DE1017646B - Electronic device for the encryption and decryption of telex characters - Google Patents

Description

GERMAN

The invention relates to electronic devices for encryption and decryption of telex signals.

It is known that the encryption and decryption of typewriter signals thereby it can be made that firstly the sent message is combined with at the sending end the letter of a stored key and that at the receiving end in a similar way the the received encrypted message is combined with a second storage of the same key, whereby the message is decrypted and the original message is re-created. The combination the message and the key can be executed in such a way that the binary code elements each Adding letters is what is called "false addition", e.g. the same polarity gives a stream of characters and different polarity separating current. Electro-mechanical methods are generally used to carry out the combination just mentioned. The electromechanical method requires the use of an automatic transmitter that works on the start-stop principle and with a teletype signal is in synchronism. This method makes the use of a motor with a speed controller, a clutch and an electromechanical start-stop device are necessary. All of these parts are highly subject to wear and tear and therefore require maintenance by trained personnel.

The use of a motor with a speed controller, clutch and electromechanical start-stop device is avoided in the invention. This is done by using an electronic Device for the encryption and decryption of telex characters with a pulse source and binary Reached counting circuits in which each character of a telex plaintext is combined with the corresponding one Characters in the binary code of a ciphertext to generate an encrypted character, and in which an encrypted character is combined with the corresponding key character, to get the plaintext characters back. This electronic device is according to the invention in characterized in that a start-stop pulse source, binary counting circuits and a matrix cooperate in such a way that they are synchronous with the plaintext or encrypted line characters as a function of generate impulses from the start impulse of these characters for a scanning device, which the Scans key characters on a punched tape, and that this key character in a control circuit is combined with the plain text or encrypted line characters.

Electronic device

for encryption and decryption

of telex characters

Applicant:
Standard Telefon og Kabelfabrik A / S., Oslo

Representative: Dipl.-Ing. H. Ciaessen, patent attorney,
Stuttgart-Zuffenhausen, Hellmuth-Hirth-Str. 42

Claimed priority:
Norway January 18, 1954

Kaare R. Meisingset, Stabekk (Norway),
has been named as the inventor

Another advantage of the invention is achieved through the regeneration of the signals through combination of the. already mentioned signals with trigger pulses in the middle of the code elements to a flip-flop circuit control that gives the output signal without distortion.

An embodiment of the invention will be explained in more detail with reference to the drawings, FIGS. 1 to 9 will.

The teletype signals are given on line 11 (Fig. 1) and to a start-stop circuit 1, which starts or stops a pulse source 2 via a connecting line 12. This source of impulse can e.g. B. consist of a start-stop oscillator, an amplifier and a differentiating network to generate suitable impulses. the Pulses originating from the pulse source pass via a connecting line 13 to a counting circuit 3, which can consist of a number of binary counters. The connection 14, which is a multiple connection from the flip-flop device is in the counting circuit, a matrix 4 controls this matrix 4 sends pulses to the scanner 5 over a number of parallel links 15. The scanner 5 scans the key signal, which is located in a perforated teleprinting strip 25 can. The scanning signal is fed to the circuit 6 via the connection 16. The incoming signal is led to this circuit 6, which produces the necessary combination of "false addition". The combined signal is received on connection 61.

709 756/163

3 4

Fig. 2 shows another arrangement in which pulses are required to restore the idle state.

compared to FIG. 1, the matrix 4 and the scanning range, while only seven complete pulses of

device 5 are arranged differently, so that the oscillator can be obtained.

tactile signal from the miter 4 is received. Each flip-flop tube FIl, F12 and F13 im Fig. 3 shows a block diagram similar to Fig. 1, in 5 binary counter is arranged to be symmetrical

but the Im generated by the pulse source 2 only by negative pulses that are applied to both grids

pulse via the connecting line 26 to which power can be applied, triggered or unsym-

circle 6 are fed. The output of the Strom- metric by positive pulses to the grid of the

circle 6 is a flip-flop circuit 7 on the non-conductive tube part.

Connection 17 fed, which restored io If the amplifier tube VlOB so biased

Signals. is that it has an output waveform (curve B ₃

The incoming signals are sent to the grid Fig. 9), the first counter stage is Fi%; if | ttrch

placed in a tube VlA . This signal can be zero which triggered the negative pulse of the amplifier tube.

or positive for character stream and negative for separating The second counting stage F12 is given by negative fm »stream. The tube F IA is conductive during the time 15 pulses of the right tube part of the first counting stage _:

of the character stream and non-conductive during the triggered. The third counting stage F13 is

Duration of the separating current. The incoming signals, tive impulses of the right tube section of the

d. H. Single or double stream characters are triggered at the second count level.

