字都能被移动,而空出的位置又被其他數字填充。当向右移动时,最左边的位置依舊保留原有位置的數值。 Thomas R. Cain and Alan T. Sherman. "How to break Gifford's cipher". Section 8.1: "Sticky versus Non-Sticky
Mutually Suspicious Groups. [2021-10-11]. (原始内容存档于2022-06-10) (英语). Alan T. Sherman, Farid Javani, Haibin Zhang, Enis Golaszewski. On the Origins and Variations
Renfree (1955–1970) Bob Hutchison (1970–1975) Alan Neaves (1975–1979) Brian O'Donovan (1979–1983) Tom Sherman (1983–1989) Stephen Skehill (1989–1990) John