When backup operators have to handle giga bytes of information daily, they usually find the task hard enough to leave security aside. This paper consequently intends to focus on proving documents’ authenticity regarding both content and date. In the context of WORM technology, it proposes a media independent tamper evident system using original cryptographic hash function techniques and secure ...

Due to its moderate overhead and small quantization error, the time-stamping counter is currently the most precise time-measuring mechanism on Intel 80X86-based Platform. On the Pentium processors, we can simply use a conventional null benchmark to determine the time-stamping counter’s overhead accurately. Similarly, on the Pentium Pro processors, Intel also recommends the same method for measu...

This paper describes the results of a research activity conducted cooperatively by an academic and an industrial party. It presents a practical solution for and an experience in the implementation of time stamping services and their exposition to the Internet. We present the main state-of-the-art algorithms for time stamping applications, thoroughly discuss pros and cons of each technique, and ...

Nowadays, the Internet is indispensable when it comes to information dissemination. People rely on the Internet to inform themselves on current news events, as well as to verify facts. We, as a community, are quickly approaching an 'electronic information age' where the majority of information will be distributed electronically and tools to preserve this information will become essential. While...

We describe a method for repetitive and rapid formation of planar microarrays and gradients of proteins using patterned agarose stamps. It demonstrates: (i) micropatterning of agarose gels with feature sizes as small as 2 microm; (ii) inking of posts (diameter 50-1000 microm) on patterned agarose stamps with one or multiple (here, eight) proteins and repetitive stamping of patterns (>100 times ...

The innovative hot stamping press of quenchable steel mainly includes two stages: hot forming of blank at elevated temperature and quenching of hot stamped part in closed water-cooled tools. Crucial stage in hot stamping process is quenching of hot formed part in water-cooled tool to achieve final high ultimate tensile strength. In quenching stage, cooling rate of hot stamped part has a signifi...

The present work concerns the forming of the sheet metal conical products which, combined with a vulcanized rubber blend form footings for electric power generators. Conical sheet metal elements are most often formed by the following four methods: – multi-operational stamping with stiff tools, – hydro-mechanical stamping, – spinning, – flow turning. In case of stiff tool stamping, traces on the...