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Easy. Music is just a file. It does not matter what is in the file. There is room for 294,912 bytes in the low-order bits. MP3s require roughly 1 MB per minute, so about 18 sec of music could fit. 45. Alice could hash each message and sign it with her private key. Then she could append the signed hash and her public key to the message. People could compare verify the signature and compare the public key to the one Alice used last time. If Trudy tried to impersonate Alice and appended Alice’s public key, she would not be able to get the hash right.

People could compare verify the signature and compare the public key to the one Alice used last time. If Trudy tried to impersonate Alice and appended Alice’s public key, she would not be able to get the hash right. If she used her own public key, people would see it was not the same as last time.

72 or 533 instructions. 40. The speed of light in fiber and copper is about 200 km/msec. For a 20-km line, the delay is 100 µsec one way and 200 µsec round trip. A 1-KB packet has 8192 bits. If the time to send 8192 bits and get the acknowledgement is 200 µsec, the transmission and propagation delays are equal. If B is the bit time, then we have 8192B = 2 × 10−4 sec. The data rate, 1/B, is then about 40 Mbps. 41. 937 MB. A 16-bit window size means a sender can send at most 64 KB before having to wait for an acknowledgement.

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