3. For a Linear Feedback Shift Register (LFSR) of length L, a. What is maximum p

Question

3. For a Linear Feedback Shift Register (LFSR) of length L, a. What is maximum period of the LFSR output sequence? b. hat is required to obtain a sequence of maximal length? c. What is the linear complexity of a maximal length LFSR output sequence? 4. Describe two methods to produce a binary output sequence using LFSRs with increased linear complexity. 110 110 1 5. Consider the LFSR shown in the diagram above: Using the in tial state indicated, produce the first 40 terms of the LFSR output sequence b. What is the period of the LFSR output sequence? c. Is this maxima

Explanation / Answer

1) Stream cipher:

The Synchronous Stream cipher is kind of stream cipher.In this stream cipher the stream of the key is independently generated for the plaintextThe key stream that is generally produced by using the pseudo random GENERATOR and the parametrized by the key. That is the SECRET KEY of the entire scheme.

2)How do encryption decryption differ in a binary additive synchronous stream cipher.

Both the operations are different in different mode of text i.e ciphertext for decryption and the plaintext for encryption.
A pseudo-random digit’s stream that are generated are combined with the ciphertext for decryption using the XOR operation. And, similarly with plaintext for encryption.

Advantage :- Any data that is corrupted or lost or being damaged can be find out very easily also the synchronous nature of the data are maintained.

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