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Transcrypt is a Bash script that encrypts a short list of sensitive files inside a Git repository while giving configured users a plaintext working copy. It suits teams that need to protect a few files, such as environment files, credentials or configuration secrets, and that share one password. It does not suit anyone who wants to protect most or all of a repository. The project’s own documentation says the tool is not meant for that job, and the rest of this article explains why the limits matter.
What transcrypt does
The transcrypt project describes itself as “A script to configure transparent encryption of sensitive files stored in a Git repository.” It configures Git clean and smudge filters. Files whose paths match patterns listed in the tracked .gitattributes file are encrypted when they are staged and committed. A configured local checkout shows them decrypted, so day-to-day editing looks the same as working with ordinary files.
The project also states that the approach degrades gracefully: “even people without your encryption password can safely commit changes to the repository’s non-encrypted files.” Only the designated files require the password. Everything else in the repository behaves as usual.
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The steps below follow the project’s documented flow. They describe the documentation, not a test run of each command on your system.
#1 Best Overall
- Certified to FIPS 197 - High-level information security standard approved by the U.S. Government
- Brute-Force Password Attack Protection - Data is automatically erased after 6 failed access attempts. The data and encryption key are securely destroyed and the crypto drive is reset
- Rugged Double-Layer Waterproof* Design - Protects the crypto drive against knocks, drops, break-in and submerging in water. The electronics are shielded by a hardended inner case. The rubberised silicone outer casing provides a final layer of protection
- Auto-lock - The crypto drive will automatically encrypt all data and lock when removed from a PC/Mac or when the screen saver or "computer lock" function is activated on the host PC/Mac
- Secure Entry - Data cannot be accessed without the correct high-strength alphanumeric 8-16 character password. A password hint option is available. The password hint cannot match the password
- Make the script available. Place
transcryptin the repository or somewhere on yourPATH. The project’s installation documentation also lists native package options. - Check dependencies. The documented requirements are Bash, Git, OpenSSL and
column. With OpenSSL 3 or later, the README also listsxxd, aprintfthat supports the%bdirective, or Perl as alternatives for one required operation. GnuPG is optional and is used only for exporting and importing secure configuration. - Configure the repository. Run transcrypt inside the Git repository to configure it for encryption.
- Designate files. Add a pattern with
transcrypt --add <pattern>. For example,transcrypt --add "config/*.env"would match environment files in aconfigdirectory. - Commit the rules and the files together. Stage and commit
.gitattributesalong with the selected files, for examplegit add .gitattributes config/prod.envfollowed bygit commit. - List matched files. Use
transcrypt --listorgit ls-cryptto see which files the patterns cover. - Inspect the stored form.
transcrypt --show-raw <file>displays the Git object representation, which is useful for confirming that what reaches the remote is ciphertext.
How the encryption works
The default cipher is aes-256-cbc, according to the current source file and the README. Each file’s salt is derived rather than random. The project describes the salt as the last 16 bytes of an HMAC-SHA256 keyed with the filename and the transcrypt password, with the file content included in the input.
The project’s stated consequences are these. Every encrypted file gets its own salt. The salt changes when content changes. Unchanged content encrypts to the same output each time. That last property is what lets Git store repeated commits without producing noise for files that did not change, but it also means ciphertext reveals when a file has stayed the same. These are the project’s own claims about its construction. They have not been independently audited, and this article does not present them as validated.
Rank #2
- Certified to FIPS 197 - High-level information security standard approved by the U.S. Government
- Brute-Force Password Attack Protection - Data is automatically erased after 6 failed access attempts. The data and encryption key are securely destroyed and the crypto drive is reset
- Auto-lock - The crypto drive will automatically encrypt all data and lock when removed from a PC/Mac or when the screen saver or "computer lock" function is activated on the host PC/Mac
- Secure Entry - Data cannot be accessed without the correct high-strength alphanumeric 8-16 character password. A password hint option is available. The password hint cannot match the password
- SuperSpeed USB 3.0 - Transfer all your confidential files and folders faster than ever before. Works on both PC & Mac
What the design does not protect
Default CBC mode provides no authentication
This is the most important caveat. The README states that the default CBC approach lacks authentication. Authenticated cipher modes are desirable, the project says, but they raise compatibility concerns with older OpenSSL installations and the openssl enc interface. CBC malleability is described as a known limitation under consideration.
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1Clear out junk files and repair common Windows errors2Fix the driver behind crashes, sound loss and screen glitches3Repair Windows errors before they cause bigger problemsIn practice, a collaborator who lacks the password can potentially alter the plaintext of an encrypted file in limited ways, particularly if they know what the original plaintext contained. Do not treat the default mode as tamper-proof. Anyone who can commit to the repository should be trusted with the integrity of the encrypted files, not just their confidentiality.
Rank #3
- Certified to FIPS 197 - U.S. Government Approved High Level Information Security Standard.
- Protection against brute force password attacks - Data is automatically erased after 6 unsuccessful access attempts. The data of the USB flash drive type c encryption with dual connectors is destroyed and the cryptographic drive is reset.
