Decrypt the following ciphertext: ODZKG FHOXP FOEYL H...

Decrypt the following ciphertext: ODZKG FHOXP FOEYL HZEZK UXTGY OAGTA OATAX UOAUO DDUPY DTNPU XXKGG YADRV YAUGO HSOXT FDZXY ERYRY XTFOA PYOHU PYWKT YUUOQ QTANZ LUPYH OTAON OTAXU UPYVT AGZVX UPYVT AGBYN TAXUZ NKXUO AGUPY HOTAB YFZEY XEZHY XUYOG ROAGH OQTGT PYOHO DZKGX FHYYF PD...

a) Suppose in phase I of the handshake protocol, the client ...

a) Suppose in phase I of the handshake protocol, the client and the server agree to use Diffie-Hellman to exchange the pre-master secret. In phase 2, the server sends (g=2, p=523, server’s side public key=121) to the client. The client selects your CIN mod 147 (or 34 if the result is 0) as the...

Problem 1 A word was enciphered as ISBOU using the multipli...

Problem 1 A word was enciphered as ISBOU using the multiplication-shift where the multiplier was 5 and the shift was 22. Decode the word using the shift-multiplication method (indicate clearly how you get the shift and the multiplier). Problem 2 Using the multiplication-shift method, the word M...

Suppose you, as an attacker, observe the following 32-byte (...

Suppose you, as an attacker, observe the following 32-byte (3-block) ciphertext C1 (in hex) 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 03 46 64 DC 06 97 BB FE 69 33 07 15 07 9B A6 C2 3D 2B 84 DE 4F 90 8D 7D 34 AA CE 96 8B 64 F3 DF 75 and the following 32-byte (3-block) ciphertext C2 (also ...

Find the plaintext from the cipher. The encryption applies...

Find the plaintext from the cipher. The encryption applies one-time pads which is the first word on page 433 in a bible (note, 433 is bible page number, not the pdf file page number), from http://www.gpbc.ca/kjvbible.pdf You need to switch the cipher back to plaintext based on the one-time pa...

Meet ROXy, a coder obsessed with being exclusively the world...

Meet ROXy, a coder obsessed with being exclusively the worlds best hacker. She specializes in short cryptic hard to decipher secret codes. The below hex values for example, she did something with them to generate a secret code, can you figure out what? Your answer should start with 0x. 0xc4115 0x...

A student recently invented a simple protocol for sending a ...

A student recently invented a simple protocol for sending a message securely from A to B by preserving the confidentiality of the message. In his protocol, A and B do not have a common, shared secret/key. Instead, for each message, both A and B generate random numbers, namely RA and RB, respectively...

1) Unfortunately, all LFSRs repeat after a certain number of...

1) Unfortunately, all LFSRs repeat after a certain number of clock ticks. What are the possible ways to ensure secure encryption for our messages using LFSR (Linear Feedback Shift Register)? 2) What is the reason that zero seeds are not suitable for use in any LFSR? 3) What are the maximum per...

1) The simplest form of a Substitution Cipher is a Monoalpha...

1) The simplest form of a Substitution Cipher is a Monoalphabetic Substitution Cipher. Create one or two lines of ciphertext that is encrypted using a shift monoalphabetic substitution cipher or another one at your own choice. 2) The ciphertext below (which is related to this course) is an e...

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