Ssh Communications Security Oyj

Kimmo Parviainen-Jalanko

Marko Teiste

Petri Helenius

A first private key used by a device is replaced by a second private key, the first private key having an associated public key. The second private key is secured based on the associated public key and communicated to replace the first private key at the device. The device receives the second private key. The first private key is secured by a secret, and the device uses the secret to decrypt the first private key. The second private key is then encrypted using the decrypt first private key.

Replacing keys in a computer system

A method and apparatus for control of a computer system are disclosed. The computer system includes a terminal for operator based monitoring of the computer system. A monitoring device is provided to determine information about the state of the operator based monitoring. The information is communicated to a controller of the data security system. The controller then controls the data security system based at least in part on the information.

Controlling a computer system

Processing of packets in a stream of packets where the packets are assigned with sequence numbers is disclosed. Packets are distributed into at least two analysis windows based on predetermined N lowest bits of the sequence numbers, wherein an analysis window includes M lowest bits of the sequence numbers, M being an integer greater than N. N+1 to M lowest bits of the sequence numbers are analyzed in at least one of the analysis windows while ignoring the N lowest bits to determine the ordering of the packets. A packet is determined as suspicious in response to the analysis indicating the packet being in an incorrect position.

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Helsinki, Finland

Kimmo Parviainen-Jalanko