Using the simplified RC4 Algorithm of 8 bytes (rather than the full 256 bytes), find the final Keystream and Cipherpext of the following Input string: S-Array of length 8, [S0 S1 S2 S3 S4 S5 S6 S7] = [0 1 2 3 4 5 6 7] Key, K = [3 1 4 1 5] Plaintext, PT = [6 1 5 4] Hint: For the simplified stream generation, you can use this pseudocode (only up to the PT length): /* Initialization */ set i and j = 0 for i = i + 1 to length of PT        j = j + S[i] mod 8        swap S[i], S[j]                            t = S[i] + S[j] mod 8        Keystream = S[t] end for

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
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  1. Using the simplified RC4 Algorithm of 8 bytes (rather than the full 256 bytes), find the final Keystream and Cipherpext of the following Input string:

S-Array of length 8, [S0 S1 S2 S3 S4 S5 S6 S7] = [0 1 2 3 4 5 6 7]

Key, K = [3 1 4 1 5]

Plaintext, PT = [6 1 5 4]

Hint: For the simplified stream generation, you can use this pseudocode (only up to the PT length):

/* Initialization */ set i and j = 0

for i = i + 1 to length of PT

       j = j + S[i] mod 8

       swap S[i], S[j]

                           t = S[i] + S[j] mod 8

       Keystream = S[t]

end for

 

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