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@@ -1,4 +1,4 @@
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1) **Choose a short phrase of between 50-60 characters. You could choose a website headline, song title, etc. Convert this phrase using Caesar shift encryption and a key of 5 to create your ciphertext. Carry out a cryptanalytic attack to try to work out the decryption key and plaintext. (10 marks)**
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1. **Choose a short phrase of between 50-60 characters. You could choose a website headline, song title, etc. Convert this phrase using Caesar shift encryption and a key of 5 to create your ciphertext. Carry out a cryptanalytic attack to try to work out the decryption key and plaintext. (10 marks)**
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F1 veteran to retire and take up new role in 2024.
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@@ -26,7 +26,7 @@ This results in a key of 5, so translating the 2nd word: ajyjwfs -> veteran. Thi
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`K1 ajyjwfs yt wjynwj fsi yfpj zu sjb wtqj ns 2024.` -> `F1 veteran to retire and take up new role in 2024.`
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2) Computer A sends 5 packets of data to computer B using Sliding Windows Flow Control.
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1. Computer A sends 5 packets of data to computer B using Sliding Windows Flow Control.
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- The transmission time (time to put on the network) for a packet of data is 1 'time units'
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- Transmission time for an acknowledgement is 0 ‘time units’ (they are very small)
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- The propagation time (time to travel through network) for any transmission is random (between 3 and 5 ‘time units’, you choose a random time for each packet and acknowledgement sent).
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@@ -40,7 +40,6 @@ Propagation Time = 3-5tu
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Processing Time (B) = 2tu
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Window Size = 2
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For propagation time, I am going to use the following values:
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For propagation time, I am going to use the following values:
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( 0 = 3, 1 = 3, 2 = 4, 3 = 4, 4 = 5), and for simplicity's sake, I will mirror the propagation time there with the propagation time back for the acknowledgement.
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-
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