Still locked up Shannon crypto work?

[Ed Gerck]

"Consider Shannon. He didn’t do just information theory. Several
years before, he did some other good things and some which are still
locked up in the security of cryptography."

Shannon's crypto work that is "still [1986] locked up"? This was
said (*) by Richard W. Hamming on March 7, 1986. Hamming,
who died when he was almost 83 years old in 1998, was then a
Professor at the Naval Postgraduate School in Monterey, California.
He was also a retired Bell Labs scientist.

Does anyone about this or what it could be? Or if Hamming was
incorrect?

(*) http://magic.aladdin.cs.cmu.edu/wp-uploads/hamming.pdf

(BTW, this was a great talk!)

Cheers,
Ed Gerck

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