How many hexadecimal digits are required to write down a 4096-bit string? Give encryption or decryption of these hexadecimal messages using the one-time pad algorithm, giving the result in hexadecimal also. You may wish to convert to binary first, but give your final answer in hexadecimal. m = 0xbabedada, K = 0x2a71ed94, c = ? c = 0xda7c175a, K = 0x2a71ed94, m = ? 4.  c = 0x71744c1a, K = 0x8f99bc17, m = ?

Help with this please

22. You need to compute 12345678965537 (mod 581859289607). A friend offers to help: 1 cent for each multiplication mod 581859289607. Your friend is hoping to get more than $650. Describe how you can have the friend do the computation for less than 25 cents. (Note: 65537216+1 is the most commonly used RSA encryption exponent.)

N blocks of plaintext (P1 to PN) are being encrypted in CFB mode into ciphertext (C1 to CN). Assume that two bits of C3 are erroneous (their binary values have flipped). What bits of C3, C4, and C20 are erroneous?

Encrypt the animal name marmot using the letter to number correspondence abc de f 8hijk 1 mnopar stuvw x y 2 e 1 2 3 4 5 6 7 8 9 18 11 12 13 14 15 16 17 18 19 28 21 22 23 24 25 and the encryption function e :n + (n +1) mod 26 The answer will be a nonsense word (no numbers).

If someones ID in a country has 3 values from (0,1) followed by 2 letters in english alphabet. Everyone assigned an ID has a long string consist of bit string followed by letters. How many strings can be possible?

Convert the decimal number (1249)10 to its equivalent binary, hexadecimal, and octal (base 8). What is the minimum number of bits that you need for each base? (You can show decimal numbers using d: 1249d = (1249)10), and h for hexadecimal numbers, and b for binary numbers). Extend the sign of this number, and convert it to a 32-bit binary.

Only. Q1

How many 14-bit strings (that is, bit strings of length 14) are there which: a. Start with the sub-string 011? 2048 b. Have weight 4 (i.e., contain exactly 4 1's) and start with the sub-string 011? 330 c. Either start with 011 or end with 01 (or both)? 6144 d. Have weight 4 and either start with 011 or end with 01 (or both)? 825

tmppsxguyoigpnoymuwhug is the given message.starting 4 letter of the decrypted message is happ. decrypt the full message