International Business Machines Corporation

Ping Min Lin

Cheng-Ta Lee

Ming-Hsun Wu

Wei-Shiau Suen

A Man in the Middle (MitM) computer receives a first session identifier from a client for a first communication session between the client and a server, and monitors Transport Layer Security (TLS) communication sessions between the client and the server, where the first session identifier is one of an unknown session identifier and an invalid session identifier. In response to receiving the first session identifier from the client, the MitM computer performs one of: requesting a second session identifier from the server for a second communication session if the first session identifier is an unknown session identifier; and transmitting, to the client, an instruction to flush a session cache in the client, where flushing the session cache in the client forces the client and the server to establish a full TLS handshake in order to obtain a session key if the first session identifier is an invalid session identifier.

Seamless abort and reinstatement of TLS sessions

In response to receiving an unknown first session identifier from a client for a first communication session between the client and a server, a Man in the Middle (MitM) computer requests a second session identifier from the server for a second communication session between the server and the MitM computer. The MitM computer generates a third session identifier for a third communication session between the MitM computer and the client. The MitM computer generates a fourth communication session between the server and the client using a combination of the second communication session and the third communication session. In response to receiving an invalid session identifier from the client for a fifth communication session between the client and the server, the MitM computer transmits an instruction, to the client, to flush a session cache in the client to force a full TLS handshake between the client and the server.

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Taipei, Taiwan

Ping Min Lin