Secrecy proverbs are said during a conversation to prove that the speaker is trustworthy and that they can keep a secret under any condition. Trustworthiness is an important cultural ideal and breaking one's word is considered taboo.

The proverbs below were originally revealed on the Power Klingon audio tape:

hov gajbezbog ram rur peg gajbezbog jaj.
Hov ghajbe'bogh ram rur pegh ghajbe'bogh jaj.
A day without secrets is like a night without stars. 

dez liz sovluzdiz cak dozhaz.
De' lI' Sovlu'DI' chaq Do'Ha'.
Knowledge of useful information may be unfortunate.

 not mev pegmey.
not mev peghmey.
Secrets never cease.

 jijaxpaz jax hovmey.
jIjatlhpa' jatlh Hovmey.
The stars will talk before I will.

lojmit posdak dak pag.
lojmIt poSDaq Daq pagh.
No one eavesdrops at an open door.

The next two proverbs were revealed later

 ziw hik yap tuzluzbez.
'Iw HIq yap tu'lu'be'.
Sufficient blood wine does not exist.

This proverb was correctly guessed by Lawrence M. Schoen (aka 'anghal) at the 21st qep'a' in 2014. Confirmed by Marc Okrand.

vabdot sovbez targwij
vabDot Sovbe' targhwIj
Even my targ doesn't know

This proverb was correctly guessed by Jackson Bradley (aka DeSDu'). Confirmed by Marc Okrand.