International Business Machines Corporation

Dale C Gugliotta

Linwood Hugh Overby, Jr

Bala Rajaraman

Lynn Douglas Long

Scott Allan Campbell

Masashi E Miyake

Arthur James Stagg

Louis Frank Menditto

Andrew Stephen Burke

Management of datastream construction prior to transmission of the datastream across a channel of a communications system by providing for data blocking while reducing movement or copying of the data improves the performance in a communications system. Multiple header segments received from a higher layer in the communications stack are copied into the datastream header area of a datastream such that the header segments are sequentially stored in the datastream header area. A datastream buffer list having entries referencing the datastream header area is generated. Buffer list entries referencing data segments received from higher layers in the communications stack are also stored in the datastream buffer list. The data segments are not physically moved or copied into the datastream during processing by the communications stack. Rather, a 'virtual' datastream is generated by the communications stack for transmission without physically moving or copying the data segment. The datastream is transmitted across the channel by the system input/output interface by first writing the datastream header area referenced by the datastream buffer list directly into the channel, and the data segments directly from their original storage location into the channel of the communications system using the datastream buffer list entries.

Systems and methods for transmitting and receiving data in connection

Management of the processing of relatively large data objects in a communications stack having multiple layers improves the performance in a communications system in preparing relatively large data objects for transmission across a communications network. This reduces or eliminates data movement and copying during segmentation of the relatively large data objects into relatively small data objects, and appendage of headers to the relatively small data object segments during processing in the communications stack. A shared storage manager creates and controls multiple tokens representing multiple images of portions of the relatively large data objects to enable separate scheduling of the multiple images from the same storage unit or buffer to be passed from one layer in a communications stack to the next lower layer in the communications stack. The large data object is segmented into a plurality of relatively small data object segments at one or more of the layers in the communications stack. When dictated by the communications stack, header segments are also created for each relatively small data object segment. Each header segment contains specific information for the relatively small data object segment to which the header corresponds. A separate buffer list is generated by the communications stack for each relatively small data object segment and for each corresponding header segment.

Systems and methods for managing the processing of relatively large data

A method and system for verifying the identity of a computer network node is provided. As part of the session initiation process between two partner nodes planning to exchange sensitive encrypted data, the node receiving data generates and encrypts a session key which is transmitted to the node sending data. At the sending node, the low order four bytes of the encrypted session key are saved for authentication of the receiving node. The encrypted session key is returned to the receiving node as session set-up continues. The receiving node concatenates the low order four bytes of the encrypted session key with four bytes of pseudorandom data to form an initial chaining value which is then encrypted and transmitted to the sending node. The sending node recovers the initial chaining value and compares the low order four bytes of this value with the low order four bytes of the encrypted session key previously saved. If the values are the same, authentication of the receiving node is established.

Method and system for authenticating a computer network node

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Raleigh, NC, United States of America

Dale C Gugliotta