| Package | Description | 
|---|---|
| java.security | Provides the classes and interfaces for the security framework. | 
| javax.crypto | Provides the classes and interfaces for cryptographic operations. | 
| javax.crypto.interfaces | Provides interfaces for Diffie-Hellman keys as defined in
RSA Laboratories' PKCS #3. | 
| javax.crypto.spec | Provides classes and interfaces for key specifications and algorithm
parameter specifications. | 
| javax.security.auth.kerberos | This package contains utility classes related to the Kerberos network
 authentication protocol. | 
| Class and Description | 
|---|
| SecretKey A secret (symmetric) key. | 
| Class and Description | 
|---|
| BadPaddingException This exception is thrown when a particular padding mechanism is
 expected for the input data but the data is not padded properly. | 
| Cipher This class provides the functionality of a cryptographic cipher for
 encryption and decryption. | 
| CipherSpi This class defines the Service Provider Interface (SPI)
 for the  Cipherclass. | 
| ExemptionMechanism This class provides the functionality of an exemption mechanism, examples
 of which are key recovery, key weakening, and
 key escrow. | 
| ExemptionMechanismException This is the generic ExemptionMechanism exception. | 
| ExemptionMechanismSpi This class defines the Service Provider Interface (SPI)
 for the  ExemptionMechanismclass. | 
| IllegalBlockSizeException This exception is thrown when the length of data provided to a block
 cipher is incorrect, i.e., does not match the block size of the cipher. | 
| KeyAgreement This class provides the functionality of a key agreement (or key
 exchange) protocol. | 
| KeyAgreementSpi This class defines the Service Provider Interface (SPI)
 for the  KeyAgreementclass. | 
| KeyGenerator This class provides the functionality of a secret (symmetric) key generator. | 
| KeyGeneratorSpi This class defines the Service Provider Interface (SPI)
 for the  KeyGeneratorclass. | 
| Mac This class provides the functionality of a "Message Authentication Code"
 (MAC) algorithm. | 
| MacSpi This class defines the Service Provider Interface (SPI)
 for the  Macclass. | 
| NoSuchPaddingException This exception is thrown when a particular padding mechanism is
 requested but is not available in the environment. | 
| SealedObject This class enables a programmer to create an object and protect its
 confidentiality with a cryptographic algorithm. | 
| SecretKey A secret (symmetric) key. | 
| SecretKeyFactory This class represents a factory for secret keys. | 
| SecretKeyFactorySpi This class defines the Service Provider Interface (SPI)
 for the  SecretKeyFactoryclass. | 
| ShortBufferException This exception is thrown when an output buffer provided by the user
 is too short to hold the operation result. | 
| Class and Description | 
|---|
| SecretKey A secret (symmetric) key. | 
| Class and Description | 
|---|
| SecretKey A secret (symmetric) key. | 
| Class and Description | 
|---|
| SecretKey A secret (symmetric) key. | 
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