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Author Archives: Martin

Unwanted macOS connection requests

Posted on March 6, 2018 by Martin

Even though I didn’t initiate anything, popups in macOS popped up a few times asking me to allow a connection request from my (?) iPhone which is already paired with my computer. The device name matched the device name of my … Continue reading Unwanted macOS connection requests→

Posted in iOS, macosx, malware | Tagged Bluetooth

If hash values are same, they lessen security. Why?

Posted on January 31, 2018 by Martin

I know that if hash values are same , then the security of the system is reduced.
For example: If two timestamps create same hash values, they lessen security.
Why is that? What are reasons?

The scenario is: There is a sec… Continue reading If hash values are same, they lessen security. Why?→

Posted in hash

"Flow" between computers (Logitech mouse)

Posted on December 3, 2017 by Martin

Logitech (and possibly other) mice offer a feature called “flow”: mouse can pair with uop to 3 devices (PC, handheld, …), and can mark, copy & paste content (even files) between these 3 devices (according to the description, not boug… Continue reading "Flow" between computers (Logitech mouse)→

Posted in attack-prevention, attack-vector

what are the risks associated with an incomplete certificate chain

Posted on July 7, 2017 by Martin

What are the actual risks associated with an incomplete certificate chain

I read about certificate chains and I think I understand the concept but I seem to not understand the potential risks, for instance SSLLabs checks and… Continue reading what are the risks associated with an incomplete certificate chain→

Posted in certificates, TLS, trust

Do I have a current MITM?

Posted on June 12, 2017 by Martin

I apologise for to terseness of this question; I have an issue. Google.co.uk is failing its HSTS on my browsers.

Is this an issue with google.co.uk or is this just me? Is someone middle-manning my internet connection?

Whi… Continue reading Do I have a current MITM?→

Posted in HSTS

Is Orbot android TOR client compromised (permissions to device ID and caller information)?

Posted on June 8, 2017 by Martin

During today’s apps update, ORBOT update asks for aditional permissions: a) photo/media/files, and b) Device ID and caller information.

(Android 5.0.1, current ORBOT (pre-update) 15.2.0-RC-8-multi)

Why would an app, with th… Continue reading Is Orbot android TOR client compromised (permissions to device ID and caller information)?→

Posted in Android, tor

understanding the "Offering RSA public key" step during SSH connection initialization

Posted on February 28, 2017 by Martin

During SSHv2 connection initialization, there is a following debug message:

debug1: Offering RSA public key: /home/user/.ssh/id_rsa

Am I correct that actually no public key is sent to server? In addition, /home/user/.ssh/id_rsa is my pr… Continue reading understanding the "Offering RSA public key" step during SSH connection initialization→

Posted in ssh

understanding the "Offering RSA public key" step during SSH connection initialization

Posted on February 28, 2017 by Martin

During SSHv2 connection initialization, there is a following debug message:

debug1: Offering RSA public key: /home/user/.ssh/id_rsa

Am I correct that actually no public key is sent to server? In addition, /home/user/.ssh/i… Continue reading understanding the "Offering RSA public key" step during SSH connection initialization→

Posted in ssh

How to approach replacing md5 for transporting Unity game data to a remote server

Posted on January 2, 2017 by Martin

TL;DR

I am working on a gaming system that uses UnityScript and C# on the client and PHP on the server. A MD5 hash of the data plus a shared secret is used to check that the data has not been modified in transit. Is MD5 good… Continue reading How to approach replacing md5 for transporting Unity game data to a remote server→

Posted in gaming, MD5, net, PHP

Are there any security related disadvantages if multiple ssh-agents are running?

Posted on December 28, 2016 by Martin

I have configured my ~/.profile file(bash login shell startup file) in a way that it starts ssh-agent automatically. It doesn’t check if there is a ssh-agent already running. Are there any security related disadvantages if mu… Continue reading Are there any security related disadvantages if multiple ssh-agents are running?→

Posted in OpenSSH, ssh

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