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EntityQ6120011· pop 9· linked from 103 articles

right|thumb|300px|SIGSALY exhibit at the National Cryptologic Museum

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8 sections
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  • Development
  • Operation
  • Usage
  • Significance
  • See also
  • References
  • Further reading
  • External links

right|thumb|300px|SIGSALY exhibit at the National Cryptologic Museum

SIGSALY (also known as the X System, Project X, Ciphony I, and the Green Hornet) was a secure speech system used in World War II for the highest-level Allied communications. It pioneered a number of digital communications concepts, including the first transmission of speech using pulse-code modulation.

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