資源簡介
Berlekamp-Massey Algorithm 密碼學B-M算法的python語言實現
代碼片段和文件信息
def?Berlekamp_Massey_algorithm(sequence):
????N?=?len(sequence)
????s?=?sequence[:]
????for?k?in?range(N):
????????if?s[k]?==?1:
????????????break
????f?=?set([k?+?1?0])
????l?=?k?+?1
????g?=?set([0])
????a?=?k
????b?=?0
????for?n?in?range(k?+?1?N):
????????d?=?0
????????for?ele?in?f:
????????????d?^=?s[ele?+?n?-?l]
????????if?d?==?0:
????????????b?+=?1
????????else:
????????????if?2?*?l?>?n:
????????????????f?^=?set([a?-?b?+?ele?for?ele?in?g])
????????????????b?+=?1
????????????else:
????????????????temp?=?f.copy()
????????????????f?=?set([b?-?a?+?ele?for?ele?in?f])?^?g
????????????????l?=?n?+?1
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