Last month, Dell acquired Ocarina Networks, a company that uses compression and de-duplication technologies to optimize storage.

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Then processing, then de-duplication, then searches for relevance and to ascertain whether any privileges could be claimed.

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The UID has been mandated to carry out de-duplication of the biometrics and issue the UID numbers.

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De-duplication is the process of eliminating copies of data by keeping just one to which all the others point.

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Digital security researcher Christopher Soghoian filed the complaint, and was quoted as saying that this de-duplication process resulted in poorer security.

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The best of the biometric databases in the world have a single de-duplication check, to ensure that every person is identified and tagged only once.

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The BBC's business correspondent Joe Lynam said that to reduce overlap between the two banks there was likely to be "de-duplication" of jobs, especially in the insurance arm.

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