Decrypt message using one of the following: ** Additive cipher ** Multiplicative

Question

Decrypt message using one of the following:

** Additive cipher

** Multiplicative cipher

** Affine cipher

** Vigenère Square

** Hill System

** Playfair Method

** RSA Method (Public keys n=55, e=7, with private key 37

Show the mathematics for the first ten characters – do not use a brute force method?. After the first ten characters you can use tech help to solve the rest of the message.

And it has to make sense!

QOISK JLKEO KVHQS OHOBP AHAOE APJOC BPAPU CJJHX CHAEH SFOJO CBPOL CFSKH SKBSQ PQSBJ LCPLH XOHXS KECPL ESRPC HASPE HXCHX CNOCB AEOPC PLRJS KBAEX OLCPL NCPAE XOLRB SMAHM CHXOM CHAIE CJSPO QSKJL SIIKV WMOOA UXHMA JJASP WOCBE

Explanation / Answer

Additive cipher: is a technique to encrypt and decrypt the message , In this technique we just specified some length(shift) between two characters and in decryption we just minus the specified shift length.

Encryption :

E(x)=(x+n) mod 26

Decryption: (x-n)mod 26

Question solution:

Cipher Text: QOISK JLKEO(take 10 letters from given cipher text)

for n=4(shift)

Plain Text:MKEOG FHGAK

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