Articles in the Blog category

1. Telegram (and some others) have a weird TCP timeout during the TLS handshake over IPv6

   For the last two months telegram and some others have showed a weird behaviour:

   1. DNS responds …

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2. Optimise sqlite3 1.4 million rows access

   I am running a small python3 service that checks some TLS certificates with a systemd timer …

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3. How to secure a hardened, minimal QNAP installation with letsencrypt

   There is a simple rule for hardening a system: You can not hack what is not …

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4. Disable qnap App Center auto updates and do them yourself with a schedule

   Qnap has decided to enable automatic updates for apps as well. This caused the admin interface …

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5. Proposing a new key recovery algorithm for multiple decryption keys

   This is part of my master thesis that I'm about to finish currently.

   The algorithm

   

   I …

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6. XFS fsfreeze bug appears to be fixed in kernel 5.10.x

   Over two years ago I discovered a kernel bug #205833 where a close operation on a …

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