Decode the given bitstream and interpret the message that was sent.
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- You have an originating plain text message (in hexadecimal): 41 72 61 62 Use your Student ID number to obtain a 10-bit key as follows: Key (in decimal) = 666. You have to manually cipher the first block of the following plain text message (first 8 bits). The encrypting process will be done using Simplified DES (S-DES). you must explain all steps in detailsp T Note: The notation from this problem is from Understanding Cryptography by Paar and Pelzl. Suppose you have an LFSR with 6 state bits. The first 12 bits of output produced by this LFSR are 100011011000 = s0 $1 $2 S3 S4 S5 S6 87 Sg S9 S10 S11 - The first bit produced is the leftmost bit and the bit most recently produced is the rightmost bit. a) What is the initial state of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent S5 = 0, s4 = 1, 83 = 0, s2 = 1, s1 = 0, so = 1). %3D b) What are the tap bits of the LFSR? Please enter your answer as unspaced binary digits (e.g. 010101 to represent P5 = 0, p4 = 1, pP3 = 0, p2 = 1, p1 = 0, po = 1).When the result of a signed arithmetic operation is either too big or too tiny to fit into the destination, which flag is set?
- How many 88-bit binary strings are there subject to each of the following restrictions? 1. The string starts with 001001. 2. The string starts with 001001 or 1010. 3. The string has exactly 4 zero’s. 4. The string has exactly 4 zeros’s and the first bit is 1.You have an originating plain text message (in hexadecimal): 41 72 61 62 Use your Student ID number to obtain a 10-bit key as follows: Key (in decimal) = (ID mod 1024) +1.You have to manually cipher the first block of the following plain text message (first 8 bits). The encrypting process will be done using Simplified DES (S-DES). you must explain all steps in details [mandatory: write down all the calculations].Triple DES Encryption is the cascade of O DES-Deccryption then DES-Encryption then DES-Decryption and uses 3* 56 = 168 bits as secret key DES-Encryption then DES-Encryption then DES-Encryption and uses 3* 56 = 168 bits as secret key O DES-Encryption then DES-Decryption then DES-Encryption and uses 3* 56 = 168 bits as secret key O DES-Encryption then DES-Decryption then DES-Encryption and uses 3* 64 = 192 bits as secret key
- A temperature sensor that supports CoAP has an operating range of 0–1000 °F reports a reading every 5 s. The sensor has a precision of 1/100 °F. The sensor reports along with every temperature reading a time stamp using the ISO 8601 format (CCYY-MM-DDThh:mm:ss). (a) If the current temperature measured by the sensor is 342.5 °F, construct the payload of a CoAP message with the reading encoded in XML and then in JSON. (b) Assuming that the sensor consumes 3 nano-Joules per byte (character) transmitted over a wireless network, calculate the total energy required to transmit each message. Which of the two encoding schemes (XML or JSON) is more energy efficient? By what percentage? Compare the bandwidth utilization for the XML vs. JSON messages in bits per second assuming UTF-8 text encoding is being used.Alice wishes to tell Bob about the animal she saw at the zoo Alice and Bob share the key stream 1101 1001 0000 1010 1110 1101 Alice creates a 3-character ASCII message, encodes it, and sends it to Bob. This is the ciphertext: 1001 1111 0100 0101 1011 0101 Bob deciphers the message. What animal did Alice see at the zoo?If you are transmitting a large file, you must utilise cypher block chaining or cypher feedback mode. How much more efficient is one?
- Q: A bit stream 1011000 is transmitted using the standard CRC method. The divisor is 1011. What is the actual bit string transmitted? Also find out whether, there is an error or not?QUESTION1 "Rabenstein code was used to send a message with 4 information bits, you receive 100110001 if you can expect at most one bit of corruption, what were the original information bits?" QUESTION 2 Givon the codeword set 111111 000111 110001 101100 011010 Add another codeword to this set that has distance at least 3 to all other codewords.Please solve it correctly and please provide explanation of your answers. Please answer parts g, h and i. A PC and a Web Server are communicating over a TCP connection. The PC had started the three way handshake with the initial sequence number of 3069 . The Web Server's initial sequence number is 4830 . The window size of the PC is 815 bytes and the window size of the Web Server is 463 bytes. Using the third TCP handshake ack segment the PC sends the http request of the size 396 bytes to the Web Server. Then the Web Server answers with 3 segments containing the requested data. The first segment size is 42 bytes and the second segment size is 276 bytes and the third segment size is 146 bytes respectively. The PC receives all three segments within the timer. But unfortunately the second segment was corrupted. So the PC immediately sends an acknowledgement segment. Assume that the PC uses Selective Repeat/Reject ARQ. g) The second segment from webserver was corrupted. So the PC…