org.jitsi:org.otr4j (maven):  otr4j is an implementation of the OTR (Off The Record) protocol in java. Off-the-Record Messaging, is a cryptographic protocol that uses a combination of the Advanced Encryption Standard (AES), the Diffie-Hellman key exchange, and the SHA hash functions. In addition to authentication and encryption, OTR provides perfect forward secrecy and malleable encryption. The OTR protocol was designed by Ian Goldberg and the OTR Development Team. 
Keywords: chat|encyption|encyption-standard|java|library|otr|otrv4|protocol-library|secure