Create an encryption session, and returns the associated EncryptionSession instance, with which you can then encrypt / decrypt multiple messages. Warning : if you want to be able to retrieve the session later, you must put your own UserId in the recipients argument.
The created EncryptionSession.
|recipients||The Seald IDs of users who should be able to retrieve this session.|
|useCache||Whether or not to use the cache (if enabled globally).|