- Durable dual-layer waterproof design* — Protects the crypto reader from bumps, drops, run-in and immersion in water. The electronics are protected by a hardened internal case. Rubberized silicone outer case provides a final layer of protection.
- Auto-Lock —The cryptographic key automatically encrypts all data and locks when removed from a PC/Mac or when screen protection or "computer lock" is enabled.
- Secure Entry —Data on these flash drives cannot be accessed without the correct alphanumeric password of 8 to 16 characters. A password indication option is available for this flash drive. The hint cannot match the password.
Credentials are stored in plaintext locally
The configuration, including credentials, sits in plaintext in the local repository’s .git/config. This configuration is not carried to remote clones, but anyone with access to the local machine can read it. After you update encrypted files, the project suggests running transcrypt --flush-credentials to clear cached credentials. Keep a backup of the credentials somewhere else before flushing, or you will lose access to your own working copy.
Only file contents are encrypted
Transcrypt encrypts the contents of selected files. The project’s documentation does not say which other repository metadata, such as filenames, paths or commit messages, stays visible. Until you verify that for your setup, assume that anyone who can read the repository history can see paths and commit messages. Encrypting file contents does not hide the existence or names of the files.
Rank #4
- FIPS 197 with XTS-AES 256-bit Encryption: Provides business-grade security with hardware-based encryption to protect your sensitive data
- Brute Force and BadUSB Attack Protection: Safeguards against unauthorized access attempts and malicious USB attacks with digitally-signed firmware
- Multi-Password Option with Complex/Passphrase modes: Offers flexible password configuration options to meet various security requirements and user preferences
- New Passphrase Mode: Enhanced security feature allowing users to create longer, more memorable password phrases for easier access without compromising protection
- Dual Read-Only (Write-Protect) Settings: Enables write protection functionality to prevent accidental data modification or deletion when needed
Filters add overhead
Git filters start OpenSSL processes, and the project warns that they reduce the efficiency of Git’s file-change caching. A few files cause little noticeable cost. Many large files, or frequent commits touching them, will show the difference.
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Rekeying and maintaining history
Use transcrypt --rekey to change the cipher or password and re-encrypt the protected files. Plan for three consequences.
Best Value
- FIPS 140-3 Level 3 (Pending) Certified Military-Grade Security
- OS/Device Independent
- XTS-AES Hardware Encryption
- Enforced Alphanumeric PIN
- Multi-PIN (Admin and User) Option
- Plaintext history becomes unavailable through transcrypt. The project warns that rekeying removes the ability to view historical diffs in plaintext. Historical encrypted patches remain viewable with
git log --patch --no-textconv. - Other clones need manual updates. Each clone must flush its old credentials, fetch and merge the re-encrypted changes, and then be configured with the new credentials.
- Coordinate the change. Anyone who pulls before updating can end up with a working copy that does not match the new password, so announce the rekey before running it.
Version status
The current main source reports the version string 2.3.3-pre. That marks a pre-release build. Check the project’s tagged releases before pinning a version for production use, and treat the main branch as a moving target.
Transcrypt or git-crypt
The closest alternative is git-crypt, another tool for encrypting selected files in Git. Its README describes encrypting selected files at commit and decrypting them at checkout. The table compares the two as each project documents them. Where a cell says “not stated,” the cited README does not address that point.
| Question | transcrypt (project README and source) | git-crypt (project README) |
|---|---|---|
| Intended scope | Selected sensitive files; documentation says it is unsuitable for most or all of a repository | Selected files; README says it is poorly suited to encrypting most or all repository files |
| Encryption method | Default aes-256-cbc; per-file salt derived from HMAC-SHA256 |
AES-256 in CTR mode with a synthetic IV derived from a file HMAC |
| Authentication of ciphertext | Default CBC mode lacks authentication; the project names this as a known limitation | not stated in the cited README |
| Determinism and leakage | Unchanged content encrypts deterministically; the cited README does not discuss identical-file leakage | Deterministic encryption leaks whether two files are identical |
| Filenames and metadata | not stated in the cited README | README states that filenames and several other forms of repository metadata are not encrypted |
| Local credential storage | Plaintext in local .git/config; not carried to remote clones |
not stated in the cited README |
| Rekey or revocation | transcrypt --rekey re-encrypts; other clones must flush and re-merge; plaintext history diffs become unavailable through the tool |
README lists limits on revoking access to data that was previously available |
| Version fact | 2.3.3-pre in current main source |
0.8.0, released 2025-09-23, per its README; newer releases may exist |
Each project’s security claims are its own. Compare them on construction, key handling, rekey needs, Git compatibility and the scope you actually need.
Choosing between them
- Transcrypt fits a small set of files, a small trusted group sharing one password, and a team willing to rekey and reconfigure clones by hand when credentials change.
- Choose a different approach if you need to protect most of the repository, if authenticated integrity matters for the encrypted files, or if hiding filenames is a requirement.
- Check the metadata and revocation rows in the table against your threat model before committing secrets to either tool.
Transcrypt is a narrow tool for a narrow job. Used for a few files, with the limits above understood, it does that job. Used as a substitute for whole-repository encryption, it does not.
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