Here are some ways "deciphered" can be used:
* "The archaeologists deciphered the ancient hieroglyphs." (They were able to understand the writing)
* "She deciphered the cryptic message." (She understood the hidden meaning)
* "He deciphered the complex code." (He was able to break the code and understand its message)
Essentially, "deciphered" implies that something was previously unclear or hidden and has now been made understandable.