Alexandre Sieira
@alexandresieira.bsky.social
Information security entrepreneur and early stage investor. Co-Founder and CTO at Tenchi Security. Cloud Security Posture Chiropractor.
I hope my email finds you (at the bottom of a) well.
November 23, 2025 at 11:40 PM
I hope my email finds you (at the bottom of a) well.
Reposted by Alexandre Sieira
If you would like for me to come to your conference or convening and give a 45-minute rant about what makes good digital privacy trainings and guides, particularly for high-risk populations, hit me up.
September 21, 2025 at 2:35 AM
If you would like for me to come to your conference or convening and give a 45-minute rant about what makes good digital privacy trainings and guides, particularly for high-risk populations, hit me up.
Just got this e-mail from #AWS:
"Thank you for your participation in the preview of our Firehose CDC solution. (...) After careful consideration, we have decided not to proceed with general availability of this feature due to business reasons."
"Thank you for your participation in the preview of our Firehose CDC solution. (...) After careful consideration, we have decided not to proceed with general availability of this feature due to business reasons."
August 25, 2025 at 1:46 PM
Just got this e-mail from #AWS:
"Thank you for your participation in the preview of our Firehose CDC solution. (...) After careful consideration, we have decided not to proceed with general availability of this feature due to business reasons."
"Thank you for your participation in the preview of our Firehose CDC solution. (...) After careful consideration, we have decided not to proceed with general availability of this feature due to business reasons."
Reposted by Alexandre Sieira
DW News fact checks videos allegedly showing solar panels burning in Spain due to the heatwave.
False! And the original source of the misinformation won’t surprise you.
YouTube Short: youtube.com/shorts/DVkNR...
#Facts #Misinformation
False! And the original source of the misinformation won’t surprise you.
YouTube Short: youtube.com/shorts/DVkNR...
#Facts #Misinformation
Fact check: Are solar panels in Spain really catching fire?
YouTube video by DW News
youtube.com
August 23, 2025 at 8:43 AM
DW News fact checks videos allegedly showing solar panels burning in Spain due to the heatwave.
False! And the original source of the misinformation won’t surprise you.
YouTube Short: youtube.com/shorts/DVkNR...
#Facts #Misinformation
False! And the original source of the misinformation won’t surprise you.
YouTube Short: youtube.com/shorts/DVkNR...
#Facts #Misinformation
Reposted by Alexandre Sieira
In this episode of the Chasing Entropy Podcast, I welcome industry analyst and long-time cybersecurity veteran Fernando Montenegro for a far-ranging and refreshingly honest discussion about the evolution of security, the realities of AI, and stories
Link: www.buzzsprout.com/2497520/epis...
Link: www.buzzsprout.com/2497520/epis...
August 13, 2025 at 12:36 AM
In this episode of the Chasing Entropy Podcast, I welcome industry analyst and long-time cybersecurity veteran Fernando Montenegro for a far-ranging and refreshingly honest discussion about the evolution of security, the realities of AI, and stories
Link: www.buzzsprout.com/2497520/epis...
Link: www.buzzsprout.com/2497520/epis...
Reposted by Alexandre Sieira
I recommend a daily cognitive fitness regimen of exercises like "reading and writing your own emails" and "taking your own notes"
I do firmly believe that refusing to outsource your basic cognitive functions to LLMs right now - as so many are stumbling over themselves to do right now, like hogs trotting to a pile of slop that’s been set up inside of a butcher’s delivery truck - will very much pay off in a few years.
July 28, 2025 at 9:34 PM
I recommend a daily cognitive fitness regimen of exercises like "reading and writing your own emails" and "taking your own notes"
Reposted by Alexandre Sieira
A sobering read and reminder that #cyber attacks and #ransomware attacks in particular can have devastating real world effects. A 150+ Yr old company out of business because of an easily guessable password. It could happen to any of our organisations. #WeakestLink www.bbc.co.uk/news/article...
