US1868967A - Secret telegraphy system - Google Patents

Secret telegraphy system Download PDF

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Publication number
US1868967A
US1868967A US179440A US17944027A US1868967A US 1868967 A US1868967 A US 1868967A US 179440 A US179440 A US 179440A US 17944027 A US17944027 A US 17944027A US 1868967 A US1868967 A US 1868967A
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series
keys
segments
strip
key
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US179440A
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English (en)
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Cartier Francois
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Individual
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Individual
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/38—Encryption being effected by mechanical apparatus, e.g. rotating cams, switches, keytape punchers

Definitions

  • The. present invention relates to a system of secret telegraphy and has as one of its objects to insure the secrecy of code telegrams transmitted and received by wire or wlreless by converting them into si als which can not be utilized by a crypto ogist for being re-converted into the original signals.
  • transformation is effected at the time of transmission, while the inverse operation takes place on reception by means of a key strip, independently of the operator and 1n an automatic manner.
  • FIG. 1 is a schematic diagram showing the essentials of the Baudot system of telegraphic communication
  • Figs. 2 and '3 are the transmitter and the receiver, respectively, embodying the novel features of my invention
  • Figs. 4 and 5 am detailed views of the keys used on keyboards U and N, respectively, 5 shown in Fig.2;
  • Fig. 6 shows a practicable embodiment of portions shown in Fig. 2;.
  • i Fig. 7 indicates the means for moving the ke ⁇ band or strip;
  • o Fig. 8 is a diagrammatic illustration of a transmitter station;
  • Fig. 9 shows the invention as applied to radiotelegraphio transmission:
  • Fig. 10 shows the invention as applied to radio telegraphic rece tion.
  • FIG. 1 illustrates the essential elements of a Baudot telegraphic communication system.
  • D and D are similar distributors which are divided into segments d and (1 respectively, the number of which is always a multiple of five, one or two being added for synchronism.
  • B and B are brushes which revolve synchronously by sliding, respectively, over se ents d, and d of distributors D and $5: in a way so as to be located always on segments of the same number.
  • 0 is a ke board comprising 5 keys T furnished with two con tacts, one of which, the back contact, touches the bar P connected with the positive pole of a cell, while the other, the working contact,
  • Each keyboard sends out but one letter corresponding to. five signals per rotation of the distributor.
  • the different brushes B and B pass successiveively over the segments al and d, corresponding to the different keyboards or different translators. These arrangements are well known.
  • the transmitter device comprises essentially (see Fig. 2) two adj acentkeyboards U and N the keys K and 100 K of which rock between the two bars A; and A, which are united with the two poles of a cell; a group or bank of five electromagnets, the keepers of which are connected to the five consecutive segments of the distributor D and rock between the two bars P (idle) and P (when a current flows through the correspondin electroma-gnet) the bar P is connected wit the positive pole of a cell S, and the bar P, with the negative pole of a cell 5,; and a brush B which communicates with the line L and which turns uniformly while sliding over the segments of the distributor Di.
  • the keys of the keyboard U have the diaammatic form as indicated in Fig. 4. en idle, aspring R maintains contact between the key and the bar A while when doressed it brings pressure to bear upon the ar a
  • the keys of the ke board N have a form as shown in Fig. 5. n insulatin strip a is placed upon the bar A, thus raising the end m and gressin the other end 1:. upon the bar A T e sai insulating strip is provided with holes.
  • the holes of the insulating strip are separated by intervals or spaces equal to those of the keys K of keyboard N in Fig. 2. They form series of 5 intervals comprising holes of variable number corresponding to the signals or signs or the Baudot five-unit code.
  • Fi 2 corresponds to the case where the letter is manipulated upon the keyboard U and where the holesof the insulating strip a corres 0nd to the letter N.
  • the diagram shows hat in this case, only the second, fourth and fifth of the series of 5 electromagnets J are passed by currents and these cause their keepers to be pressed upon the contacts P Brush 13 by wiping over the corresponding segments or the distributor I) will produce on the line L a sequence of impulses corresponding to the letter J.
  • the letter actually sent out difiers from the one keyed at U ut it depends upon the letter correspon ing to the holes of the insulated strip a, vgiich in the present instant was for letter e
  • the strip is shiited in a way so as to bring anew series or holes under the keys K; or keyboard N
  • the open letter that is manipulated will set us in the line L series of im ulses corresponing to the code letters, tee displace ment oi which with relation to the open-langua letter'varies constantly.
  • the work or coding is eiiected automatically with an tnooherenfi keyas long as there are spaces between the holes on the insulated strip, which may be called the key band or strip.
  • the forward travel or the latter is eflected automatically upon each rotation of the brush B by means of a special electroma net E which is actuated every time the brus passes over a segment of the distributor involved in such forward feed.
  • Fig. 6 represents a practicable disposition of the electromagnets J of the transmitter with their armatures or keepers F connected to distributor D, and contacts P and P,
  • Fig. 7 shows in what way the forward movement of the key band or strip may be controlled by a pawl and ratchet device P.
  • the brush B5 turns in synchronism with the one of the transmitter so that they both pass at the same time over corresponding segments.
  • the group of five electromagnets J 9 controls five keys which come to make contact with A, whenever a current flows through the corresponding electrcmagnet, and with A, when there. is no current flowing.
  • the bank N is analogous to bank N of the transmitter. The same is actuated by a key band identical to the one used insendin
  • the bank U istthe group of relays of't e ,Baudot transa or. s
  • the safety or the cryptographic or secret system described above depends upon the same time to contacts 7N, correspond to the r e length of the key strip which is the only secret element of the system. This secrecy will be practically absolute as long as the number of letters of the assembly of coded text does not exceed from 4 to 5 times the number of intervals of the key strip.
  • Key interrupt-ions may be produced by modifying at the beginning of each message or series of messages the position of the key strip, and there are as many variations or modifications of this nature as there are spaces or intervals in the key band.
  • Fig. 2 If in Fig. 2 the line is doneaway with and if the brush B is joined with the positive pole of the cell S by way of an electromagnet M (shown in Fig. 9) the system is useful for and applicable to radiotelegraphic transmission.
  • the electroniagnet M according to whether it attracts its keeper or not, will cause the sending out of impulses or spaces, that is. either working or idle waves.
  • the working signals received by the antenna may cause the closing of the circuit of a local cell in the relay J (Fig. 10) the receiving system being conveniently disposed for this object, the particular solution and means to be adopted, of course. difiering according to the system of radiotelegraphy that is used.
  • a key board comprising a series of manually operated keys, a second key board having a series of automatically operated keys, a cipher strip for operating said second keys, a series of electromagnets connected in series relation with corresponding keys in each of said key series, a transmitting distributor having a series of collected segments.
  • the keepers or armatures of said electromagnets 5 being connected to a segment of each dis- 7 tributor, and a rotatively mounted brush connected to a line circuit for sweeping over the segments for transmitting electrical impulses resulting from the conjoint action of manual 35 and automatic keys on the electromagnets,
  • a key board comprising a series of manually operated keys for composing desired signals, a second key board having a series of keys automatically operated by means of a perforated key strip, a series of electromagnets, each of said electromagnets connected in series relation with corresponding keys in each of said key series, the relative positions of corresponding keys determining the energization or de-cnergization of the electromagnet associated therewith, a transmitting distribnter having a series of collecting segments, the keepers or armatures of said electromagnets each being connected to a seg ment of said distributor.
  • a rotatively mounted brush contact connected to a line circuit for sweeping over the series of segments whereby electrical impulses, dill'ering from the original manually-keyed signals, are transmitted, and means electrically associated with said segments and brush for advancing said strip one step at the end of each revolution of said brush.
  • a key board comprisinga series of manually operated keys for composing desired signals, a second key board having a series of keys automatically operated by means of a strip, a series of electromagnets, each of which is connected in series relation with corresponding keys in each of said key series, the relative positions of corresponding keys determining the energization of the electromagnets associated therewith, a transmitting dist-ributer having a series of collecting seg ments, each being electrically connected to a corresponding keeper of said electromagnets, a brush contact connected to a line circuit for sweeping over the series of segments whereby electrical impulses, differing from the original manually-keyed signal, are transmitted, a distributer at the receiving station similar to said first mentioned distributer, a rotatively mounted brush contact associated therewith connected to the line circuit and moving in synchronism with the brush at the transmitter a series of relays associated with the distributer and energized by the transmitted electrical impulses, and means cooperating with said relay

