Crack, as a code, is the process of deciphering a coded message or password. It involves breaking down the code into its component parts and then using various methods to figure out the meaning of the code. SOLVE (5 letters) is the act of finding an answer to a problem or puzzle. UNLOCK (6 letters) is the act of opening something that has been locked or sealed. Decrypt (7 letters) is the process of taking encrypted data and converting it back into its original form.