| Token | A token issued by TokenService. |
| TokenService | Provides a mechanism to allocate and rebuild secure, randomised tokens. |
| DefaultToken | The default implementation of Token. |
| KeyBasedPersistenceTokenService | Basic implementation of TokenService that is compatible with clusters and across machine restarts,
without requiring database persistence. |
| SecureRandomFactoryBean | Creates a SecureRandom instance. |
| Sha512DigestUtils | Provides SHA512 digest methods. |