Here's some humble little extract whereby I reproduce here:
Encrprtion involve algorithms just as programs do. Some people have an affinity for cryptic things that most people cannot understand.
Data compression is closely associated with encrytion
Substitution Ciphers, transpositional, bit manipulation, 8 into 7 data compression, the 16 character language
Substitutional ciphered codes are comparetively less difficult to break
Hope this helps