DES-X [SEP] designer
to increase the key size of DES without substantially altering the algorithm was DES-X, proposed by Ron Rivest in May 1984.
The algorithm has been included in RSA Security's BSAFE cryptographic library since the late 1980s.
DES-X augments DES by XORing an extra 64 bits of key (K) to the plaintext "before" applying DES, and then XORing another 64 bits of key (K) "after" the encryption:
formula_1
The key size is thereby increased to 56 + (2
and art collector Rolf Stenersen, is one of Korsmo’s most well-known works.
From 1935, Korsmo lectured at the Norwegian National Academy of Craft and Art Industry in Oslo and was professor at the Norwegian Institute of Technology. At the same time he worked as an architect and designer, often with his second wife, designer Grete Prytz Kittelsen. Among his central mission was Norway's pavilion at the Exposition Internationale des Arts et Techniques dans la Vie Moderne (1937) and arranging Norway's participation in Milan X Triennale