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Aug 27, 2019 Using symmetric key or using the developers gpg key. Symmetric Key. First we will create the symmetric key(and lets name it as secret-file-to-unlock) using the command, git-crypt export-key secret-file-to-unlock. Then share the symmetric key with the developers securely using gpg or any other means. For this reason, you should better rely on a 256 bit key to use for symmetric AES encryption and then encrypt/decrypt that symmetric AES key with the asymmetric RSA keys This is how encrypted connections usually work, by the way. Generate the unique symmetric key key.bin of 32 bytes (i.e. 256 bit) as follows: $ openssl rand -base64 32 -out key.bin. Git-crypt unlock Or with a symmetric key: git-crypt unlock /path/to/key That's all you need to do - after git-crypt is set up (either with git-crypt init or git-crypt unlock), you can use git normally - encryption and decryption happen transparently. Current Status. The latest version of git-crypt is 0.6.0, released on 2017-11-26. Hatter Jiang, WebEncrypt.Org, My key: https://hatter.in/keyhttps://hatter.in/key.

• Git Generate Key
• Generate Ssh Key Windows Git
• Symmetric Key Cryptography
• Git-crypt Generate Symmetric Key Vs

git-crypt enables transparent encryption and decryption of files in agit repository. Files which you choose to protect are encrypted whencommitted, and decrypted when checked out. git-crypt lets you freelyshare a repository containing a mix of public and private content.git-crypt gracefully degrades, so developers without the secret key canstill clone and commit to a repository with encrypted files. This letsyou store your secret material (such as keys or passwords) in the samerepository as your code, without requiring you to lock down your entirerepository.

git-crypt was written by Andrew Ayer (agwa@andrewayer.name).For more information, see https://www.agwa.name/projects/git-crypt.

Building git-crypt

See the INSTALL.md file.

Using git-crypt

Configure a repository to use git-crypt:

Specify files to encrypt by creating a .gitattributes file:

Like a .gitignore file, it can match wildcards and should be checked intothe repository. See below for more information about .gitattributes.Make sure you don't accidentally encrypt the .gitattributes file itself(or other git files like .gitignore or .gitmodules). Make sure your.gitattributes rules are in place before you add sensitive files, orthose files won't be encrypted!

Share the repository with others (or with yourself) using GPG:

USER_ID can be a key ID, a full fingerprint, an email address, oranything else that uniquely identifies a public key to GPG (see 'HOW TOSPECIFY A USER ID' in the gpg man page). Note: git-crypt add-gpg-userwill add and commit a GPG-encrypted key file in the .git-crypt directoryof the root of your repository.

Alternatively, you can export a symmetric secret key, which you mustsecurely convey to collaborators (GPG is not required, and no filesare added to your repository):

After cloning a repository with encrypted files, unlock with with GPG:

Or with a symmetric key:

That's all you need to do - after git-crypt is set up (either withgit-crypt init or git-crypt unlock), you can use git normally -encryption and decryption happen transparently.

Current Status

The latest version of git-crypt is 0.5.0, released on2015-05-30. git-crypt aims to be bug-free and reliable, meaning itshouldn't crash, malfunction, or expose your confidential data.However, it has not yet reached maturity, meaning it is not asdocumented, featureful, or easy-to-use as it should be. Additionally,there may be backwards-incompatible changes introduced before version1.0.

Security

git-crypt is more secure that other transparent git encryption systems.git-crypt encrypts files using AES-256 in CTR mode with a synthetic IVderived from the SHA-1 HMAC of the file. This mode of operation isprovably semantically secure under deterministic chosen-plaintext attack.That means that although the encryption is deterministic (which isrequired so git can distinguish when a file has and hasn't changed),it leaks no information beyond whether two files are identical or not.Other proposals for transparent git encryption use ECB or CBC with afixed IV. These systems are not semantically secure and leak information.

Limitations

git-crypt relies on git filters, which were not designed with encryptionin mind. As such, git-crypt is not the best tool for encrypting most orall of the files in a repository. Where git-crypt really shines is wheremost of your repository is public, but you have a few files (perhapsprivate keys named *.key, or a file with API credentials) which youneed to encrypt. For encrypting an entire repository, consider using asystem like git-remote-gcryptinstead. (Note: no endorsement is made of git-remote-gcrypt's security.)

git-crypt does not encrypt file names, commit messages, symlink targets,gitlinks, or other metadata.

git-crypt does not hide when a file does or doesn't change, the lengthof a file, or the fact that two files are identical (see 'Security'section above).

