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.