schlüsseltechnisch brauchbar sind, d. h. noch Sicherzur Verschlüsselung von Telegrafiesignalen hat das heit gegen unbefugtes Abhören bieten, während bei kennzeichnende Merkmal, daß ein Zuordnungs- Telegraficverschlüsselung diese Zeitabschnitte beschema zwischen Klartextsignal einerseits und ver- kanntlich kleiner sein müssen als eine Wortlänge, schlüsseltem Signal andererseits besteht und dieses wenn eine nennenswerte Sicherheit gegen unbefugtes Zuordnungsschema sehr häufig, möglichst nach je- 60 Abhören erreicht werden soll. Dies erklärt sich dardem Zeichen verändert wird. Die häufige Verände- aus, daß den einzelnen Impulszeichen bei einer solrung dieses Zuordnungsschemas und die große Viel- chen Sprachübertragung keineswegs ein so eindeutig falt der an sich möglichen Zuordnungsschemata ge- definierter Sinn zugeordnet werden kann, wie es bei ben diesen Verfahren die ihnen eigene sehr hohe Telegrafiezeichen der Fail ist.A group of particularly proven methods 55 are usable in terms of key technology, i. H. still safe to Encryption of telegraph signals has to offer protection against unauthorized eavesdropping, while with The characteristic feature that an assignment telegraphic encryption scheme these time periods between the plain text signal on the one hand and must be recognizably smaller than a word length, On the other hand, there is a coded signal, and this if there is considerable security against unauthorized persons Allocation scheme very often, if possible after every tap should be achieved. This explains itself Character is changed. The frequent changes from that the individual impulse signs at a solrung this allocation scheme and the large multitude of speech transmission are by no means so unambiguous falt the possible allocation schemes can be allocated to a defined meaning, as is the case with ben these procedures their own very high telegraphic character is the fail.

Sicherheit gegen unbefugtes Abhören. 65 Bei einem solchen erfindungsgemäßen VerfahrenSecurity against unauthorized eavesdropping. 65 In such a method according to the invention

Die einfache Übertragung dieses für die Verschlüs- zur Geheimübertragung gesprochener Nachrichten ist seiung von Telegrafiezeichen bewährten Prinzipes es keineswegs erforderlich, alle in der Sprache vorauf die Verschlüsselung von gesprochenen Nachrich- kommenden Pausen mitzuverschlüsseln. GemäßThe simple transmission of this is for encrypted to secret transmission of spoken messages If telegraphy signs are proven principles, it is by no means necessary to precede all of them in the language Encrypt the encryption of spoken messages as well as pauses. According to

weiterer Erfindung wird daher als vorteilhaft vorgeschlagen, daß Pausen im Sprachsignal, die langer sind, als die bei flüssigem Sprechen zwischen Silben und Worten normalerweise auftretenden, eine Unterbrechung der Aussendung von Impulsen oder die Aussendung eines bestimmten, nur diesen Pausen zugeordneten Impulszeichens bewirken. Während solcher größeren Pausen kann also die verschlüsselnde Steuerfunktion stillstehen, so daß der Speicherbedarf zu ihr« Speicherung weiter reduziert werden kann.further invention is therefore proposed as advantageous that pauses in the speech signal that are longer than those when speaking fluently between syllables and words normally occurring, an interruption in the transmission of pulses or the Send out a specific pulse signal that is only assigned to these pauses. During such So the encrypting control function can stand still for longer pauses, so that the memory requirement to her «storage can be further reduced.

Damit werden dem unbefugten Empfänger zugleich weniger Handhaben zur Feststellung von Zuordnungsschema und Steuerfunktion gegeben. Die normalen kurzen Pausen dagegen werden mitverschlüsselt, so daß der für den gesprochenen Text charakteristische Energierhythmus sehr wohl mitverschlüsselt ist und vom unbefugten Empfänger also nicht feststellbar ist.This means that the unauthorized recipient is less likely to have to deal with the determination of Allocation scheme and control function given. The normal short pauses, on the other hand, are encoded, so that the energy rhythm characteristic of the spoken text is also encoded and cannot be detected by the unauthorized recipient.

