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The internal mechanisms of PostgreSQL allow it to be very fast in some situations and 'not so much' in others.

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Delta Chat is a messenger that operates without its own servers, using email for message exchange. Messages are automatically encrypted using the Autocrypt standard, which is based on OpenPGP. Opportunistic encryption is used by default, but verified contacts can be created by scanning a QR code from another device. New features in version 1.2 include the ability to pin chats and non-blocking addition of contacts using a QR code. […]

PostgreSQL Antipatterns: fighting the hordes of "dead" records

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The peculiarities of how PostgreSQL's internal mechanisms operate allow it to be very fast in some situations and 'not so much' in others. Today, we will focus on a classic example of the conflict between how the DBMS operates and what developers do with it—UPDATE vs the principles of MVCC. A brief overview from an excellent article: When a row is modified by an UPDATE command, effectively two operations are performed: […]

MVCC-3. String versions

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So, we discussed the issues related to isolation and made a digression about organizing data at a low level. Finally, we have reached the most interesting part—row versions. Header: As we have stated, each row can simultaneously exist in the database in several versions. One version must be distinguishable from another. To achieve this, each version has […]

WhatsApp will introduce a message auto-delete feature

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Recently, the popular messaging app WhatsApp received support for dark mode, but this does not mean that developers have stopped working on new features. However, this time users can expect something that has been available for years in competing messengers. This refers to the automatic deletion of messages. The beta versions of WhatsApp 2.20.83 and 2.20.84 introduced the option to set […]

DDR4 memory chips remain vulnerable to RowHammer attacks, despite added protections

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A group of researchers from the Vrije Universiteit Amsterdam, the Swiss Federal Institute of Technology Zurich, and Qualcomm conducted a study on the effectiveness of the defense mechanisms against RowHammer attacks implemented in modern DDR4 memory chips, which can alter the contents of individual bits in dynamic RAM (DRAM). The results were disheartening, as DDR4 chips from major manufacturers remain vulnerable (CVE-2020-10255). The RowHammer vulnerability allows for the corruption of specific contents […]

Wine 5.4

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On March 13, Wine 5.4 was released. Wine is a compatibility layer for running Windows applications on POSIX-compliant operating systems, translating Windows API calls to POSIX calls on the fly instead of emulating Windows logic like a virtual machine. Besides more than 34 bug tracker fixes, the new release includes: Unicode updated to version 13 Built-in programs now use the UCRTBase C runtime Improved support […]

Cryptographic ARM based on open key standards for the Android platform

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It's time to demonstrate how the cryptographic ARM based on public key standards cryptoarmpkcs works on one of the mobile platforms, namely Android. The concept laid out during the development of the cryptoarmpkcs utility is that the user should experience minimal inconvenience when creating and verifying electronic signatures. That's why we propose as the key carrier for the personal certificate […]

Vulnerability in the Bluez Bluetooth stack

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A vulnerability (CVE-2020-0556) has been discovered in the open Bluetooth stack BlueZ, which is used in Linux distributions and Chrome OS, potentially allowing an attacker to access the system. Due to improper access validation in the implementation of Bluetooth profiles HID and HOGP, the vulnerability permits denial of service or privilege escalation when connecting a malicious Bluetooth device without completing the device bonding process. The malicious Bluetooth device […]

Update of the distribution for creating home theaters LibreELEC 9.2.1

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The release of LibreELEC 9.2.1, a fork of the OpenELEC distribution for creating home theaters, has been published. The user interface is based on the Kodi media center. Images are prepared for loading from USB drives or SD cards (32- and 64-bit x86, Raspberry Pi 1/2/3/4, and various devices with Rockchip and Amlogic chips). The new version adds a section in the configurator for setting up VPN use […]

Release of Wine 5.4 and Wine Staging 5.4

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An experimental release of the open WinAPI implementation — Wine 5.4 — has occurred. Since the release of version 5.3, 34 bug reports have been closed, and 373 changes have been made. The most significant changes include: Built-in programs have been transitioned to use the new C runtime UCRTBase; Improved support for domain names containing characters from national alphabets (IDN, Internationalized Domain Names); Direct2D now includes support for drawing rectangles with […]

Update RouterOS on your MikroTik

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On the evening of March 10, Mail.ru's support service began receiving complaints from users about the inability to connect to Mail.ru's IMAP/SMTP servers through mail clients. Some connections were unsuccessful, while others displayed a certificate error. This error is caused by the 'server' giving a self-signed TLS certificate. Over two days, more than 10 complaints came from users across various networks […]

How we migrated a distributed team of several hundred people to SAAS

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Collaboration is a sore point for traditional office tools. When ten people are working on a file simultaneously, more time and effort are spent on tracking changes and their authors rather than making edits. This is complicated by numerous applications that are not always compatible. One way to address this issue is to switch to cloud-based office suites. There are not many options available, […]

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