Sup?
There are some tricks to break a substitution cipher, most of them are based
on the fact that the spaces between the words in the plaintext are the same
to the spaces in the ciphertext.

This is our ciphertext:
gsv kzhhdliw gszg blf mvvw rh gsv mznv gszg
yvolmth gl gsv nzm gszg hzbh gsv mvcg hvmgvmxv:
"Givzg blfi Kzhhdliw orpv blfi gllgsyifhs.
Wlmg ovg zmbylwb vohv fhv rg, zmw tvg z mvd
lmv vevib hrc nlmgsh."

In this case «Premission» we need to find the password, so, we can asume that
the word "password" will be in our text, lets break this string:
STR[1]P
STR[2]A
STR[3]S
STR[4]S
STR[5]W
STR[6]O
STR[7]R
STR[8]D

What we can say about this string? «as FRAME»
~len«STR»8.
~STR[3][STR[4].

So, now we need to look at our ciphertext and find some 8s chars FRAME that
 FRAME[3] equal to FRAME[4]. 
after searching, we got that the string "kzhhdliw" is the only string that returned
TRUE «according to our ruls», we can guess that mean "password".

Ok, if we guess right, we got some keys:
STR[1]P{k}
STR[2]A{z}
STR[3]S{h}
STR[4]S{h}
STR[5]W{d}
STR[6]O{l}
STR[7]R{i}
STR[8]D{w}

Witch mean:
gsv PASSWORD gsAg bOf mvvD rS gsv mAnv gsAg
yvoOmtS gO gsv nAm gsAg SAbS gsv mvcg Svmgvmxv:
"GRvAg bOfR PASSWORD orpv bOfR gOOgsyRfSs.
WOmg ovg AmbyODb voSv fSv rg, AmD tvg A mvW
Omv vevRb Src nOmgsS."


Now, we can guess that the string "gsv" mean "the" «"the password..."»

After replacing:

STR[1]T{g}
STR[2]H{s}
STR[3]E{v}

We got:

THE PASSWORD THAT bOf mEED rS THE mAnE THAT
yEoOmtS TO THE nAm THAT SAbS THE mEcT SEmTEmxE:
"TREAT bOfR PASSWORD orpE bOfR TOOTHyRfSH.
WOmT oET AmbyODb EoSE fSE rT, AmD tET A mEW
OmE EeERb Src nOmTHS."

Nice, we can see that we are right!
Now, according to the frame "WOmt" we can asume that: c[m]p[N] «WONT».
According to the frame "rT" and "rS" we can asume that: c[r]p[T] «IT and IS».
According to the frame "EoSE" we can asume that: c[o]p[L] «ELSE».

After replacing we got:
THE PASSWORD THAT bOf NEED IS THE NAnE THAT
yELONtS TO THE nAN THAT SAbS THE NEcT SENTENxE:
"GREAT bOfR PASSWORD LIpE bOfR TOOTHyRfSH.
WONT LET ANbyODb ELSE fSE IT, AND tET A NEW
ONE EeERb SIc nONTHS."

Now, according to the frames "NAnE", "nAN" and "nONTHS", we can asume
that: c[n]p[M] «NAME, MAN and MONTHS».

and now we got:

THE PASSWORD THAT bOf NEED IS THE NAME THAT
yELONtS TO THE MAN THAT SAbS THE NEcT SENTENxE:
"GREAT bOfR PASSWORD LIpE bOfR TOOTHyRfSH.
WONT LET ANbyODb ELSE fSE IT, AND tET A NEW
ONE EeERb SIc MONTHS."

This is for this time. now try to continue by yourself. - goodluck!
By cp77fk4r. [TryThis0ne Admin].