Premission

This challenge is very simple, a ciphertext is given and you must find a way to decode it. The ciphertext is the following:

Gsv kzhhdliw gszg blf mvvw rh gsv mznv gszg
yvolmth gl gsv nzm gszg hzbh gsv mvcg hvmgvmxv:

"Givzg blfi kzhhdliw orpv blfi gllgsyifhs.
Wlm'g ovg zmbylwb vohv fhv rg, zmw tvg z mvd
lmv vevib hrc nlmgsh."

This text is ciphered using a simple substitution method. You can find more about this method here or here.

I usually decipher it by my own, I don't have any program to do that for me but certainly there're some deciphers for free.
This tool, this frequency table , and a frequency counter may help on the process.
Usually I seek for some keywords on the text, like 'the', 'password', 'that', 'of', 'if', 'is'. Using this tips we can infer the following:

GSV - THE
GSZG - THAT
WLM'G - DON'T
KZHHDLIW - PASSWORD

It seems to agree with the frequency table, since E (V) is the most frequent letter, followed by T (G), then we have O (L) and M (N) that both have high frequencies too...
It's pretty easy =)

On the end you'll have the plaintext as follows:

The password that you need is the name that
belongs to the man that says the following sentence:

"Treat your password like your toothbrush.
Don't let anybody else use it, and get a new
one every six months."