Question: Find the key stream & major then encrypt the letter A by using A5/1 method, where the letter is given in ASCII code. The ASCII

Find the key stream & major then encrypt the letter A by using A5/1 method, where the letter is given in ASCII code. The ASCII value for A is 65₁₀ = 1000001_2. (2 clock only)

Clock1:

Keystream =

maj (x8, y10, z10)=

Clock2:

Keystream =

maj (x8, y10, z10)=

Final Keystream =

A5/1 key stream bit:

m = maj (x₈, y₁₀, z₁₀)
if (x₈=m) then X steps
if (y₁₀=m) then Y steps
if (z₁₀=m) then Z steps
s = x₁₈ y₂₁ z₂₂
Go to step 1

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