strengthens and vice versa through the tube F IA and on the outputs of the anode circuits of the flip the line 11 given, which via a DC 20 flop tubes of the binary counter are led to a rectifier ST? 6 to the start-stop circuit with the die, which contains the rectifier SR7 to tubes F14 and F15 (Fig. 4) and to the grid of an SR14 . The rectifiers are connected to one another. Tube Fl B (Fig. 5) leads the tube circuit. tied and biased in such a way that the tubes V 14 and F15 (Fig. 4) form a one-positive rectangular pulses "0", "1", "2", "3", "4", stepped multivibrator, in which pipes F15 25 »5«, »M«, »iT« through ST? 7, ST? 8, SR 9, ST? 10, SR 11, is normally conductive. The reinforced input SR 12, SR 13 and ST? 14 can be generated. A positive signal with reverse polarity is sent to the grid pulse is passed through the rectifier ST? 7 to ST? 14 of the tube F14, so that this tube only becomes conductive when the three associated anodes become, and this triggers the multivibrator, the flip-flop tubes are positive at the same time, so that the tube F15 becomes non-conductive. The output 30 The "O" pulse is applied to the scanning device via 15 a of the tube F15 controls an oscillator control tube F8.

which in turn controls a stop tube F9, whose pulses "1" to "5" correspond to the five outputs leads to a pulse source which is an element of a teletype code, and these pulses start-stop time oscillator tube V10A and a ver are derived from includes the following pulses of the stronger tube VlOB. The time constant of the 35 amplifier tube FlOi ?. These five pulses are multivibrator is chosen so that this device returns to the normal state to the scanning device via a multiple connection (tube F15 conductive) after dung (15 b to 15 /) out. , V a period, the duration of which is seven code elements. The »JW« pulse, magnetic pulse, is fed to a Verentspricht, stronger tube F7, which controls a switching magnet and F15) is placed amplifier tube F 7 (Fig. 7). it blocks the stop current flowing through the tube F9 The "//" pulse flowing from the rectifier SR 14. The impedance of the tube is stirred up, has a duration of one complete cycle, eight ohms, and the oscillator starts to oscillate immediately. It is counts, and is achieved as a hold pulse for the oscillation by this circuit that the stop current 45 gating tube F8 (Fig. 4) is used, so that the multivibrator which is made up of tubes F14 and F15 is always of the appropriate magnitude through the tube when the multivibrator returns, it can be put out of action. The initial state of the oscillator at the swing holding pulse »H« is then prevented via a reverse ring. placed on the grid of the oscillator control tube F8. The waveform of the output voltage of the start 5 ° The scanning device, which is shown schematically in the stop oscillator tube V10A, is sinusoidal, and FIG. 7 is an electromechanical device, the first half-wave is positive. The duration of a full The key strip is switched forward by a switching magnet constant period is equal to the duration of a code SM. The scanning device for elements. The output from the start-stop oscillator strip is not shown. The upper contacts torotube is shown in Fig. 9 by the curve A - 55 are closed for drawing elements and the lower ones. . Contacts for isolating current elements. All conacts The sinusoidal oscillation of the tube F 10 ^ 4 is shown by are in the character stream position. The five amplified the amplifier tube VlOB . The output contacts give a five-element teletype code the tube is sent to the first stage of a three-step again.

binary counter that comes from the flip-flop tubes 60 The pulses for character stream are with the

FIl, F12 and F13 (Fig. 6). "0" pulse from the rectifier SR7 combined

The tube F10 B and a control circuit are supplied by appropriate biasing,

it is possible to get an output wave that is in The pulses for isolating current are the line

of Fig. 9 is represented by the map B , or 16 supplied, which to the control circuits

a wave as shown by curve C. 65 lead.

In the latter case it is necessary to have a special control circuit (6 in Fig. 1 to 3),

To feed the counting pulse to the binary counter , for example, as can be seen from FIG. 5, from two reversals ^ and

wise from an amplifier or a modulator amplifier tubes V2A and F 2 B for the scanning signal, '

control circuit tube. This is necessary to use an amplifier tube Fl B for the incoming

because the three-stage binary counter has eight triggering 70 signal, a mixed circuit that consists of the

judge units SRI, SR2 and SRZ is composed and two amplifier or modulator tubes VZA and VZB.

The input signal with reverse polarity of the tube VlA is applied to the rectifier SRI , directly and also via the tube VlB to the same rectifier. The scanning signal from the scanning device reaches the rectifier SR 2 via the line 16, via the tube V2A . The output of the tube V2A is also applied to the rectifier SR 2 via the tube V2B. The outputs of the mixer circuit lead to the grids of the amplifier tubes VZA and VZ B ; the outputs of these tubes lead to a flip-flop circuit which contains a double tube F 4. This flip-flop device is not shown in circuit diagram 1 because it is not absolutely necessary. The output can be taken directly from one of the anode circuits of the amplifier tubes VZA and VZB .

