Matt Blaze analyzes why the widespread use of cryptography has had almsost no impact on our practical ability to do wiretaps and gather information under legitimate court orders. Not too technical and absolutely worth a read.

Matt Blaze: Wiretapping and Cryptography Today:

The EFF has an excellent article on eight reasons why government regulation of cryptography is a bad idea.

The short answer is: the bad guys can easily get it and use it anyway, and it will make security for the rest of us much worse (not including the big brother surveillance  and constitutional issues).

This NYTimes article discusses a bill which the Obama administration is proposing to submit to congress. The general background of the bill is that evolving technology has made it more difficult for law enforcement to conduct effective wiretaps and other intercepts because much of the targeted communication now takes place on the Internet and is often encrypted.

The actual text of the proposed bill does not appear to be available, but the article lists the following likely requirements.

1. Communications services that encrypt messages must have a way to unscramble them.
2. Foreign-based providers that do business inside the United States must install a domestic office capable of performing intercepts.
3. Developers of software that enables peer-to-peer communication must redesign their service to allow interception.

The first of these is similar to the CALEA law which requires telecommunications carriers to design their services to enable automated real time intercepts. While this generally sounds reasonable when “we” say it, the idea is more ominous when coming from some other governments.

The second of these feels uncomfortably familiar. See my past blog posts (and here)on the attempts of privacy hostile countries to require similar concessions from RIM.

The third proposal is completely outrageous. In effect it says that I may not speak in a way which is unintelligible to the wire tappers. As a colleague quipped “I am hiring Navajo code talkers.” This would require a back door be inserted in to cryptography tools. Experience shows that any crypto system with such a back door will be breached and then left vulnerable to the enormous number of criminal hackers on the Internet today.

In 1993 the US Government proposed a system called the “Clipper Chip” which would provide all encryption for personal computers, but to which the US Government would have back door access. This was a terrible idea then, it was widely ridiculed, and suffered a well justified death by 1996. This third proposal would be much worse. It is asking huge numbers of non-crypto experts to build back doors in to their systems. Frankly, the cryptography in most software is already badly broken in many cases. Something as subtle and complex as a secure and effective law enforcement back door would be far beyond their abilities and render currently poor security completely untrustworthy.

All this is not to mention the potential abuse by oppressive regimes, who will pounce on the capability to further crush dissent within their countries. Finally, it will be largely ineffective against serious threats. Very strong and easy to use cryptography is already available world wide, for free (GPG, ZPhone, TrueCrypt, etc.). This is a classic case of damaging the innocent while leaving the guilty and dangerous unaffected.

It seems to me that there is a pendulum swing to these things. Technology cuts both ways. Some times it favors the interceptor and some times it favors the communicator. In most ways the Internet has been a fantastic boon to law enforcement. Cloud computing, email hosts, social networking, open WiFi, and huge hard drive that encourage people to save everything all provide law enforcement with enormous amounts of information they could never have collected in the past.

It may not be shocking to anyone that there is no federal push to make that more difficult to access while pushing to enhance their ability to intercept encrypted communications.

All this is argument about a bill we have not seen yet. Let us hope that the furor that has swirled around it will cause it to be retraced or modified significantly before it is actually delivered to congress.

In a recent post on Privacy Digest, and an article in the NYTimes, there is a discussion of some major and well known vulnerabilities in the global public key infrastructure (PKI) and some examples of exploitations of that vulnerability.

The issue is with the proliferation of certificate authorities on the Internet, and the low level of oversight on their policies.

Using the web as an example, here is how it works. Embedded in every browser is a list of “certificate authorities”. These are companies that are deemed trustworthy to issue and sign website certificates. Website certificates are what allows websites to be authenticated by your browser and enables SSL based secure connections (e.g. to your bank).

These certificate authorities may also be able to delegate their certificate signing authorities to other secondary certificate authority organizations. The list of primary certificate authorities in your browser is long (I count 43 in my copy of Firefox), and who knows how many secondary certificate authorities may be out there. These certificate authorities exist all over the world, and any of them can issue a certificate that your browser will accept as valid.

A malevolent certificate authority could issue certificates to allow them to impersonate any secure website.

The articles talk specifically about a secondary certificate authority called Etisalat, located in the UAE. They created a certificate which allowed them to sign code which would be accepted as valid and authorized by BlackBerry cell phones. They then created and distributed software to about 100,000 users which enabled government surveillance of the devices. RIM, the maker of BlackBerry, was able to detect and patch this introduced back door.

Etisalat could create certificates to allow the UAE to intercept and read all secure web traffic traveling over networks within that country.

It is likely that there are many other certificate authorities that are similarly willing to compromise the security of the PKI for various ends. To date, no action has been taken against Etisalat. The EFF is calling for Verizon to revoke Etisalat’s ability to issue certificates (Verizon is the primary authority that delegated to Etisalat as the secondary).

There has been a lot of media coverage of the threats of Saudi Arabia and the UAE to shut down BlackBerry connectivity in their countries unless RIM (the maker of BlackBerry) introduces a back door so they can monitor communications.

I have been following this story closely, but wanted to wait until I had all the facts before blogging about it. At this point I don’t think I am going to get the whole story. The statements I am seeing are absolutely contradictory and the whole thing is getting really fishy.

UAE/SA say that they need to be able to access BlackBerry communications, but they can’t.

RIM says that their technology makes interception impossible because the communications are encrypted end to end between the BES server (located at the users place of business) and the handset. RIM claims not to have access to the decryption keys.

Third parties claim that RIM has arrangements with other countries (including the US and Russia) which allows such access.

RIM responds that this is false and that they don’t have this ability.

It looks like RIM and UAE/SA will come to an agreement while both continue to claim that they have not compromised their positions.

The moral of this story is that you should not trust security you can not fully analyze yourself. Anonymizer Universal uses strongly encrypted L2TP VPN technology to secure your information so even if your telecommunications provider is cooperating with surveillance they still can’t read the contents of your messages.

Unfortunately Anonymizer Universal does not support BlackBerry yet, but iPhone, Windows, and Mac users are protected.