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  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)
  • Lock And Its Accessories (AREA)
US179440A 1926-04-23 1927-03-30 Secret telegraphy system Expired - Lifetime US1868967A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1868967X 1926-04-23
FR32851T 1926-08-03

Publications (1)

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US1868967A true US1868967A (en) 1932-07-26

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US179440A Expired - Lifetime US1868967A (en) 1926-04-23 1927-03-30 Secret telegraphy system
US205711A Expired - Lifetime US1767121A (en) 1926-04-23 1927-07-14 Secret-telegraphy system

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Application Number Title Priority Date Filing Date
US205711A Expired - Lifetime US1767121A (en) 1926-04-23 1927-07-14 Secret-telegraphy system

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US (2) US1868967A (it)
BE (2) BE344473A (it)
FR (2) FR628788A (it)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2465367A (en) * 1943-03-12 1949-03-29 William F Friedman System for enciphering facsimiles
US2539556A (en) * 1941-07-11 1951-01-30 Bell Telephone Labor Inc Variable delay speech privacy system
US2552548A (en) * 1943-03-06 1951-05-15 William F Friedman Facsimile enciphering system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE767367C (de) * 1939-05-11 1952-06-19 Lorenz A G C Verschluesselungseinrichtung zur zeitlichen Vertauschung von Fuenfer-Alphabet-Impulsen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2539556A (en) * 1941-07-11 1951-01-30 Bell Telephone Labor Inc Variable delay speech privacy system
US2552548A (en) * 1943-03-06 1951-05-15 William F Friedman Facsimile enciphering system
US2465367A (en) * 1943-03-12 1949-03-29 William F Friedman System for enciphering facsimiles

Also Published As

Publication number Publication date
FR628788A (fr) 1927-10-28
FR32851E (fr) 1928-03-06
BE344473A (it)
BE341583A (it)
US1767121A (en) 1930-06-24

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