不留记录即时通讯（Off-the-Record Messaging，缩写为OTR）是一种安全协议，为即时通信提供加密保护。OTR使用128bit长度的高级加密标准（AES）对称密钥加密保护，1536bits的迪菲－赫尔曼密钥交换（D-H）与SHA-1函数。在加密与验证机制之外，OTR同时提供前向保密（Forward secrecy）功能。[1]
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