Securing Record Communications: The TSEC/KW-26 | Search for a title, author or keyword | ||||||||
Securing Record Communications: The TSEC/KW-26 One of the missions of the National Security Agency ( NSA ) is to protect classified information whether in storage, processing, or transit. Collectively, information system security ( INFOSEC ) is the development and application of hardware, software, and doctrine. The “in transit” element, called communications security ( COMSEC ), assures that the underlying information is protected from external exploitation, disruption, or misrepresentation and is available only to authorized recipients. This brochure tells the cradle-to-grave story of highly successful cryptographic equipment for teletypewriter ( TTY ) communications, the TSEC/KW-26 and the people who developed, produced, and fielded it. The changes in communication technology leading up to the introduction of the KW-26 date back to 1907 with the introduction of the Start/Stop method of synchronizing printing telegraph equipment by Charles L. Krumm and his son, Howard Krumm. Each character was assigned a unique five-unit combination of “marks and spaces” preceded by a start element and followed by a stop element. Until that time synchronous printing telegraph systems employed constant length codes, e.g., a five-element Baudot. The new thirty-two possible combinations accommodated the Roman alphabet and six control codes ( upper case, figures, line feed, carriage return, etc. ) and were adopted as an International Telegraph Alphabet #2 (IA#2).
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