You seem to be confusing encoding (base64 for example), and encryption (AES for example).
Where a side channel attack studying the decryption speed/power use can reveal information, the encoding of said encrypted data can not as far as I ever heard about. (It will still be encrypted after base64 decoding has taken place).
Please correct me if I'm wrong.
EDIT: I see you updated your original message with different wording, please ignore this rant.
Where a side channel attack studying the decryption speed/power use can reveal information, the encoding of said encrypted data can not as far as I ever heard about. (It will still be encrypted after base64 decoding has taken place).
Please correct me if I'm wrong.
EDIT: I see you updated your original message with different wording, please ignore this rant.