The OP doesn't understand the Mathematical meaning of encryption/decryption and doesn't understand how it's different to encoding/decoding.
https://danielmiessler.com/study/encodi ... fuscation/
Encoding is a reversible mathematical transformation:
encoding(X) = Y
decoding(Y) = X
Encryption is a reversible mathematical transformation where given a secret key K:
encrypt(X,K) = Y
decrypt(Y,K) = X
If knowledge X was encrypted and stored in your brain as Y then you are still left with two questions:
1. Who has the decryption key K?
2. What is the decryption function?
I won't even bore you with the details of symmetric/asymmetric encryption.