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Yes it’s back. If you’ve been a regular reader, you might remember we had already published the final report of this particular Kushaq Monte Carlo. Thing is though, a lot of us really love this bright red SUV. So when we asked Skoda if we could keep it a bit longer, they very kindly obliged. These days it’s rare to find a mass-segment offering that’s high on driving pleasure. Most are set up to deliver a comfortable but anaesthetised drive. Not this one. And that’s why we all love driving it.

Shapur loves the 1.5-litre TSI engine that’s strong and makes the Kushaq quick off the line as well as in roll-ons. Hormazd took it to his favourite haunt – Mahabaleshwar – and came back proclaiming this to be the best mass segment DSG by a long shot. And I am really smitten with its ride and handling balance. These traits have really come in handy during the monsoons – overtaking black-and-yellow cabs, struggling through rain-ravaged streets with fogged up windscreens is a breeze. Flex your right foot and you get by in an instant, and if you need to, tug on the paddle and the gearbox is super quick to respond. The best part is it rarely second guesses you, so it does exactly what you want and that’s what Hormazd really liked. Coming down through the ghats, one to two successive paddle pulls, and gear changes are delivered quickly and without hesitation. A side note: in very-low-speed traffic, it does trip up, fumbling between first and second gears.

The monsoons have also put the suspension to the test. While I like the ride and handling overall, my preference leans towards handling, with a firmer setup. And although this means you don’t have a cushy ride over the rough stuff, it also means it does not bottom out on the many potholes and sharp edges that are literally everywhere.

The wet stuff has managed to trip up the rearview camera though. On two occasions – both during a heavy downpour – the feed began to stutter rapidly, making it impossible to see and judge your parking. It’s most likely moisture or water related and might disappear come drier days, but in any case, we will have the dealership inspect the connections as it’s not a screen issue.

That aside, the monsoons have been a breeze for the Kushaq. Even the AC, which used to struggle maintaining low temperatures in the summer heat, does just fine in weather like this. Fuel efficiency has not dropped too much, either. A slower pace overall has seen me get single-digit figures – around 7kpl – but in freer-moving traffic, it does rise to low two digits. That’s thanks to the cylinder-deactivation function, which, during steady low-load cruising, shuts down two cylinders for better efficiency. I’m definitely going to hang onto this one until the rains stop. I’ve got an out-of-town trip planned, and so far I’ve not had to contend with water-logged and flooded streets. But if I do, the Kushaq’s 155mm laden ground clearance will certainly come in handy.

Skoda Kushaq Monte Carlo long term review, 12,200km report

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One of the issues regarding information on the web is ensuring authenticity, especially in regards to government information. The GPO recently announced they will be soon begin using public-key infrastructure and digital signatures to ensure authenticity of documents released online....

Summary: The abundance of X.509 certificate authorities who already perform identity proofing for businesses provides a rich resource that can be leveraged to boot the verifiable data ecosystem.

When you used a verifiable credential to prove something about yourself, the verifier can know cryptographically: (1) the identifiers for the issuer, (2) the credential hasn't been tampered with, (3) the credential was issued to you, and (4) the credential hasn't been revoked. These four checks are important because their establish the fidelity of the data being transferred. They don't, however, tell them whether they can trust the issuer. For that, they need to take the issuer's decentralized identifier (DID) that they got from credential presentation and determine who it belongs to.

At the most recent Internet Identity Workshop, Drummond Reed gave a session on how X.509 certificates could help with this. The first step, like always, is to resolve the DID and retrieve the DIDDoc that associates keys and endpoints with the DID. The endpoint can be an HTTP server and, of course, should have an X.509 certificate providing TLS security. That certificate, at the very least, has a a domain name to bind that to the certificate's public key. It can, if you pay for the feature, also include information about the entity that applied for the certificate. The certificate authority proofs that information and is vouching for it when they sign the certificate.

The key to making the X.509 certificate useful for checking the provenance of a DID lies in one key change. X.509 certificates can contain and extended field called a Subject Alternative Name. This following figure shows how it can help.

In this figure:

1. The issuer (Attestor) creates the DID they will use to issue the certificate along with its associated DIDDoc, including an HTTP endpoint for DID verification.
2. Attestor applies for a X.509 certificate for that endpoint, including in the application the DID they created in (1).
3. The certificate authority does it's usual proofing of the application and issues a certificate that includes the DID in the Subject Alternative Name field.
4. The issuer creates a credential definition in the usual way that includes their DID and writes it to whatever Verifiable Data Registry their DID method dictates.
5. Attestor issues a credential to a holder (Alice) using that credential definition.
6. At some later time, Alice presents the credential to the verifier (Certiphi).
7. Certiphi resolves the DID to get the DIDDoc and retrieves the verfication endpoint from the DIDDoc
8. Certiphi retrieves the certificate for that endpoint¹.
9. Certiphi verifies the certificate by checking it's signature and ensures that the DID in the DIDDoc for the credential matches the one in certificate.²

The issuer's DID has now been tied in a verifiable way to whatever information is in the certificate. Provided the certificate includes information about the entity beyond the domain name, the verifier can use that information to determine whether or not the credential is authentic (i.e., issued by who the credential definition purports issued it). That might be all the evidence they need to determine whether to trust the entity. Certificate authorities could also issue verifiable credentials to the customer attesting the same verified claims—after all, it's one more product they can offer.

The benefit of doing issuer validation using X.509 certificates is that there are already many trusted X.509 certificate authorities in business who already do proofing of attributes about businesses. That's a huge chunk of the verifiable data ecosystem that doesn't need to be built because it can be leveraged. To make this work, digital certificate authorities would need to start offering to validate DIDs and include them in a certificate as a Subject Alternative Name. I don't discount that this will take some bureaucratic maneuvering. Certificate authorities will need to see a business opportunity. I'd love to see Digitcert or someone do a pilot on this.

Notes

1. Note that this step might be combined with the previous step if the Verifiable Data Registry is the same server as the endpoint, but that's not necessarily going to be the case for a number of reasons.
2. Note that this does not create a call back wherein Attestor can determine which credential was used, preserving the privacy of the presentation. Attestor does know one of its credentials has been presented to Certiphi. If this information leakage bothers you, then any web-based DID method is potentially a problem.

Tags: identity ssi decentralized+identifiers verifiable+credentials x.509