Hmmm...how long is the single private key of Lotus Notes? Is it time to warm up the key-cracking net again? VTW Billwatch #33 said that:
LOTUS BLINKS IN INDUSTRY/NSA CRYPT STANDOFF ... On Wed, Jan. 17th, 1996, Lotus announced that it had increased the key length of its International version of the Lotus Notes product to 64 bits. They did this by building in a back door for the Administration to use to decrypt any international traffic that it might desire to read.
Although there are a lot of reasons why we think this is a terrible idea, the first one that springs to mind is the fact that the one public key that Lotus has embedded in all their software is a single point of failure for every International Lotus user throughout the world. ... You can find a copy of the Lotus press releases at http://www.lotus.com