Simplify the following text for a Grade 10 native English-speaking person.
Original: In cryptography , the so-called product ciphers are a certain kind of ciphers , where the ( de - ) ciphering of data is done in `` rounds '' .
Simplified: In cryptography , the so-called product ciphers are a certain kind of ciphers , where the decryption of data is done in `` rounds '' .