「暗号化」は英語で"encrypt"、 "encipher"または "encode"と訳せます。
質問の「近年ではメールなどの情報を盗まれないために暗号化する」は下記のように訳せます。
"In recent years people encrypt their emails to avoid their information being stolen"
"In recent years people encipher their emails so that their information isn't stolen"
"In recent years people encode their transactions online so that their information isn't stolen"
他の例文:
"I encode all my messages for security reasons"「私は送るメッセージは全てコード化します」