Category Archives: key

What do I need to consider when encrypting multiple (many) files (sometimes in differerent versions with only little difference) with the same key?

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I need to continuously encrypt a set of files so that I can send them to a group of people that I trust and who trust among themselves. Thus I would ideally use a symmetric encryption scheme with one key (but if need be, I can imagine to c… Continue reading What do I need to consider when encrypting multiple (many) files (sometimes in differerent versions with only little difference) with the same key?→

What do I need to consider when encrypting multiple (many) files (sometimes in differerent versions with only little difference) with the same key?

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I need to continuously encrypt a set of files so that I can send them to a group of people that I trust and who trust among themselves. Thus I would ideally use a symmetric encryption scheme with one key (but if need be, I can imagine to c… Continue reading What do I need to consider when encrypting multiple (many) files (sometimes in differerent versions with only little difference) with the same key?→

How can I compile and run Fortran/C programs on a shared remote server without exposing my code to other root users?

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I have access to a big remote server via SSH and I’m a root user on that server. However, there are multiple other root users who also have access to this server. I want to run some Fortran/C programs on this server, but I’m concerned abou… Continue reading How can I compile and run Fortran/C programs on a shared remote server without exposing my code to other root users?→

BLE Challenge-Response Authentication Using Pre-Shared Key and SHA-256

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I’m working on a Bluetooth Low Energy lock system and have implemented a challenge-response authentication flow for secure communication between the lock (an ESP32 device) and the user’s phone. I’m very new to these technologies, and was w… Continue reading BLE Challenge-Response Authentication Using Pre-Shared Key and SHA-256→

BLE Challenge-Response Authentication Using Pre-Shared Key and SHA-256

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I’m working on a Bluetooth Low Energy lock system and have implemented a challenge-response authentication flow for secure communication between the lock (an ESP32 device) and the user’s phone. I’m very new to these technologies, and was w… Continue reading BLE Challenge-Response Authentication Using Pre-Shared Key and SHA-256→

Find missing/masked characters from Bitcoin Private Key without knowing their position [closed]

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I am giving the following (masked) BTC Private Key:
L2nBmWGfAH5Vf9re41VhG6BgPx25rxqGmkbaPtG14jAPtBUzhQab
What I can tell you is that the key above has 3 incorrect characters in it at different random spots.
The incorrect 3 characters can b… Continue reading Find missing/masked characters from Bitcoin Private Key without knowing their position [closed]→