DecryptFile
DecryptFile["password",file]
generates a decrypted version of a file, using the specified password.
DecryptFile["password",source,target]
generates a decrypted version of source, putting the result in target.
DecryptFile[keyspec,source,…]
decrypts using the cryptographic key specification keyspec.
Details and Options
- DecryptFile takes a file encrypted by EncryptFile.
- DecryptFile works with both files and cloud objects.
- DecryptFile[key,file] returns the name of the decrypted version of file, or $Failed if the file could not be decrypted with key.
- DecryptFile[key,CloudObject[…]] returns a new anonymous cloud object containing the decrypted version of the contents of the original cloud object, or $Failed if the original cloud object could not be decrypted with key.
- DecryptFile[key,File[…]] is also supported.
- The cryptographic key specification keyspec for DecryptFile[keyspec,…] has the same form as for Decrypt.
- DecryptFile has the following options:
-
Permissions Automatic permissions to set for created cloud objects OverwriteTarget False whether to overwrite an existing file with an automatically named new file - The setting for Permissions affects only cloud objects newly created by DecryptFile[key,CloudObject[…]], not cloud objects explicitly specified as targets.
- With Permissions->Automatic, any permissions set will be given by $Permissions. However, if $Permissions is not "Private", DecryptFile will give a message when it generates a cloud object.
- The setting for OverwriteTarget affects only files to be newly created by DecryptFile[key,file] whose names would collide with existing files.
Examples
open allclose allBasic Examples (4)
Write a string to the file tmp.txt:
Encrypt the file tmp.txt using a password:
Delete the files used in this example:
Encrypt a file containing an image, putting the result in a new file:
Decrypt the encrypted file, again putting the result in a new file:
Delete the files used in this example:
Encrypt the cloud object, getting back another cloud object:
Decrypt the encrypted cloud object, getting back yet another cloud object:
Get the contents of the decrypted cloud object:
Create an archive file from a directory:
Decrypt the encrypted archive:
Extract the archive into the current directory:
Delete the extracted directory and intermediate files used in this example:
Scope (2)
Options (2)
Permissions (1)
OverwriteTarget (1)
Write a string to the file tmp.txt:
This attempts to write over tmp.txt:
With OverwriteTarget->True, DecryptFile overwrites tmp.txt:
Possible Issues (2)
Encrypt the file using the password "my password":
If you use the wrong password, you get a message:
Encrypt the cloud object, getting back another cloud object:
If $Permissions is not "Private", DecryptFile gives a message:
If the Permissions option is explicitly set, no message is issued:
Text
Wolfram Research (2017), DecryptFile, Wolfram Language function, https://reference.wolfram.com/language/ref/DecryptFile.html (updated 2020).
CMS
Wolfram Language. 2017. "DecryptFile." Wolfram Language & System Documentation Center. Wolfram Research. Last Modified 2020. https://reference.wolfram.com/language/ref/DecryptFile.html.
APA
Wolfram Language. (2017). DecryptFile. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/DecryptFile.html