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Crypto chip / The Codestar module add-on board

Obraz
The CodeStar module was designed for encryption and decryption of information for personal computers. The board was inserted into a free computer slot and occupied one 8-bit bus slot of a PC, XT, AT class computer. The module was supplied with a floppy disk with files in the Turbo C++ language under the MS-DOS OS . The original CRY 8 customer circuit, based on reliable technology had the entire information encryption and decryption algorithm hidden. This algorithm ( Feistel -type algorithm) was developed and manufactured in Switzerland for reliability on a special order basis, together with a semi-custom integrated circuit using CMOS VLSI technology. The order was placed by the Institute of Computer Systems of the Slovak Academy of Sciences (today‘s Institute of Informatics SAV ). The module was used to encrypt and decrypt the user's information or the user's entire file with an original and constantly changing key, it served to protect the user's data from unauthor...
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CS ciphers used in WWII (1939-1945)

CS ciphers used in WWII (1939-1945) Mr. Jozef M. Kollár ’s series of articles about the Czech codes, used in WWII, from past e-zine Crypto-World. They are: Cipher‘TTS’ Cipher’Rimska dva’ Cipher‘Rimska osem’ Cipher‘Rimska devat’ Cipher‘Rimska desat’ Cipher‘Rimska trinast’ Cipher‘Eva’ Cipher‘Marta’ Cipher‘Ruzena’ Cipher‘Utility’ Cipher‘Palacky’ Another article about czechoslovakian cipher TTS from WWII, published in Crypto-world 1-3/2014: Czechoslovakian cipher TTS and it's solution  Mr. J.M. Kollar's presentation in pdf format, about czechoslovakian ciphers used in WWII: CS ciphers used in WWII In slovak: Predbežnú verziu prednášky J.M. Kollára o ČS šifrách v WW2 nájdete tu prezentacia01_Kollar.pdf Professor Otokar Grosek and M. Vojvoda, P. Zajac's Powerpoint presentation about CS ciphers used in WWII, with detailed explanation of German SIGINT solution and pictures from Mr. Jiri Janecek's books. Lecture No. 6 PP...
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Military Ciphers according to cpt. Frybort

Obraz
Article about military ciphers by cpt. Bedřich Frýbort, in "Vojenský svět", 1937, 11 and 12, vol. V. I. part, pp. 438-9, II.part: pp. 479-80, Title of the article in czech: "Šifrování": etc... Content of the article is probably about basic cipher systems used in military exercises in Czechoslovakia. Member of the group C of cipher solutionists at Czechoslovak HQ of the Ministry of Defence headed by lieutenant colonel  Josef RŮŽEK , in czech:"člen šifrové skupiny C HV MNO", according to Porubský, Š.: Application and Misapplication  of the Czechoslovak STP cipher during WWII (report on an unpublished manuscript) . In: Tatra Mountains Mathematical Publications , vol. 70, no. 3, p.47
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