Jim Sanborn’s Complete Kryptos Archive Sells for $962,500 at Auction
Kryptos archive sheds new light on the world’s most famous unsolved CIA code
BOSTON, Mass. — Nov. 21, 2025 — The complete secrets of Kryptos — including the long-anticipated K5 connection and the original K4 coding system that underpins the sculpture’s unsolved passage — from artist Jim Sanborn’s private archive sold for $962,500 at RR Auction’s “Decoding History: Kryptos K4 & K5, Enigma, and the Rosetta Stone” sale on Thursday evening.
The single comprehensive Kryptos archive included Sanborn’s handwritten plain text of K4; the original K4 coding system; the unpublished 1988 alternate K1 plain text and coding chart; the unpublished 1988 alternate K4 plain text and coding chart now known as K5; handwritten and signed screen-cutting plain texts; the original scrambled texts shown to the Department of Historical Intelligence; and the original coding charts used to create the K1–K3 passages. The lot also featured Sanborn’s CIA-issued “Escort Required” badge, a signed proof-of-concept copper plate, and a selection of archival photographic materials documenting the creation of the sculpture.
The winning bidder will additionally receive a private afternoon with Sanborn, who will personally walk through the codes, charts, and artistic intent behind K4 and K5.
An anonymous buyer has secured the Kryptos archive and is preparing a long-term stewardship plan. Details will be shared when available.
Installed in 1990 on the grounds of CIA headquarters, Kryptos is one of the most famous unsolved codes in the world. While K1–K3 were solved in the 1990s, K4 remained a mystery for more than 35 years. Sanborn’s archive provides the first complete explanation of how the passage was constructed and how it connects to the long-rumored K5.
“This sale represents one of the most significant transfers of cryptographic knowledge in auction history,” said Bobby Livingston, Executive Vice President at RR Auction. “The winning bidder will possess what the CIA, NSA, and thousands of codebreakers worldwide have pursued since 1990, the complete encryption methods and solutions to K4 and K5 that reveal Sanborn’s entire encrypted masterpiece.”
AUCTION HIGHLIGHTS
Enigma I Military-Issue Cipher Machine (c. 1933) sold for $412,481
Enigma I Cipher Machine (1943, Panzerholz Case, Fully Functional) sold for $343,645
Rosetta Stone: Archive of Early 19th-Century British Working Papers sold for $113,799
The auction realized a total of $1,947,111. Prices include buyer’s premium.
RR Auction’s “Decoding History: Kryptos K4 & K5, Enigma, and the Rosetta Stone” opened Oct. 16 and closed Nov. 20. Full results are available at www.rrauction.com.
