To decrypt a message or a computer file is to take something that was turned into secret code and change it back into ordinary words, pictures, or numbers that a person — or a normal program — can read. Someone encrypted it first: they hid it on purpose. Decrypting is the reverse of that.

To decrypt a message or a computer file把一則訊息或一個電腦檔案decrypt（解密），is to take something that was turned into secret code就是把已經變成密碼的東西，and change it back into ordinary words, pictures, or numbers改回一般人——或一般的程式——能看懂的文字、圖片或數字。Someone encrypted it first一開始有人把它加密了：they hid it on purpose他們是故意把它藏起來的。Decrypting is the reverse of that解密就是反過來做這件事。

You usually need a key or a password; without the right one, the file stays a mess of letters and numbers. Computer people, phone apps, and spy stories use this word.

You usually need a key or a password通常你需要一把金鑰或一組密碼；without the right one, the file stays a mess of letters and numbers沒有對的那一把，檔案就會一直是一堆亂七八糟的字母和數字。Computer people, phone apps, and spy stories use this word電腦圈的人、手機App和間諜故事都會用這個字。

Everyday speakers often say “unlock” or “decode.” Decode is a little wider (any kind of code). Decrypt is the precise word for undoing encryption.

Everyday speakers often say "unlock" or "decode."一般人常會說「unlock（解鎖）」或「decode（解碼）」。Decode is a little wider (any kind of code)Decode的範圍比較廣（任何一種代碼都算）。Decrypt is the precise word for undoing encryptionDecrypt則是專門指「解開加密」的精確用字。