How to decrypt file?

Download Strong File Encryption Decryption Utility and install it. Following is the step-by-step guide to decrypt your file or folder.

1. Start the program.

2. In the Main Window click on a file or on a folder to select it. In the left panel you can select folders. In the right panel you can select a folder or a file.

3. Click Decrypt button.

4. Define options in the Decryption Options dialog box.

5. Click Next to display Execute window.

6. Click Execute to start encryption. Verify encryption log in the Execute window.

7. Click Close to return to the main program window.

Main Window

1. Start Strong File Encryption Decryption utility. The Main Window is displayed.

2. In the Main Window you can select a file or a folder for encryption or decryption.

3. Click Encrypt or Decrypt to set encryption or decryption options.

Decryption Options

1. Verify the name of the selected folder in the Decrypt Files From This Folder edit box. To change the selected folder click Select and select a new folder. You can also click Close and select a new folder in the main window.

2. Decrypt Files Into This Folder displays a destination folder. Decrypted files will be saved into this folder. To select or create a destination folder click Select. Select or make a new folder in the Browse For Folder window.

3. Decrypt Files With This Name edit box displays the name of the selected file if the file was selected for decryption, or displays a wildcard (*.*) if a folder was selected for decryption. The wildcard *.* means all files from the selected folder will be decrypted. You can define your wildcard here. For example if you enter *.txt only text files will be decrypted.

4. Enter a new extension in the Change File Extension To edit box. Empty box means that all decrypted files will be created with the same name and extension as your original files. If you enter new value then decrypted files will have file extension changed. For example you can enter TXT as a new extension. If a file selected for decryption has BACKUP.ENC name, then this file will be decrypted and saved as BACKUP.TXT. For Decryption you can use a "-" in Change File Extension To edit box, for example enter "-.enc". This means that the decrypted files will have ".enc" removed from the end of the names, so "data.dbf.enc" will become "data.dbf". Use "-" option when your files were encrypted with "+" option.

5. Click Encryption Type selection box and select the encryption type you want to use.

6. Click Key Size selection box and select the key size.

7. Private Key edit box displays the value of your secret key. You can generate, load, or paste from Clipboard your private key into this box. If it is a new key make sure you save it for future use.

Click Generate Private Key From Password Phrase to generate a secret key from the password phrase.

Click Load Private Key From A File to load a secret key from the file.

Click Save Private Key To A File to save a secret key to a file.

8. Select Delete Source File check box to delete source file(s).

9. Select Unzip Before Decryption to unzip a selected file. Click Select and select a file.

10. Select Zip After Decryption to zip decrypted files. Click Select and select a destination folder and a name of the zipped file. If you enter a new file name it will be created automatically.

11. Click Next to display Execute window.

Strong File Encryption Decryption Utility

PrimaSoft Strong File Encryption utility is a Windows software that allows you easily and quickly to encrypt and decrypt selected files or folders on your computer using the latest industry standard strong encryption algorithms:
* AES (US Advanced Encryption Standard, secret-key encryption also known as Rijndael)
* Twofish (secret-key encryption)
* RSA (public-key encryption)

PrimaSoft Strong File Encryption / Decryption supports the following encryption algorithms:

AES/Rijndael

AES (US Advanced Encryption Standard) secret key encryption algorithm known as Rijndael. Certified by National Institute of Standards and Technologies (NIST). AES is the new official US government standard for encryption of data.
* Developed by Joan Daemen and Vincent Rijmen.
* Method symmetrical block cipher encryption algorithm.
* It uses 128 or 256-bit keys.

Twofish

Twofish encryption algorithm, a runner-up candidate for AES.
* Developed by Bruce Schneier, is a successor to the Blowfish algorithm.
* Method symmetrical block cipher encryption algorithm.
* It uses 128 or 256-bit keys.

RSA

RSA encryption is a public-key encryption algorithm.
* Method based on the RSAES-OAEP scheme RSA Encryption Scheme - Optimal Asymmetric Encryption Padding. It is the encryption scheme recommended by RSA Security.
* It uses 1024, 2048-bit keys.

Public-key encryption is an encryption technique that uses a pair of keys. Files encrypted with one key can only be decrypted by the other key. The Public key is distributed to parties that are going to encrypt files. Files encrypted with the Public key can only be decrypted by the holder of the Private key.