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# Authentication & Security
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Comprehensive authentication mechanisms including SCRAM, X.509 certificates, Kerberos, and client-side field-level encryption for secure MongoDB deployments.
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## Capabilities
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### MongoCredential
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```java { .api }
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public final class MongoCredential {
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    public static MongoCredential createCredential(String userName, String database, char[] password);
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    public static MongoCredential createScramSha1Credential(String userName, String source, char[] password);
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    public static MongoCredential createScramSha256Credential(String userName, String source, char[] password);
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    public static MongoCredential createMongoX509Credential(String userName);
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    public static MongoCredential createGSSAPICredential(String userName);
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    public String getUserName();
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    public String getSource();
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    public AuthenticationMechanism getMechanism();
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}
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public interface ClientEncryption extends Closeable {
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    BsonBinary encrypt(BsonValue value, EncryptOptions options);
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    BsonValue decrypt(BsonBinary encryptedValue);
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    BsonBinary createDataKey(String kmsProvider);
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}
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```
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*[Full authentication and security documentation would follow...]*