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License: GPLv3 CodeQL Specification

Kryptor

Kryptor is a simple, modern, and secure file encryption and signing tool for Windows, Linux, and macOS.

It aims to be a better version of age and Minisign to provide a leaner, user friendly alternative to GPG.

kryptor

Features

  • The latest and greatest cryptographic primitives, with no config options.
  • Encrypt multiple files/directories with a passphrase, symmetric key, or asymmetric keys.
  • Encrypt to multiple recipients for sender authenticated, one-way file sharing.
  • Encrypted files are indistinguishable from random. File names can also be encrypted.
  • Create and verify digital signatures, with support for an authenticated comment and prehashing.
  • Small public keys. Private keys are encrypted for protection at rest.
  • UNIX style passphrase entry and random passphrase generation.
  • Pre-shared keys can be used for post-quantum secure key exchange.

For more information, please go to kryptor.co.uk.

Usage

If you're just getting started, check out the tutorial instead.

Usage: kryptor [options] <file>

Arguments:
  file             specify a file/directory path

Options:
  -e|--encrypt     encrypt files/directories
  -d|--decrypt     decrypt files/directories
  -p|--passphrase  specify a passphrase (empty for interactive entry)
  -k|--key         specify or randomly generate a symmetric key or keyfile
  -x|--private     specify your private key (unused or empty for default key)
  -y|--public      specify a public key
  -n|--names       encrypt file/directory names
  -o|--overwrite   overwrite files
  -g|--generate    generate a new key pair
  -r|--recover     recover your public key from your private key
  -s|--sign        create a signature
  -c|--comment     add a comment to a signature
  -l|--prehash     sign large files by prehashing
  -v|--verify      verify a signature
  -t|--signature   specify a signature file (unused for default name)
  -u|--update      check for updates
  -a|--about       view the program version and license
  -h|--help        show help information

Examples:
  --encrypt [file]
  --encrypt -p [file]
  --encrypt [-y recipient's public key] [file]
  --decrypt [-y sender's public key] [file]
  --sign [-c comment] [file]
  --verify [-y public key] [file]

Specifying files

When referencing file names/paths that contain spaces, you must surround them with "speech marks":

$ kryptor -e -p "GitHub Logo.png"
$ kryptor -e -p "C:\Users\samuel-lucas6\Downloads\GitHub Logo.png"

Files in the same directory as the kryptor executable can be specified using their file name:

$ kryptor -e -p file.txt

However, files that aren't in the same directory must be specified using a file path:

$ kryptor -e -p C:\Users\samuel-lucas6\Documents\file.txt

Multiple files and/or directories can be specified at once:

$ kryptor -e file1.txt file2.jpg file3.mp4 Photos Videos

Specifying your private key

You can perform encryption, decryption, and signing with your default private key as follows:

$ kryptor -e file.txt
$ kryptor -d file.txt.bin
$ kryptor -s file.txt

This is the recommended approach, but it means your private keys must be kept in the default folder, which varies depending on your operating system:

  • Windows: %USERPROFILE%/.kryptor
  • Linux: /home/.kryptor
  • macOS: /Users/USERNAME/.kryptor

To specify a private key for -r|--recover or a private key not stored in the default folder, you must use the -x|--private option followed by :[file] like so:

$ kryptor -r -x:"C:\Users\samuel-lucas6\Documents\encryption.private"