org.cryptimeleon.craco.enc

Interface EncryptionScheme

All Superinterfaces:

org.cryptimeleon.math.serialization.Representable, org.cryptimeleon.math.serialization.annotations.RepresentationRestorer, org.cryptimeleon.math.serialization.StandaloneRepresentable

All Known Subinterfaces:

AsymmetricEncryptionScheme, StreamingEncryptionScheme

All Known Implementing Classes:

ElgamalEncryption, StreamingCBCAES, StreamingGCMAES, StreamingGCMAESPacketMode, StreamingHybridEncryptionScheme

public interface EncryptionScheme
extends org.cryptimeleon.math.serialization.StandaloneRepresentable, org.cryptimeleon.math.serialization.annotations.RepresentationRestorer

An EncryptionScheme has the ability to encrypt plaintexts and decrypt the resulting ciphertext (using EncryptionKeys and DecryptionKeys).

The functional contract is that decrypt(encrypt(m, pk), sk).equals(m) for pk, sk that "fit" together (depending on the concrete type of encryption scheme).

Sub-Interfaces define how you obtain encryption and decryption keys. Cf. AsymmetricEncryptionScheme for a very simple example.

EncryptionSchemes are stand-alone representable. So once set up, you can restore the same scheme with the same public parameters using the Representation mechanism (i.e. call the class's constructor with a Representation argument).

Method Summary

Modifier and Type	Method and Description
PlainText	decrypt(CipherText cipherText, DecryptionKey privateKey) Decrypts the given cipher text using the given decryption key.
default PlainText	decrypt(org.cryptimeleon.math.serialization.Representation cipherText, org.cryptimeleon.math.serialization.Representation privateKey)
CipherText	encrypt(PlainText plainText, EncryptionKey publicKey) Encrypts the given plain text using the given encryption key.
default CipherText	encrypt(org.cryptimeleon.math.serialization.Representation plainText, org.cryptimeleon.math.serialization.Representation publicKey)
CipherText	restoreCipherText(org.cryptimeleon.math.serialization.Representation repr) Restores the ciphertext corresponding to the given representation.
DecryptionKey	restoreDecryptionKey(org.cryptimeleon.math.serialization.Representation repr) Restores the decryption key corresponding to the given representation.
EncryptionKey	restoreEncryptionKey(org.cryptimeleon.math.serialization.Representation repr) Restores the encryption key corresponding to the given representation.
default java.lang.Object	restoreFromRepresentation(java.lang.reflect.Type type, org.cryptimeleon.math.serialization.Representation repr)
PlainText	restorePlainText(org.cryptimeleon.math.serialization.Representation repr) Restores the plaintext corresponding to the given representation.

Methods inherited from interface org.cryptimeleon.math.serialization.Representable

getRepresentation

Method Detail

encrypt

CipherText encrypt(PlainText plainText,
                   EncryptionKey publicKey)

Encrypts the given plain text using the given encryption key.

Parameters:

plainText - the plaintext to encrypt

publicKey - the key to use for encryption

Returns:

the resulting ciphertext

decrypt

PlainText decrypt(CipherText cipherText,
                  DecryptionKey privateKey)

Decrypts the given cipher text using the given decryption key.

Parameters:

cipherText - the ciphertext to decrypt

privateKey - the key to use for decryption

Returns:

the resulting plaintext

restorePlainText

PlainText restorePlainText(org.cryptimeleon.math.serialization.Representation repr)

Restores the plaintext corresponding to the given representation.

Parameters:

repr - the representation to restore the plaintext from

Returns:

the plaintext corresponding to the given representation

restoreCipherText

CipherText restoreCipherText(org.cryptimeleon.math.serialization.Representation repr)

Restores the ciphertext corresponding to the given representation.

Parameters:

repr - the representation to restore the ciphertext from

Returns:

the ciphertext corresponding to the given representation

restoreEncryptionKey

EncryptionKey restoreEncryptionKey(org.cryptimeleon.math.serialization.Representation repr)

Restores the encryption key corresponding to the given representation.

Parameters:

repr - the representation to restore the encryption key from

Returns:

the encryption corresponding to the given representation

restoreDecryptionKey

DecryptionKey restoreDecryptionKey(org.cryptimeleon.math.serialization.Representation repr)

Restores the decryption key corresponding to the given representation.

Parameters:

repr - the representation to restore the decryption key from

Returns:

the decryption key corresponding to the given representation

encrypt

default CipherText encrypt(org.cryptimeleon.math.serialization.Representation plainText,
                           org.cryptimeleon.math.serialization.Representation publicKey)

decrypt

default PlainText decrypt(org.cryptimeleon.math.serialization.Representation cipherText,
                          org.cryptimeleon.math.serialization.Representation privateKey)

restoreFromRepresentation

default java.lang.Object restoreFromRepresentation(java.lang.reflect.Type type,
                                                   org.cryptimeleon.math.serialization.Representation repr)

Specified by:

restoreFromRepresentation in interface org.cryptimeleon.math.serialization.annotations.RepresentationRestorer