Weak password allowed hackers to sink a 158-year-old company
Transport company KNP forced to shut down after international hacker gangs target thousands of UK businesses.
www.bbc.co.uk
July 21, 2025 at 5:31 AM
A sobering read and reminder that #cyber attacks and #ransomware attacks in particular can have devastating real world effects. A 150+ Yr old company out of business because of an easily guessable password. It could happen to any of our organisations. #WeakestLink www.bbc.co.uk/news/article...
'I'm being paid to fix issues caused by AI'
'I'm being paid to fix issues caused by AI'
Businesses that rush to use AI to write content or computer code, often have to pay humans to fix it.
www.bbc.com
July 6, 2025 at 3:58 PM
'I'm being paid to fix issues caused by AI'
Reposted by Alexandre Sieira
CVE-2025-6543 (citrix 🩸) hit KEV. that means confirmed exploitation with receipts. will wash dishes for payloads. bob [@] greynoise [.] io (some mastodon clients really bork email addresses) if you have'm.
June 30, 2025 at 5:52 PM
CVE-2025-6543 (citrix 🩸) hit KEV. that means confirmed exploitation with receipts. will wash dishes for payloads. bob [@] greynoise [.] io (some mastodon clients really bork email addresses) if you have'm.
Reposted by Alexandre Sieira
Me when I see long lived access keys.
June 29, 2025 at 8:39 PM
Me when I see long lived access keys.
Is AI a con? A new book punctures the hype and proposes some ways to resist
Is AI a con? A new book punctures the hype and proposes some ways to resist
AI slop means faster and cheaper content, and the technical and financial logic of online platforms creates a race to the bottom.
theconversation.com
June 29, 2025 at 9:17 AM
Is AI a con? A new book punctures the hype and proposes some ways to resist
Reposted by Alexandre Sieira
Insecure code? Need some training? Call me! Funny memes included!
https://twp.ai/9PShQw
https://twp.ai/9PShQw
June 27, 2025 at 5:01 PM
Insecure code? Need some training? Call me! Funny memes included!
https://twp.ai/9PShQw
https://twp.ai/9PShQw
Reposted by Alexandre Sieira
Mandiant is now aware of multiple incidents in the airline sector that resemble Scattered Spider. The industry should button up its call centers where this actor has had a lot of success with social engineering. www.axios.com/2025/06/27/a...
A prolific hacking group that's shutdown retailers and insurance companies turns to aviation
A cyberattack on WestJet last week is likely tied to the Scattered Spider gang, a source tells Axios.
www.axios.com
June 27, 2025 at 5:28 PM
Mandiant is now aware of multiple incidents in the airline sector that resemble Scattered Spider. The industry should button up its call centers where this actor has had a lot of success with social engineering. www.axios.com/2025/06/27/a...
Reposted by Alexandre Sieira
Huge implications from this: Microsoft cut off the email of the chief prosecutor of the International Criminal Court, because of his work on Israel www.nytimes.com/2025/06/20/t...
June 20, 2025 at 6:18 PM
Huge implications from this: Microsoft cut off the email of the chief prosecutor of the International Criminal Court, because of his work on Israel www.nytimes.com/2025/06/20/t...
Reposted by Alexandre Sieira
I am so grateful we saved a few million bucks by DOGEing the Voice of America's Farsi service. There's no possible value in having a way to send the Iranian people a message.
Oh, wait, maybe it was incredibly stupid and shortsighted. Yeah, I'm going with that. DOGEy, even.
Oh, wait, maybe it was incredibly stupid and shortsighted. Yeah, I'm going with that. DOGEy, even.
June 20, 2025 at 5:48 PM
I am so grateful we saved a few million bucks by DOGEing the Voice of America's Farsi service. There's no possible value in having a way to send the Iranian people a message.
Oh, wait, maybe it was incredibly stupid and shortsighted. Yeah, I'm going with that. DOGEy, even.
