def set_algorithms(self, signature=None, encryption=None,<EOL>serialization=None, compression=None):
self.signature_algorithms =self._update_dict(signature, self.DEFAULT_SIGNATURE)<EOL>self.encryption_algorithms =self._update_dict(encryption, self.DEFAULT_ENCRYPTION)<EOL>self.serialization_algorithms =self._update_dict(serialization, self.DEFAULT_SERIALIZATION)<EOL>self.compression_algorithms =self._update_dict(compression, self.DEFAULT_COMPRESSION)<EOL>
Set algorithms used for sealing. Defaults can not be overridden.