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Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Clear out junk files and repair common Windows errorsFree Scan →transcrypt is a Bash script that configures Git clean and smudge filters so that a short list of sensitive files is stored encrypted in a repository, while a configured local checkout shows those files in plain text. It is built for protecting selected files, not whole repositories. The project’s own documentation says it is unsuitable for encrypting most or all of a repository, so it fits only when a handful of secrets need protection and the rest of the project can stay readable to everyone with access.
How transcrypt works
The transcrypt official README describes the tool as a script that configures transparent encryption of sensitive files stored in a Git repository. The files to protect are named by patterns recorded in the tracked .gitattributes file. When a matching file is staged and committed, Git stores the encrypted representation. A local checkout that has been configured with the password presents the decrypted contents, so editors and build tools work on ordinary text.
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The project also states that the design degrades gracefully: people without the encryption password can still commit changes to the repository’s non-encrypted files. That makes the model practical for mixed teams, where most contributors never touch the secret files.
Setup and daily workflow
The documented flow has five stages. The commands below are taken from the project documentation and have not been independently tested here.
#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
transcryptinside the repository or somewhere on yourPATH. The README’s installation section also lists native package options. - Configure the repository. Run
transcryptinside the Git repository. This sets up the filter configuration and asks for the cipher and password. - Designate files. Run
transcrypt --add <pattern>for each file or pattern to protect, for example a credentials file or a key directory. - Commit the configuration with the data. Stage and commit
.gitattributestogether with the selected files, so the patterns travel with the repository. - Check what is matched. Use
transcrypt --listorgit ls-cryptto list the files the patterns currently cover. To inspect the object Git actually stores, usetranscrypt --show-raw <file>.
Runtime requirements
- Bash
- Git
- OpenSSL
column- For OpenSSL 3 and later, one of
xxd, aprintfthat supports the%bdirective, or Perl, as the README lists for a required conversion step - GnuPG is optional and is only needed for secure export and import of configuration
Security design and its limits
Read this section before deciding whether transcrypt matches your threat model. The design choices below are the project’s own, described in its README; they have not been validated by an independent cryptographic audit.
Cipher and per-file salt
The default cipher is aes-256-cbc, a value the current source also sets as its default. The README describes deriving a per-file salt deterministically: the salt comes from the last 16 bytes of an HMAC-SHA256 keyed with the filename and the transcrypt password, with the file content included in the derivation. According to the project, this gives each encrypted file its own salt, changes the salt when content changes, and keeps unchanged content encrypting to the same output. That determinism is what lets Git see no change when a protected file is untouched, but it also means identical content produces identical ciphertext.
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
No authentication: a warning to read first
The README explicitly acknowledges that the default CBC approach provides no authentication. It says authenticated cipher modes would be desirable but raise compatibility concerns with older OpenSSL installations and the openssl enc interface, and it treats CBC malleability as a known limitation under consideration. Do not treat the default encryption as authenticated encryption. The project also warns that a malicious committer without the password could potentially manipulate plaintext in limited ways if that committer knows the original plaintext.
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Credentials stored locally
According to the README, credentials and configuration are stored in plaintext in the local repository’s .git/config. That configuration does not transfer to remote clones, but it is not protected from anyone with access to the local machine. After updating encrypted files, the project suggests running transcrypt --flush-credentials to clear cached credentials, while keeping a backup of the password somewhere safe.
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.
Performance overhead
Git filters add cost. The project notes that each filtered file launches OpenSSL and that Git’s file-change caching becomes less efficient. The project’s own guidance is to use transcrypt for a small set of sensitive files and to choose a different tool when the goal is to encrypt the whole repository.
What a hosting service can see
Encrypting file contents does not hide the repository’s structure. Protected files are still tracked under their paths, and .gitattributes, commit messages, authors, and history remain ordinary Git data. A hosting service stores whatever Git stores, so for a matched file it holds the encrypted representation rather than plain text. Whether that ciphertext can be read without the password depends on the cipher limits above, and the project’s documentation does not make claims about any specific hosting provider.
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
Rekeying and maintaining several clones
The project documents transcrypt --rekey for changing the cipher or password and re-encrypting the protected files. Rekeying has consequences that are easy to miss:
- Historical diffs can no longer be viewed in plaintext through the normal workflow. The README says historical encrypted patches remain viewable with
git log --patch --no-textconv. - Every other clone must flush its old credentials with
transcrypt --flush-credentials. - Those clones then fetch and merge the newly re-encrypted commits.
- Each clone must be configured again with the new credentials.
Plan rekeying as a coordinated team operation, not a one-person change.
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
Version status
The current transcrypt source file on the main branch reports the version string 2.3.3-pre. That is a pre-release marker, so do not describe it as a stable release. Check the project’s tagged releases before relying on a specific version in production.
Comparison with git-crypt
The closest alternative is git-crypt, which also encrypts selected files at commit and decrypts them at checkout. Its git-crypt official README lists version 0.8.0, released 2025-09-23, and describes its method as AES-256 in CTR mode with a synthetic IV derived from a file HMAC. The figures and limits below are git-crypt’s own claims.
| Question | transcrypt | git-crypt |
|---|---|---|
| Intended scope | Selected sensitive files; project says unsuitable for most or all of a repository | Selected files; README says poorly suited to encrypting most or all repository files |
| Default cipher and mode | aes-256-cbc, with no authentication, per the README | AES-256 in CTR mode with a synthetic IV derived from a file HMAC |
| Deterministic output | Unchanged content encrypts deterministically by design | README states deterministic encryption leaks whether two files are identical |
| Filenames and metadata | Not addressed in the project README; protected paths remain Git-tracked paths | README states filenames and several forms of metadata are not encrypted |
| Revoking historical access | Rekeying re-encrypts files but historical plaintext diffs are lost in the normal view | README lists limits on revoking access to data previously available |
| Local credential storage | Plaintext in local .git/config per README |
Not covered in this comparison |
| Latest version information | Source string 2.3.3-pre on main (pre-release) | 0.8.0, released 2025-09-23 |
Compare the two on security construction, key handling, setup and maintenance effort, rekey or revocation needs, and Git compatibility. Do not assume that a limitation documented for one tool applies to the other.
Choosing transcrypt
transcrypt suits a repository where a few files, such as API tokens, configuration secrets, or a private key file, must stay encrypted, and where the rest of the content is meant to be readable by everyone with repository access. It is less suitable when the aim is hiding the whole repository, when the threat includes a malicious committer who knows the original plaintext, or when the team cannot tolerate local plaintext credentials in .git/config. In those cases, evaluate alternatives before adopting it.
Quoted project language
The transcrypt README describes the tool as “A script to configure transparent encryption of sensitive files stored in a Git repository.” It also says: “The process will degrade gracefully, so even people without your encryption password can safely commit changes to the repository’s non-encrypted files.” Both statements are the project’s own wording.
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