Die Anwendung der Erfindung und ihre Weiterbildung ermöglicht es, ein bei der Übertragung telegrafischer Nachrichten bewährtes Verschlüsselungsprinzip auf die Übertragung gesprochener Nachrichten anzuwenden, ohne daß dabei ein außerordentlichThe application of the invention and its development enables a telegraphic transmission Messages: a proven encryption principle for the transmission of spoken messages apply without doing an extraordinary

ίο großer anlagenmäßiger Aufwand erforderlich wäre. Der von der Telegrafieverschlüsselung her bekannte ausschlaggebende Vorteil einer sehr hohen Abhörsicherheit dieses Prinzips bleibt bei der Anwendung der Erfindung durchaus erhalten.ίο great effort in terms of equipment would be required. The decisive advantage of a very high level of security against eavesdropping, known from telegraphic encryption this principle is retained when the invention is used.

Claims

ten being the language by a corresponding

Claims: modulation arrangement initially in discrete pulses

is converted, but must have very considerable technical

J. Method for secret transmission of spoken word entails difficulties. The changing messages using a coding principle that assigns discrete pulses to the encoded speech signal is characteristic of a type of modulation in which the modulation pre-control function is controlled which is taken from a memory corridor's own allocation scheme between language. Because only in this way is a synchronous signal on the one hand and pulse signal on the other hand running between the encryption device on the one hand and changeable, thereby marked decryption device on the other hand. ::> t mognet that this allocation scheme only borrowed. Corresponding to the time segments, which are determined by several Gw and which are larger than a larger message flow of languages compared to the average word length, is changed. Telegraphy then results in the storage 2. Method for secret transmission of spoken control function such a large memory requirement of the chener messages according to claim 1, characterized technically hardly or only with a very large amount of pauses in the speech signal, the wall can be realized .

longer than when speaking fluently between- Using the knowledge that despite external

between words or words normally show more similarity to those from the speech signal through the tendency, an interruption in the transmission of IM pulses derived from the modulation method used or the transmission of a specific 20 pulse with the pulses from Telegrariezeicnen Zwinur The impulse signs associated with these pauses see both types of signs nevertheless quite essential cause. There are differences, the invention shows a

Way to get around these difficulties.

The invention relates to a method for secret

25 Transmission of spoken messages using a pulse that is discrete to the speech signal

There are suitable assignable modulation types for the transmission of speech, in which the Mo modulation types known and common, the allocation scheme between the dulation process assign discrete pulses to the transmitted signal. see voice signal on the one hand and pulse signal on-over the actual message path can in turn be changed, and the special ones only in advance Simple impulses are transmitted, i.e. characters that are divided into parts by assigning them Simplicity are similar to telegraphic signs. scheme only after certain periods of time, the Now if the task is to find such an over- are larger than an average word length, transmission path for spoken messages is changed by a.

Encryption to prevent unauthorized eavesdropping. 35 By modulation arrangement and encryption, it may therefore seem obvious to combine such an encryption arrangement into one To apply the selection process, which in itself is for part of the uniform arrangement, a ratio graph results are known and in use, provided they have the moderately low cost of circuitry to transmit significantly higher message flow for such a system. The modulator is not one allow, in particular, the order of magnitude 40 special key downstream, but it is If the pulse frequency is higher, an encoding modulator is used, whereby the can. So is a procedure for secrecy of the control function of the encryption on the Modula language, which acts directly by means of a very specific im- tor. By the fact that the time segments pulse modulation method, namely the so-called between two consecutive change-pulse-code method, is transmitted via message transmissions of the allocation scheme proportionally management channels, it has become known which are large - they not only include several ches with emphasis on the analogy to telegraphy characters, but each a very large number of Transmission suggests that the assignment between telegraphy-like impulse characters - is required quantized speech amplitudes and the Im- borrowed storage capacity for storing the control pulse code combinations The transmitter and receiver function relatively low and can be changed in a consistent manner without a catcher. Exceptional technical effort is involved target. After that it should simply be a for telegraphy. It has been shown that periods of known method is applied to pulse-coded speech more than a word length between two each other will. following changes to the allocation scheme