Files encrypted with git-crypt are not compressible. Even the smallestchange to an encrypted file requires git to store the entire changed file,instead of just a delta.

Although git-crypt protects individual file contents with a SHA-1HMAC, git-crypt cannot be used securely unless the entire repository isprotected against tampering (an attacker who can mutate your repositorycan alter your .gitattributes file to disable encryption). If necessary,use git features such as signed tags instead of relying solely ongit-crypt for integrity.

Files encrypted with git-crypt cannot be patched with git-apply, unlessthe patch itself is encrypted. To generate an encrypted patch, use gitdiff --no-textconv --binary. Alternatively, you can apply a plaintextpatch outside of git using the patch command.

git-crypt does not work reliably with some third-party git GUIs, suchas Atlassian SourceTreeand GitHub for Mac. Files might be left in an unencrypted state.

Gitattributes File

The .gitattributes file is documented in the gitattributes(5) man page.The file pattern format is the same as the one used by .gitignore,as documented in the gitignore(5) man page, with the exception thatspecifying merely a directory (e.g. /dir/) is not sufficient toencrypt all files beneath it.

Also note that the pattern dir/* does not match files undersub-directories of dir/. To encrypt an entire sub-tree dir/, place thefollowing in dir/.gitattributes:

The second pattern is essential for ensuring that .gitattributes itselfis not encrypted.

Mailing Lists

To stay abreast of, and provide input to, git-crypt development,consider subscribing to one or both of our mailing lists:

Secure context
This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Use the generateKey() method of the SubtleCrypto interface to generate a new key (for symmetric algorithms) or key pair (for public-key algorithms).

Syntax

Parameters

• algorithm is a dictionary object defining the type of key to generate and providing extra algorithm-specific parameters.
  • For RSASSA-PKCS1-v1_5, RSA-PSS, or RSA-OAEP: pass an RsaHashedKeyGenParams object.
  • For ECDSA or ECDH: pass an EcKeyGenParams object.
  • For HMAC: pass an HmacKeyGenParams object.
  • For AES-CTR, AES-CBC, AES-GCM, or AES-KW: pass an AesKeyGenParams object.
• extractable is a Boolean indicating whether it will be possible to export the key using SubtleCrypto.exportKey() or SubtleCrypto.wrapKey().
• keyUsages Â is an Array indicating what can be done with the newly generated key. Possible values for array elements are:
  • encrypt: The key may be used to encrypt messages.
  • decrypt: The key may be used to decrypt messages.
  • sign: The key may be used to sign messages.
  • verify: The key may be used to verify signatures.
  • deriveKey: The key may be used in deriving a new key.
  • deriveBits: The key may be used in deriving bits.
  • wrapKey: The key may be used to wrap a key.
  • unwrapKey: The key may be used to unwrap a key.

Return value

• result is a Promise that fulfills with a CryptoKey (for symmetric algorithms) or a CryptoKeyPair (for public-key algorithms).

Exceptions

The promise is rejected when the following exception is encountered:

SyntaxError

Raised when the result is a CryptoKey of type secret or private but keyUsages is empty.

SyntaxError

Raised when the result is a CryptoKeyPair and its privateKey.usages attribute is empty.

Examples

RSA key pair generation

This code generates an RSA-OAEP encryption key pair. See the complete code on GitHub.

Elliptic curve key pair generation

This code generates an ECDSA signing key pair. See the complete code on GitHub.

HMAC key generation

This code generates an HMAC signing key. See the complete code on GitHub.

AES key generation

This code generates an AES-GCM encryption key. See the complete code on GitHub.

Git Generate Key

Specifications

Browser compatibility

Generate Ssh Key Windows Git

Symmetric Key Cryptography

See also

Git-crypt Generate Symmetric Key Vs

• Cryptographic key length recommendations.
• NIST cryptographic algorithm and key length recommendations.