Use a Caesar cipher to decrypt the following message: RCB XENA WRWN CQXDBJWM

Decipher the following ciphertext, which was enciphered using the Caesar cipher: TEBKEKQEBZLROPBLCERJXKBSBKQP. Answer:-

Decrypt the following ciphertext using frequency analysis, and explain the entire process. Even if you don’t achieve the complete decryption, you can still get full credit as long as you properly demonstrate the methodology. “FX IWBBJX PB NB PB PWX GBBD. VSP FWO, JBGX JRO, PWX GBBD? FWO IWBBJX PWUJ RJ BSA NBRK? RDL PWXO GRO FXKK RJM FWO IKUGV PWX WUNWXJP GBSDPRUD? FWO, 35 OXRAJ RNB, EKO PWX RPKRDPUI? FWO LBXJ AUIX CKRO PXQRJ? FX IWBBJX PB NB PB PWX GBBD UD PWUJ LXIRLX RDL LB PWX BPWXA PWUDNJ, DBP VXIRSJX PWXO RAX XRJO, VSP VXIRSJX PWXO RAX WRAL, VXIRSJX PWRP NBRK FUKK JXATX PB BANRDUZX RDL GXRJSAX PWX VXJP BE BSA XDXANUXJ RDL JMUKKJ, VXIRSJX PWRP IWRKKXDNX UJ BDX PWRP FX RAX FUKKUDN PB RIIXCP, BDX FX RAX SDFUKKUDN PB CBJPCBDX, RDL BDX FWUIW FX UDPXDL PB FUD, RDL PWX BPWXAJ, PBB.”

Use S-DES to encrypt the plaintext block m = 00011010 using the key K = 1011000101. Show your work, labeling the result after each step and circling the final ciphertext c

Affine Cipher: Find Key and Decrypt to original plaintext   HMHUDUHHCQUHHFZCQHCCHFFHHPUHHIQUHRHGTHGHDPCQPCWRPKHFQZLQNN

B

What is the biggest advantage of CBC mode of operation   a. It does not need Initialization Vector (IV) b. A cipher text block depends on all blocks before it c. It does not propagate errors in the cipher text d. It can encrypt in parallel different parts of the messages