User documentation

GCRYPT V0.1.0 user guide.

The procedures below reflect the documented features and behavior of V0.1.0.

Français / English

Application language

By default, GCRYPT follows the Windows, macOS, or Linux session language: French for fr-* locales and English for all others. To override it: ⚙ SETTINGS → Language → Automatic / Français / English. The change is immediate and this non-sensitive preference is stored locally.

V1 mode

Encrypt

Open ENCRYPT.

Select or drop a file, or use Direct text.

Enter and confirm a password of at least 12 characters.

Choose the output folder.

Click ENCRYPT. The output uses GCRYPT V1.

V1 + V2

Decrypt

Open DECRYPT.

Drop a .gcrypt file.

Enter the password.

Choose the output folder.

Start decryption. GCRYPT automatically detects V1 or V2.

Standard ZIP

Compress

Open COMPRESS and choose a file or folder.

Choose Fast, Balanced, or Maximum.

Choose the output folder.

Click CREATE ZIP.

Profile	Deflate
Fast	1
Balanced	6
Maximum	9

An already-compressed format such as JPG or MP4 may shrink very little. After creation, GCRYPT reads the ZIP again before reporting success and displays the size before/after plus the gain or overhead.

GCRYPT V2

Compress + encrypt

The documented pipeline remains:

file   → Zstandard → encryption → .gcrypt V2
folder → internal TAR → Zstandard → encryption → .gcrypt V2

Profile	Zstandard level
Fast	1
Balanced	3
Maximum	19

Local CSPRNG

Password generator

Uppercase, lowercase, digits, and symbols can be configured. The result can be copied or sent directly to ENCRYPT or COMPRESS + ENCRYPT. The interface also displays a theoretical entropy estimate intended for passwords generated randomly by GCRYPT.

Preferences

Settings

Dark / Light: immediately changes the application theme and stores that non-sensitive preference locally.
Memory purge: never, or after 1, 5, 15, 30, or 60 minutes of inactivity.
Clear now: immediately purges sensitive information kept in memory.
Windows: status, installation, and removal of the .gcrypt association.

An active operation is never interrupted by the automatic purge. Non-sensitive preferences are stored in settings.conf.

.gcrypt extension

File association

Windows

Recommended method: SETTINGS → .gcrypt file association → ASSOCIATE .GCRYPT. The association is installed for the current user and does not require administrator rights.

macOS

The bundle declares the .gcrypt document type. After extraction, launch GCRYPT.app at least once so macOS can register the bundle.

Linux

chmod +x ./ASSOCIER_GCRYPT_LINUX.sh
./ASSOCIER_GCRYPT_LINUX.sh

To remove it: ./ASSOCIER_GCRYPT_LINUX.sh --remove

Distribution

Verify a download

Every GCRYPT V0.1.0 package includes a SHA-256 checksum. The exact commands are grouped on the Download page.

View SHA-256 commands