OTTAWA - The Harper government's recent bid to give police more information about Internet users would have unlocked numerous revealing personal details — from web-surfing habits to names of friends, says a new study by the federal privacy watchdog.

The online surveillance bill was effectively a digital key to determining someone's leanings, the people they know and where they travel, says the office of Privacy Commissioner Jennifer Stoddart.

"What's more, each of these pieces of information can be used to uncover further information about an individual," concludes the study.

"As information technologies become more and more common in our lives, and the more they become an extension of our very selves, the more sensitive and revealing subscriber identification information becomes."

The Conservative government abandoned the legislation in February following a public outcry.

The bill would have allowed police, intelligence agents and competition bureau officers access to Internet subscriber information — including name, address, telephone number, email address and Internet Protocol (IP) address — without a warrant.

Currently, the release of such data held by Internet service providers is voluntary.

Opponents of the bill said allowing authorities access to Internet subscriber information without a court-approved warrant would be a worrisome erosion of privacy because even that limited data can help paint a candid picture.

The federal government, on the other hand, likened the information in question to a listing in a public phone book.

The privacy commissioner's study, initiated while the bill was still before Parliament, says the government's characterization "grossly misconstrues and underestimates" what can be gleaned from the data with a bit of additional effort.

"In general, the findings lead to the conclusion that, unlike simple phone book information, the elements examined can be used to develop very detailed portraits of individuals providing insight into one's activities, tastes, leanings and lives."

Assistant privacy commissioner Chantal Bernier said Canadians are protective about their Internet activities.

"We should be extremely careful about granting unwarranted access about basic subscriber information," she said Wednesday in an interview.

"The challenge is to ensure privacy on the Internet while at the same time not creating a space for anonymity for criminals."

In its study, the privacy commissioner's office focused on elements covered by the bill which are not found in a phone book — email address, mobile phone number and IP address, the numerical sequence assigned to an online device.

Taking the actual mobile phone number of a staff member in the privacy commissioner's office, the researchers used commonly available Internet tools such as search engines to reveal the individual's full name, their phone service provider, two personal web sites and their domain registrations, an affiliation with a university and contributions to online discussion forums.

Similar to a phone number, an email address can lead to a variety of information about someone, says the study, including friends on social network services and previous employers.

An IP address can help divulge someone's personal interests and even point to their physical location, the privacy commissioner added.

A service provider may assign a temporary IP address to a computer for anywhere from a few days to a few months, notes the study.

The authors looked at one IP address shown by Wikipedia, the online encyclopedia site, to reveal that the person behind the address had edited hundreds of entries about television shows and history topics, taken part in a discussion board about a TV channel and visited a site devoted to sexual preferences.

The study points to the case of David Petraeus, the U.S. Central Intelligence Agency director who resigned over revelation of an extramarital affair. His indiscretions came to light after the Federal Bureau of Investigation used IP addresses to trace harassing emails his mistress had sent to another woman.

In dropping the online surveillance bill, Justice Minister Rob Nicholson said the government would not include mandatory disclosure of basic subscriber information in future revisions of the Criminal Code.

Bernier said while she hopes the study's findings turn out to be moot, the privacy commissioner's office has received no direct assurances about the federal legislative intentions.

"We really have no idea, we have had no communication about that one way or another."

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  • What's In Online-Snooping Bill

    Like similar legislation introduced in the past by both Conservative and Liberal governments, the new bill includes provisions that would: <em>With files from CBC</em> (Shutterstock)

  • Warantless Online Info

    Require telecommunications and internet providers to give subscriber data to police, national security agencies and the Competition Bureau without a warrant, including names, phone numbers and IP addresses. (CP)

  • Back Door Access

    Force internet providers and other makers of technology to provide a "back door" to make communications accessible to police. (Getty)

  • Location, Location, Location

    Allow police to get warrants to obtain information transmitted over the internet and data related to its transmission, including locations of individuals and transactions. (Alamy)

  • Preserve Data

    Allow courts to compel other parties to preserve electronic evidence. (Alamy)

  • New Bill Is Different

    However, unlike the most recent previous version of the bill, the new legislation: (Alamy)

  • Less Data

    Requires telecommunications providers to disclose, without a warrant, just six types of identifiers from subscriber data instead of 11. (Alamy)

  • Oversight

    Provides for an internal audit of warrantless requests that will go to a government minister and oversight review body. Minister of Public Safety Vic Toews is pictured. (CP)

  • Review After 5 Years

    Includes a provision for a review after five years. (Alamy)

  • More Time To Implement

    Allows telecommunications service providers to take 18 months instead of 12 months to buy equipment that would allow police to intercept communications. (Alamy)

  • Expanded Definitions

    Changes the definition of hate propaganda to include communication targeting sex, age and gender. (Alamy)