Reference - Cryptography

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Conjur uses industry-standard cryptography to protect your data.

There are several ways in which Conjur uses cryptography, each of which are described below. Much of Conjur’s cryptography is implemented in the open-source project slosilo. Slosilo is basically a wrapper around OpenSSL.

Cryptographic audit

Conjur’s cryptography has been professionally audited. We responded to all audit findings with the release of Slosilo 2.0 in November of 2014.

Authentication tokens

Most requests to Conjur require an authentication token. An authentication token is a Conjur-specific JWT with the following claims:

  • sub The client’s login name.
  • iat Numeric timestamp at which the token was issued
  • exp (optional) Numeric timestamp at which the token will expire.
  • cidr (optional) List of IP netmasks which the request bearing this token must match.

Protected JWS header should also include:

  • alg Signature algorithm; only is accepted – see slosilo for reference implementation.
  • kid Fingerprint of the token-signing key.

Conjur access tokens are valid for 8 minutes since iat if an exp claim does not dictate otherwise.

The signature algorithm and access token implementation was included in the cryptographic audit of Conjur v4; since v4 used proprietary JSON token encapsulation which predated JWT, with v5 Conjur migrated to using industry-standard JWT. The signature algorithm and most of the token handling code have been unchanged.

Secret values

Secrets and API keys are encrypted with AES-256-GCM and stored securely in the following manner:

  • The Conjur service has a unique 256-bit master key (don’t lose this!).
  • Each value is encrypted with a unique encryption key.
  • The unique key is encrypted with the master key.
  • The encrypted unique key and the encrypted value are stored in the database.

Encryption and decryption of secret values was included in the cryptographic audit.


Passwords are stored in the Conjur database using bcrypt, with a work factor of 12.

Storage and verification of passwords was included in the cryptographic audit.