Using sha256sum command for ensuring file integrity

1.0 SHA-2 A cryptographic hash function (CHF) is an algorithm to map arbitrary size data, called the message, to a fixed sized bit array, called the hash value, or message digest. It is a one way function. It is not feasible to generate the original message from the hash value. A small change in the …

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Simple Screen Recorder records only a black screen

1.0 Problem Simple Screen Recorder program records only a blank black screen on Ubuntu Linux. 2.0 Solution The problem is solved with the following steps. Close all programs. Log out. Start a fresh login procedure. Click on the user name. Before entering the password, find the gear icon in the bottom right corner of the …

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Audacity: The cursor is not moving over the waveform during playback

1.0 Problem The cursor does not move over the waveform during playback. It does not update during playback. 2.0 Solution The problem was resolved with the following steps. Close any open Audacity session. Go to the /usr/share/applications directory. Open the file, audacity.desktop, in an editor. Find the line, Exec=audacity %F Replace it with, Exec=env GDK_BACKEND=x11 …

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Chromecast not connecting to Wifi

1.0 Problem A change of Wifi network necessitated that the same be changed for a working chromecast device. When the chromecast was reconfigured using the Google Home app, it would not communicate with the new Wifi network. An error message was printed and the configuration session would end. 2.0 Solution The problem was solved by …

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Program to generate a random password in C

1.0 Introduction Passwords provide a level of security for digital assets. To be effective, passwords need to sufficiently long. random and chosen from a big underlying domain.In this post, we have a C-language program, that takes in number of characters in the password as input, and chooses a random password from printable ASCII characters. The …

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