Oh, wait, maybe it was incredibly stupid and shortsighted. Yeah, I'm going with that. DOGEy, even.
Reposted by Alexandre Sieira
Reposted by Alexandre Sieira
I suspect that fact that the vast majority of LLM users don’t seem to have received this (really very simple!) message is because the AI companies have a vested interest in us not understanding it. “ChatGPT is smart, it just makes mistakes sometimes” is much more marketable than the truth.
Chatbots — LLMs — do not know facts and are not designed to be able to accurately answer factual questions. They are designed to find and mimic patterns of words, probabilistically. When they’re “right” it’s because correct things are often written down, so those patterns are frequent. That’s all.
June 19, 2025 at 11:36 AM
I suspect that fact that the vast majority of LLM users don’t seem to have received this (really very simple!) message is because the AI companies have a vested interest in us not understanding it. “ChatGPT is smart, it just makes mistakes sometimes” is much more marketable than the truth.
Understanding the Power and Limits of Generative AI www.linkedin.com/pulse/unders...
Understanding the Power and Limits of Generative AI
If you read the copius material made available online by experts (real or otherwise) and executives of companies deeply invested in generative AI, you would think we are a step away from the technolog...
www.linkedin.com
June 18, 2025 at 11:29 AM
Understanding the Power and Limits of Generative AI www.linkedin.com/pulse/unders...
Reposted by Alexandre Sieira
Please come see my talk, "Security Champions Worst Practices" in room 115, at 11:30 at @owasp #owaspglobalappsec!
https://twp.ai/9PS7VE.
https://twp.ai/9PS7VE.
May 30, 2025 at 9:19 AM
Please come see my talk, "Security Champions Worst Practices" in room 115, at 11:30 at @owasp #owaspglobalappsec!
https://twp.ai/9PS7VE.
https://twp.ai/9PS7VE.
Reposted by Alexandre Sieira
The greatest job alert! My team at EFF is hiring and you could be on it: www.paycomonline.net/v4/ats/web.p...
Policy and Research Staff Technologist
...
www.paycomonline.net
May 24, 2025 at 2:13 AM
The greatest job alert! My team at EFF is hiring and you could be on it: www.paycomonline.net/v4/ats/web.p...
Reposted by Alexandre Sieira
This is going to sound rich coming from someone whose entire career is possible because of the internet and computers, but the world was legitimately a better place before we were “always online”.
Log off. Go outside. Trust me.
Log off. Go outside. Trust me.
May 17, 2025 at 1:58 PM
This is going to sound rich coming from someone whose entire career is possible because of the internet and computers, but the world was legitimately a better place before we were “always online”.
Log off. Go outside. Trust me.
Log off. Go outside. Trust me.
Reposted by Alexandre Sieira
To name a few independent journalists and outlets who're doing amazing work and deserve your subs, reads and dollars: @briankrebs.infosec.exchange.ap.brid.gy; @metacurity.com, @404media.co, @garbageday.email, @lawdorknews.bsky.social, @erininthemorning.com, @molly.wiki, @marisakabas.bsky.social.
i've had a shit week personally and four drinks tonight so strap in for a fuckin holler but i am so gd mad
indie media and self-employed journalists are doing the ding-dang WORK in highly precarious positions, with none institutional protections (not that the institutions can be relied upon) and
indie media and self-employed journalists are doing the ding-dang WORK in highly precarious positions, with none institutional protections (not that the institutions can be relied upon) and
a cartoon character is wearing a hoodie and smiling in front of a fire background .
Alt: a cartoon character is wearing a hoodie and smiling in front of a fire background .
media.tenor.com
May 3, 2025 at 1:35 PM
To name a few independent journalists and outlets who're doing amazing work and deserve your subs, reads and dollars: @briankrebs.infosec.exchange.ap.brid.gy; @metacurity.com, @404media.co, @garbageday.email, @lawdorknews.bsky.social, @erininthemorning.com, @molly.wiki, @marisakabas.bsky.social.