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Definition of "stream cipher" |
an encryption system or cipher in which the information symbols comprising the plaintext are transformed into ciphertext individually. An important property of a stream cipher is that like-valued plaintext symbols are not necessarily transformed into the same ciphertext. A stream cipher normally acts in an additive sense and in the case of bits being encrypted, the information bits Xn are added modulo-2 to the bits, Zn, generated by the so-called running-key generator. The ciphertext Yn is therefore given |
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