Computers

Windows md5 checksum

I was sent a script to run by an analyst who advised to verify the MD5 hash. This is good advice to ensure that I receive the correct content. And happens to be the advise I gave the DBA manager before restoring backup files that was going to take hours to download.

The idea is creating an MD5 hash from the file contents is a fingerprint that tells me whether the file is the same or different quickly and easily. The analyst tells me the hash of the file on the source. I generate a hash on the destination and compare. If they differ, then we have a problem.

I do this all the time on Linux. However, the application I was working with is on Windows. And uploading the file to a Linux server from my workstation wouldn’t really tell me if the file on the Windows server has the correct hash as corruption (ever so unlikely) could have happened over one upload but not the other.

So, I was curious if there was a way to do this on Windows. Turns out there is.

certutil -hashfile C:\scripts\filename.sql MD5

The certutil.exe command is a program installed as part of Certificate Services used typically to view SSL information. (I used it via Powershell, but I bet it works via CMD too.) The various flags available makes it look like something extremely useful to know exists. And, I am surprised at never having seen it prior to today.

It takes seconds to share

News entities are putting this ultimate clickbait in the missing persons articles. And people fall for it hook, line, and sinker.

I see a Facebook post a day where someone is missing. And found before my friend posted it. Usually the person has been fine for months.

It would be nice if Facebook would indicate prominently above the post the person is no longer missing.

Android app updates

An Android app I needed to use refused to allow me into it unless I updated it.

BONUS: Every time I hit the update button, it took me to the iTunes Store.

So, I went to the Google Play Store. It said I had the current version. So, I visited the store from a laptop computer which said I was two minor versions behind. (2.0.9 was current and I had 2.0.7.)

I tried re-installing the app. It installed 2.0.7 again.

I tried the nuclear option deleting the cache & data and then restarting the phone. When it came back, it recognized that it needed an update.

In retrospect, maybe the Google Play app needed to be the one I deleted the cache for? It seems the problem was it not getting the new information about apps.

15 days of fame

Screenshot 2019-09-03 11.03.37 Looks like the storm of visitors to this blog looking for information on that fake video circulating Facebook is over. Most of the searches were for the hostname of the server which I happened to mention in the post. Which, I guess put me to the top of the search results.

One individual found me on Facebook and accused me of being the creator of the video because I mentioned it on my blog. Of course, I had her read the blog post for help addressing her account to getting the hacker’s session kicked out and securing it.

A Dunbar model in social media

This made me wonder about the possibilities of a better model.

Fifteen years into the Facebook era, it’s well established that people aren’t actually friends with the hundreds or thousands of Facebook friends they may have. They couldn’t be if they tried—research has found that there seems to be a limit to the number of social connections a human brain can manage. Robin Dunbar, an anthropologist at the University of Oxford, is the most famous proponent of this theory, and his estimate of 150—known as “Dunbar’s number”—is often cited as the (approximate) number of casual friends a person can keep track of. There are different Dunbar numbers for different levels of closeness—concentric circles, if you will. The smallest circle, of five friends, consists of someone’s most intimate friendships. One can keep track of 15 close friends, and 50 pretty close friends. Expanding out from the 150 casual friends, this research suggests that the brain can handle 500 acquaintances, and 1,500 is the absolute limit—“the number of faces we can put names to,” Dunbar writes.

I’ve mentally categorized them as:

  1. Must Friends (support clique) : 5 people : a best friend, a member of your inner circle, a person you count on when something big happens in your life
  2. Trust Friends (sympathy group) : 15 people : a friend who shows integrity, someone you feel comfortable with, that you’re always glad to see, but not in your inmost circle; perhaps someone you’d like to be closer to if you had the time or opportunity
  3. Rust Friends (close friends) : 50 people : a person you’ve known for a long, long time; you’re probably not going to get any closer to that person unless something changes, but a part of your life
  4. Just Friends (casual friends) : 150 people : a person you see — at a weekly poker game, at your child’s school — who is enjoyable company, but you have no desire to socialize outside a specific context or to get to know that person better
  5. Acquaintances : 500 people
  6. Facial Recognition : another 780 (bringing total up to 1,500)

The Facebook algorithm is already looking for how much we engage with individuals in order to decide which content to show us on the Newsfeed. By deciding which people are important to us, they are in effect, modeling the Dunbar theory for us. Just in the shadows without allowing us to veto or decide on it. Well, sort of, we have the options for “Close Friends” and “Acquaintances” which seem to be taken from Dunbar albeitly at the wrong levels.

It seems plausible that Facebook could formalize the model further by just adding three more levels. They could automatically mark people based on their interpretation of our behavior with the person. And then also allow us to override it by changing the mark. That could help Facebook understand our idealized state of the relationship to better improve the Newsfeed. People leave the service because of frustrations about what they see. For some, that is too much about acquaintances and not enough about close friends. (The algorithms are showing unwanted content based on misunderstanding the individual, who doesn’t understand how to like the correct things to optimize the Newsfeed.)

