Fish stock (food) Fish stock (food) Fish stock forms the basis of many dishes, particularly fish soups and sauces. In the West, it is usually made with fish bones and fish heads and finely chopped mirepoix. This fish stock should be cooked for 20–25 minutes—cooking any longer spoils the flavour. Concentrated fish stock is called "fish fumet". In Japan, a fish and kelp stock called dashi is made by briefly (3–5 minutes) cooking skipjack tuna (bonito) flakes called "katsuobushi" in nearly boiling water. Other Japanese fish stock is made from fish that have been fried and boiled for several hours, creating a white
Skipjack (cipher) for US government applications. Skipjack uses an 80-bit key to encrypt or decrypt 64-bit data blocks. It is an unbalanced Feistel network with 32 rounds. It was designed to be used in secured phones. Eli Biham and Adi Shamir discovered an attack against 16 of the 32 rounds within one day of declassification, and (with Alex Biryukov) extended this to 31 of the 32 rounds (but with an attack only slightly faster than exhaustive search) within months using impossible differential cryptanalysis. A truncated differential attack was also published against 28 rounds of Skipjack cipher. A claimed attack against the full