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The Puzzle at CIA Headquarters: Cracking the Courtyard Crypto
David D. Stein, 1999. Studies in Intelligence 43(1), CIA.
The CIA analyst's own account of solving K1 to K3 by hand over about 400 hours from 1991 to 1998, with the editor's note on the commission and Scheidt's role. Released and posted by the National Security Archive.
What it's used for here
Primary account of the first public solution inside the CIA and of how the sculpture was made.
The document 11 pages
Cited by on this site 6 records
FIG
Kryptos
MYSThe mystery article
Cite it
Stein, D. D. (1999). The Puzzle at CIA Headquarters: Cracking the Courtyard Crypto. Studies in Intelligence 43(1), CIA. https://nsarchive2.gwu.edu/NSAEBB/NSAEBB431/docs/intell_ebb_010.PDF
@article{stein1999courtyard,
author = {Stein, David D.},
title = {The Puzzle at CIA Headquarters: Cracking the Courtyard Crypto},
journal = {Studies in Intelligence 43(1), CIA},
year = {1999},
url = {https://nsarchive2.gwu.edu/NSAEBB/NSAEBB431/docs/intell_ebb_010.PDF}
}TY - JOUR TI - The Puzzle at CIA Headquarters: Cracking the Courtyard Crypto AU - Stein, David D. PY - 1999 JO - Studies in Intelligence 43(1), CIA UR - https://nsarchive2.gwu.edu/NSAEBB/NSAEBB431/docs/intell_ebb_010.PDF ER -
Stein, David D.. “The Puzzle at CIA Headquarters: Cracking the Courtyard Crypto.” Studies in Intelligence 43(1), CIA (1999).