Decrypt the message $$\large \text{UPRKTG MCTXGB FJ THJB}$$ which was produced using the linear cipher $$\large C\equiv 3P+7\pmod{26}$$

Question

anonymous · Answer

NUMBER THEORY IS EASY

anonymous · Answer

but it's not.

ganeshie8 · Answer

Wow! thats super fast !

ganeshie8 · Answer

How did you manage to decrypt so fast ? xD

anonymous · Answer

so many tools

anonymous · Answer

plus affine cipher is not complicated at all

anonymous · Answer

do my question if you have time XD

ikram002p · Answer

Haha nice

andrewhaze · Answer

i dont get this xD @ganeshie8

ganeshie8 · Answer

It is a code message transmitted from Hill to Gauss.
Our task is to decipher the msg :)

(jk about the first part)

ganeshie8 · Answer

http://en.wikipedia.org/wiki/Hill_cipher

andrewhaze · Answer

well ok then

ganeshie8 · Answer

this isn't as hard as im trying to make it look like... its quite easy actually

ganeshie8 · Answer

the problem statement is simple :  suppose you and me want to send messages secretly by writing on "letters" through postal service. Invent a scheme for secure transfer of messages between you and me.

andrewhaze · Answer

ok thanks for explanation :)

ganeshie8 · Answer

$$\large \text{brx   duh zhofrph! }$$

ganeshie8 · Answer

thats reply to your reply in Caesar cipher :)
lets see if you can decipher it :P