In its filing to the Securities and Exchange Commission (SEC) the group said it believed "the intruder had access to the decryption tool for the encryption software utilized by TJX".
You can include attachments, high quality photos and HD video, and your iMessages appear on all your devices so you can pick up a conversation right where you left off. iMessage includes group messaging, delivery and read receipts, typing indicators and secure end-to-end encryption.