Das DDR-Chiffriergerät T-310

Killmann, Wolfgang; Stephan, Winfried

doi:10.1007/978-3-662-61897-4

Cited by 3 publications

(5 citation statements)

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“…The strength of the cipher algorithm is the absolute necessary condition for the strength of the cipher (but as we see later not the only one). The cipher algorithm T-310 is defined in (Killmann and Stephan, 2021;Killmann, 2023). The T-310 is a stream cipher as a symmetric encryption system combining a sequence of teletype characters with the keystream by one character at a time, using a invertible function (like XOR).…”

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

“…The T-310 is a stream cipher as a symmetric encryption system combining a sequence of teletype characters with the keystream by one character at a time, using a invertible function (like XOR). The structure of the cryptographic module is depicted in Figure 2 (Killmann and Stephan, 2021).…”

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

“…The complication unit is the core of the algorithm T-310. It implements a nonlinear shift register with the transition function ϕ of the states U as depicted in Figure 3 (Killmann and Stephan, 2021).…”

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

“…The specialists of the ZCO analyzed deeply the function ϕ depending on the long-term keys. The ZCO applied a procedure for the approval of longterm keys intended for application in the field (Killmann and Stephan, 2021;Killmann, 2023). These carefully selected long-term keys allowed to prove important security features of the cipher.…”

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

“…It can also be used for encryption of another text imitating an authorized cipher station. If three such ciphertexts are intercepted and two corresponding plaintexts are known (or guessed) then the third plaintext may be determined independent on the strength of the keys and the complica- (Killmann and Stephan, 2021;Stephan, 2022). The countermeasures against such attacks are (1) the generation of the initial vector by means of strong random number generators (Section 5.1), and (2) the robust cipher procedure preventing the encryption with an untrustworthy initial vector (Section 6.2).…”

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

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The History of the Development and the Analysis of the Cipher Machine T-310/50 and the Procedure ARGON by the ZCO

Killmann¹

2023

Linköping Electronic Conference Proceedings

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This paper describes important aspects of the 10 years of development and the 18 years of security analysis of the cipher machine T-310/50 and the procedure AR-GON by the Central Cipher Authority of the GDR. The threat model of the analysis is pictured. Examples of the security analysis of the cipher algorithm, machine, procedure and key management are provided. The focus is on the analysis of the operating functions of the T-310/50 (operating analysis), including the analysis of operating errors, as well as the analysis of the instruction manual for the cipher procedure ARGON. The possibilities of obtaining information by an attacker from traffic reconnaissance in general and decryption attacks in particular are assessed.

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Section: The Cipher Algorithm T-310mentioning

confidence: 99%

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

Section: The Cipher Algorithm T-310mentioning

confidence: 99%

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