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Breno de Medeiros
Works at Google
Attended Johns Hopkins University
Lives in Sunnyvale, CA
1,699 followers|61,268 views


Breno de Medeiros

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Google SF office does have an amazing view.
(Today with +Breno de Medeiros )
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If you use a Mac or iOS device (iPhone, iPad), apply the latest security updates. They are critical for your security while online.
You MUST upgrade your iOS and OSX devices NOW to secure your network communications.

Apple SSL implementation is flawed and allows an attacker to intercept ALL encrypted (HTTPS) communication. Every iOS Apps are vulnerables (Safari, Facebook, Google+, Mail...) . On OSX Safari, iCloud, Mail and  many other apps  are also affected. Chrome is not affected on OSX.

Please it is very important that you  upgrade now as this vulnerability has been made public last night. In particular DO NOT connect to a public WiFi with an unpatched device.

To test if your device is vulnerable you can use the public website:

Help spread the word by re-sharing or +1 this post to ensure everyone promptly patch their devices.

For those interested in the technical details:
Apple cryptic patch notes After refers to a bug introduced in libsecurity_ssl which is the SSL library used by Apple ( This bug lead the SSL library to not check properly the hostname associated with a
given SSL cert which allows an attacker to easily snoop on any HTTPS site.
Mike Stay's profile photo
Is the Mavericks fix even available yet?
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Breno de Medeiros

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I don't know how to describe this technique. But the thief at least must trust that the police response will not be quick. The owner is reporting the theft pretty much immediately.
Neat car thief trick :)

#car   #security   #powned  
Maretha Davel's profile photo
In South Africa this would be too much trouble for a thief.  They usually just push a gun in your face and boot you out of the car.
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Breno de Medeiros

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Classy farewell from our esteemed Tim Bray. You will be missed! +Tim Bray
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Breno de Medeiros

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 One week ago I donated stem cells to help a child with a life-threatening illness, as part of the National Marrow Donor Program. I was able to do this because I had registered with them through their website, It's come to my attention that many people do not know about the Registry, and even fewer know that they coordinate blood stem cell transplants as well as traditional bone marrow transplants. So I wanted to share my experience for people who may be interested in becoming a potential donor, or just interested in how it works. I'll describe the process as briefly as I can; please post in the comments if you have questions, and I will answer them to the best of my ability.

1) In December 2012 I joined the Registry ( by checking the list of medical requirements to see if anything would exclude me, then requesting a registration kit. They sent me a packet which I used to take cheek swabs with a couple of big Q-tips, which I sent back, and they used those to do preliminary HLA typing (

2)  Almost two years later, patient needed a bone marrow or stem cell transplant and had no matching donor within the family. The patient's doctor searched the registry, and my HLA markers came up as a potential match. It's possible other registry members came back as potential matches as well.

3) The Registry contacted me the day before Thanksgiving to see if I was still willing to donate, and to complete a more thorough medical screening questionnaire.

4) I was asked to have a blood sample drawn so they could get a more accurate HLA profile, which I did at a lab near my home several days after the call (all appointments were coordinated by a specific person at the registry who would be my contact there throughout).

5) On New Year's Eve, I was informed that I was the closest match for this patient, asked if I was willing to donate to them, and we did the medical questionnaire again. I was informed that I would be donating peripheral blood stem cells (PBSC) (, not bone marrow. (Due to neck issues, I was deemed ineligible for the marrow collection procedure.)

6) I had an additional blood draw so they could run a full panel of tests for infectious diseases. Good news, I don't have syphilis! Or anything else!

7) I went to the Stanford Cancer Clinic for a physical so I could be medically clear for donation. The physical involved more blood draws (to run a blood chemistry panel), a chest x-ray, and an EKG. I was also given to chance to talk with a transplant doctor. Turns out I am super healthy. Believe me, nobody is more surprised by that than I am.

8) Once I was medically cleared to donate, the patient and his family would have been told that a matching donor was available, and he would have started preparation for the transplant through chemo and possibly radiation therapy (

9) Four days prior to the stem cell collection, I went back to Stanford for the first of five daily injections of filgrastim, which causes the blood stem cells in your bone marrow to multiply and to move out of the bone marrow and move freely through the bloodstream.

10) On days 2-4, I got the same injections at home, administered by a home health nurse. The injections can have side effects, but mine were fairly mild- mostly transient pain in the ribcage.

11) On collection day, I went to the Stanford Cancer Center Apheresis unit, where I got the final injection at 7:30am. Yes, I know, I was up at 7:30am. Your surprise is duly noted.

12) At 8:30am they began connecting me to the apheresis machine. The blood came out via my left arm, traveled through a centrifuge, and returned through the right arm. (The 'output' arm must remain completely still. The 'return' arm has some range of movement. I could use my iPad, but not type.) Due to the smaller size of the patient (a child), I was connected to the machine for just over 4 hours. During this time they used the centrifuge to filter out and collect 220ml of blood stem cells, and 300ml of plasma (the plasma was needed to dilute the stem cells, as they are too concentrated to give to a child by themselves).

13) Just after 1pm, they took one more blood sample to check my platelet count and unhooked me from the machine. It was a little low, so I've been advised to avoid sharp objects until my count is rechecked, which will happen on Tuesday. I was a little tired for a day but completely recovered within three days.

I may or may not ever find out what happens to the patient. Transplants arranged through the Registry are all anonymous-- the patient and donor are not given any identifying information beyond the age and sex of the donor/patient and what medical condition is being treated (the Registry asks that I not post the patient's exact age or condition on social media). Depending on the transplant center's policies, the anonymity may be waived after a year or longer, only if both parties agree. The patient's transplant center may or may not send updates on the patient's condition to the Registry. If they do, the Registry will pass the updates on to me, which was optional (I could have declined to receive updates).

So that's what it was like to donate peripheral blood stem cells to a stranger. With luck, his condition will be cured and he will live a normal life. All I know for certain is that his doctor determined that this transplant gave him the best chance of that happening.

A final note: I am not eligible to donate blood, because I lived on a military base in Germany in the 80's. I had figured this would also preclude marrow donation, but I never bothered to check on that assumption (which turned out to be erroneous-- don't assume like I did!) until my husband joined the Registry first, which spurred me to finally look into the requirements. So it was because of him that I ended up joining and had the opportunity to help this child. Though I was thanked repeatedly by every doctor and nurse I saw, the fact is that everyone who joins the registry is making a promise to donate should they turn out to be the best match for a patient. The fact that I was one of the 1-in-540 registered donors who actually goes on to donate does not make me any more exceptional than the millions of others who have registered. Even though the Registry now has about 9 million registered potential donors, thousands of people still die every year of conditions that may have been treated or cured if a matching donor were found. I'm making this inordinately long post in the hopes that you will spread the word about the Registry to anyone who may be interested in joining.

If you have any questions whatsoever about the procedure, requirements or amount of work/time involved in donating, please post them in the comments. I've posted a link (with permission) to the donor guide that the Registry gave me. Thanks for reading this.
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In his circles
264 people
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Software Engineer
  • Google
  • Google, Inc.
    Software Engineer, present
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Sunnyvale, CA
Baltimore, MD - Recife, Brazil - Tallahassee, FL
I work with Internet Identity, authentication and authorization protocols and identity infrastructure, from many angles: Design, development, deployment, and security aspects.

I enjoy hiking, reading, and watching movies.

  • Johns Hopkins University
    Computer Science
Basic Information
Kids enjoy watching the bakery operation. Good sandwiches.
Public - 6 months ago
reviewed 6 months ago
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