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src/s/a/sage-HEAD/src/sage/crypto/stream.py   sage(Download)
 
from cryptosystem import SymmetricKeyCryptosystem
from stream_cipher import LFSRCipher, ShrinkingGeneratorCipher
 
from sage.crypto.util import random_blum_prime
        if not isinstance(e1, LFSRCipher) or not isinstance(e2, LFSRCipher):
            raise TypeError("The key (= (%s,%s)) must be a tuple of two LFSR ciphers." % key)
        return ShrinkingGeneratorCipher(self, e1, e2)
 
    def _repr_(self):