Then again, I am probably one of the few Homo Roboticus using social media who would appreciate this. Most people probably would find it overwhelming.

Fb Messenger virus

Got a message from a coworker that suggested I was in a video. Naturally, I am supposed to click on it, but it felt wrong. A quick Duck Duck Go search revealed it to be a virus.

If you think a virus was installed on your device, then my advice is to find a trusted anti-virus software to scan your computer. There are also malware apps to scan & protect your phone. Some carriers offer them for free.

Some reports suggest if you click on it, then you get a Facebook login page.

Only, it is not a real one and designed to capture your credentials. That gives another party your credentials so that they can:

  1. send this out as messages to your contacts
  2. capture more information from your account

If you fell for the 2nd login issue, then my advice is to:

  1. Immediately change your password.
  2. Kick off all sessions in the “Security and Login” page. There is a “Log Out Of All Sessions” option.
  3. Also in the security section, setup two-factor authentication.
  4. Turn on getting alerts about unrecognized logins.

Of all the things I can report, I cannot report this?

It seems like Facebook should be able to detect this virus or phishing by now. What I can see of the link goes to a Facebook server: si-chao.cstools.facebook.com  So, at least the link to virus/phishing is on their servers enough that they could check for its presence.

The person who sent it me says the account was locked out for 24 hours for behaving suspiciously. The act of sending hundreds of messages in a few seconds alerted Facebook to automated behavior. So, these are accounts they could be checking for being compromised.

Juggling Social Roles in Social Media

Browncoat (from show Firefly) polo
Juggling the dual role of worker bee and geek by wearing a business casual geek shirt

Sociology has a concept of us holding multiple social roles. At home, I am both a husband and a father. With relatives, I am a son, nephew, or cousin. At work, I am a supervisee, mentor, subject matter expert, or organization historian. Things get a bit more undefined out in the wider world, but I hold social roles out there too.

Each of these social roles vary in the expectations of behavior. So, our behavior may vary depending on which role we are occupying at a given time. And, even more interesting is when we have to juggle multiple social roles AT THE SAME TIME for the first time. The more experience we attain at doing something, the better we get at figuring out the constraints and minefields in a situation.

The human brain devotes a large amount of processing to managing the information about the behavior of others to determine trust. And also ensuring our own behaviors are trustworthy. (You’ve read my prior stuff on Dunbar, right? 1, 2)

Perhaps part of the stress inducing nature of social media is the mixing of these social roles? A giant social network like Facebook means having a variety of relatives, coworkers, and friends mixing in the same spaces. People who come from different backgrounds, political viewpoints, education levels, interests, and levels of restraint. Navigating all this probably generates a ton of stress.

If so, then we need more segmentation.

  1. Limit coworkers to more work appropriate social networks like LinkedIn.
  2. Join topic groups and post content related to it there. To talk about politics, join groups that discuss it. (Be careful to avoid echo chamber groups.)
  3. A private place to discuss more openly with friends. Maybe a private twitter account, a private Facebook group, group chat, etc.
  4. A private place to discuss more openly with family.

Reward Tracking and Product Recalls

booth branding business buy
Photo by Pixabay on Pexels.com

Stores like for us as consumers to give them a customer ID to track what it is that we are buying. Many have phone number or a card or an email address. They use this information to track our purchases and personalize their nudges for us to buy products.  There is one way they might improve customer loyalty: Recall notices.

I pay attention to the news, so I see recalls every week. But, I doubt I am seeing them all. And, I doubt that I can reliably say whether I have the recalled item. But, the store where I bought it probably does.

A couple years ago, I was in a grocery aisle mulling over what to select when a manager came through to take off the shelf something nearby. He had a scanner which told him the information about the recalled item.

What would be really cool is if the system that is telling the stores what to pull from their shelves, looks through the customer purchases and informs the customers. They could pass along the recall notice and let the customer identify the lot number the same as the store. (I knew the manager was working a recall notice because he was talking to himself.)

Thinking maybe this already exists as an opt-in, I checked the stores where we have web site accounts. Nothing. (Given these places tend to go with an opt-out model, I was not surprised.)

Friendship Placebo

Social media plays with our minds in allowing us to stay connected to old friendships. We feel like we are maintaining the relationship. But, it lacks something.

Social media tends to bring out our worst. We portray ourselves at our best. We compare our worst to others’ best. Assumptions, gossip, and negativity abound.

It really isn’t a friendship anymore. But, we still want it to be. So, like a placebo we trick ourselves into thinking it fulfills that hole in our soul.