In order to obtain a more precise time counting, a connection 26 can be established between the pulse source 2 and the control circuit 6, as can be seen from FIG. 3. This connection is shown as a dashed line in Figs. 4 and 5 and connects the anode circuit of the amplifier tube FlO B and the capacitors C 1 and C2 in Fig. 5, which are located on the grids of the tubes VZA and VZB . The time counting pulses are superimposed on the output signals of the mixer circuit SRI to SRZ. In this case the tubes VZA and VZB serve as modulators, and the grid bias potential is selected so that the tubes only become conductive when a positive time counting pulse is superimposed on a positive element of the output signal from the rectifier SRZ of the mixer circuit. The output signals of the mixer circuit are in opposite phase to one another, and the tubes VZA and VZB are therefore only conductive once at a time. The output from each of these tubes, functioning as modulator tubes, is in the form of negative pulses of very short duration, which correspond to the time counting pulses. These output pulses are applied via the lines 17 a and 17 & to the flip-flop circuit, which the double tube V4. contains.

The flip-flop circuit consists of a two-stage, directly coupled amplifier. The circuit has two idle states. When a negative pulse to the grid of the conductive part of the double tube is applied, there is a rapid transition to the other idle state. The grid of the non-conductive Negative pulses applied to the triode have no effect.

The first negative pulse from the anode circuit of the tube VZA will disconnect the anode circuit of the left part of the double tube V 4. The corresponding anode becomes positive and a positive pulse is applied to the grid of the right part of the double tube V 4. The following negative impulses from the anode circuit of the tube VZA have no influence as long as the right part of the double tube is conductive. The first following negative pulse from the tube VZB will, however, extinguish the flip-flop circuit and bring it into the first idle state.

In this way, the flip-flop circuit converts the message contained in the pulses of the anode circuits of the tubes VZA and VZB into direct current square-wave pulses that correspond to the telegraph letters and result from the combination of two signals from the mixer circuit. The time count is entirely determined by the start-stop oscillator and the output signal from the flip-flop circuit is therefore restored when the dotted connection 26 is present. The inversion that was present in the input signal is thus fed back again.

As previously discussed, the intensifier tube V 10 B of FIG. 4 can be biased so that the output corresponds to curve C of FIG. If this is the case, an initial counting pulse can be obtained from the anode circuit of the tube VZA , and this pulse can be applied via a control circuit to the grid of the left tube of the first binary counting stage. If the multivibrator, which consists of the tubes V 14 and V 15, is switched off from the circuit and the stop pulses "H" are applied to the grid of the oscillator control tube V8 via an inverted tube, the same inverted tube can be used as the control circuit for the initial counting pulses. which are fed to the counting stage. In this case, the SR7 generates a "V2" pulse instead of an "O" pulse. The "V2" pulse corresponds to the second half of the first teletype code element.

Curves A, B and C (FIG. 9), which have been mentioned in connection with the explanation of the oscillator (VIA, FIG. 4), show the oscillator output in curve A. Curve B shows the output of the amplifier when no initial count is desired. Curve C shows the output of the amplifier when an initial count is used. Curve D denotes an incoming signal and curve E a key signal. These signals are combined in the control circuit (6, FIGS. 1 to 3) and produce an output signal F. With a suitable bias of the tubes VZA and VZB (FIG. 5), the output of these tubes corresponds to curve C (FIG. 9), and at connection 26 (Figs. 4 and 5) the restored signal appears and a restored output signal G is generated. The only difference between curves F and G is that the latter is delayed by a time element which is half the size of a teleprint code element. From these curves it can be seen that a combination of character stream and character stream or separating current and separating current gives character stream and that separating current and character stream or character stream and separating current gives separating current, as already in connection with the explanation of the mixing circuit (SRI to SRZ, Fig. 5) dealt with.

Claims (2)

Claims ·. 1. Electronic device for encryption and decryption of telex characters with a pulse source and binary counting circuits in which each character of a telex plaintext is combined with the corresponding character in the binary code of a ciphertext to generate an encrypted character, and in the a The encrypted character is combined with the corresponding key character to make the plaintext character regain, characterized in that a start-stop pulse source, binary Counting circuits and a matrix interact in such a way that they are synchronous with the plain text or encrypted line characters depending on the start pulse of these characters pulses for a scanning device, which the Scans key characters on a punched tape, and that this key character in a control circuit is combined with the plain text or encrypted line characters. 2. Electronic device according to claim 1, characterized in that the die is a Control pulse generated to move the key strip to the next letter in the scanner to be transported further. Considered publications: German patent specifications No. 856 608, 855 876. For this purpose 2 sheets of drawings