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# How does the Transfer Tool work?
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To understand how the TT works, it helps to look at a diagram. In the example on the right, Labo1 wants to send DNA sequences of bacteria/viruses in a protected manner. To do so, the data exchange will rely on asymetric/public key encryption. The SPSP server has a public key and a private key, which are two mathematically related encryption keys. The public key can be shared with any laboratory, but only the SPSP server has the private key.
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To understand how the TT works, it helps to look at a diagram. In the example on below, Labo1 wants to send DNA sequences of bacteria/viruses in a protected manner. To do so, the data exchange will rely on asymetric/public key encryption. The SPSP server has a public key and a private key, which are two mathematically related encryption keys. The public key can be shared with any laboratory, but only the SPSP server has the private key.
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First, Lab1 uses the TT to compress the sequences files (*.fastq) and metadata file (*.xlsx) into a tar.gz archive.
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Then, the TT generates a unique hash of the previously generated archive using SHA-256 algorithm, meaning that if the content changes even slightly, the hash will be completely different.
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