[cryptome] NSA IDA Cryptological Research Centers

  • From: John Young <jya@xxxxxxxxxxxx>
  • To: cypherpunks@xxxxxxxxxx,cryptography@xxxxxxxxxxxxx,cryptome@xxxxxxxxxxxxx
  • Date: Sun, 29 Sep 2013 09:43:54 -0400

The Institute for Defense Analyses, based in Alexandria, VA,
is a 50-year partner of NSA. It has two Centers for Communications
Research at Princeton, NJ, and La Jolla, CA, both doing cryptological
research for NSA:



The latter's web site lists only this offering:


La Jolla Covering Repository

A (v,k,t)-covering design is a collection of k-element subsets, called blocks, of {1,2,...,v}, such that any t-element subset is contained in at least one block. This site contains a collection of good (v,k,t)-coverings. Each of these coverings gives an upper bound for the corresponding C(v,k,t), the smallest possible number of blocks in such a covering design.

The limit for coverings is v<100, k<=25, and t<=8 just to draw the line somewhere. Only coverings with at most 100000 blocks are given, except for some which were grandfathered in. Some Steiner systems (coverings in which every t-set is covered exactly once) which are too big for the database will be included in the link below.


What is "covering" and how does it related to cryptology?


Eyeballs of the two centers:


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