A plan that could in essence lower the amount of personal data you share in the exchange has been suggested by IBM researchers.
The ABC4Trust plan is building an "electronic wallet", with encrypted versions of all a person's details.
A question by a device similar to a "chip and PIN" reader will engage usually the data that is particularly necessary.
The thought could moreover be practical to online transactions, and aims to give people more manage over personal data.
IBM researchers, vocalization at a press eventuality at the firm's investigate laboratory in Zurich, say this exchange of encrypted data in a little by little conform is far preferable to the box in which, for example, a consumer hands over a pass or driver's permit for identification.
IBM is entangled in building a few of the protocols and technology to achieve the goals of the 13.6m euro (11.4m) European-funded Attribute-Based Credentials for Trust project.
"There's two simple beliefs that you try to request to be able to safeguard online privacy," January Camenisch, an IBM assistant professor who is segment of the ABC4Trust project, told BBC News.
"One of them is that with every square of data that you're releasing you should mention what this data is used for - what's the role and because it's needed.
"The second is that when you let go something, you should usually let go the data that is minimally vital for this purpose."
For instance, renting a automobile might need no more data than confirming that a patron has had a current looseness for a since number of years.
Joining a chatroom for teenagers, by contrast, needs usually a declaration that a prospective user is inside of a particular age group.
In Dr Camenisch's vision, the future "electronic wallet" may be deployed to declare these information through encrypted transactions that give up no serve information.
The project, that began in November and will run for 4 years, aims to conclude initial of all the technology that is indispensable to achieve its goal.
In principle, every singular personal item could be crunched in to one long encrypted number that could even be stored in a mobile phone.
Dr Camenisch mentioned a tradesman or service provider such as a automobile rental group would have a device that could send requests for definite pieces of data to a phone, and he described what the phone would display.
"It would open the 'wallet application', and discuss it you that the rental group wants to know from you that you have a looseness and you took the assessment more than 4 years ago," he explained.
The phone would list what data is being requested and then emanate an encrypted "token" that contains the answers.
"Your phone would do the rest - it would discriminate the new tokens from that and send that data off to the automobile rental agency."
Dr Camenisch mentioned that the element functions the same for online transactions.
He explained that sufficient of the project's work lies forward in the growth of the encryption protocols and the reader devices.
But the plan is ensuring that the standards may be reviewed and softened as the technology is developed.
"In the end, these kinds of technologies will be open standards," Dr Camenisch said. "Some of the work is already existing as open-source ethics so everyone can assess that and see that it does what it promises to do."
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