Thieves Cant

Thieves' Cant allows you to use your Deception skill in a new way. 
1) You may attempt to pass a secret message of no more than 15 words as a free action, once per round. Roll a deception check to determine the decipher DC. 2) Other characters take a –5 penalty to Insight checks to attempt to decipher your secret message. 3) Others proficient in Thieves Cant do not have to roll Insight to decipher your message.
The use of this language is normally just spoken, but it can be written as well.
See also: PC Languages