11,422 reputation
32954
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location Düsseldorf, Germany
age 40
visits member for 5 years, 4 months
seen 13 hours ago
Software developer, mathematician

Dec
21
comment Is there any software to analyze and detect 'fake' hi-res images (TIFF when really JPEG, deliberately upscaled images)?
Just a note for GIMP users: GIMP also supports LAB mode; it's under "Colors / Components / Decompose... / LAB".
Dec
17
comment How can I download the certificate of a wireless AP using 802.1X?
Thanks for the detailed writeup. It sounds a bit complicated; but if that's the simplest way to do it, I'll try.
Dec
17
asked How can I download the certificate of a wireless AP using 802.1X?
Dec
16
comment Make wpa_supplicant ignore server certificate trust
It should be pointed out that doing this can be a major security risk: When using username/password authentication, the client will broadcast its username and password to any fake AP, making them easy to harvest.
Dec
3
comment Accidentally deleted files from /boot
@user3109672: Just dowload one :-). The installation CDs of most Linux distributions also work as rescue CDs - ideally use the CD you installed from (or re-download it). Failing that, use any modern Linux rescue CD, for example Knoppix.
Dec
3
answered Accidentally deleted files from /boot
Dec
2
comment How to diagnose Run-time error 429?
It just might help if you actually tells us which program you are talking about...
Nov
26
comment How to check if a pixel is 100% transparent (transparency level)?
@JoeM: Yes. Actually, that should probably be in the answer. I edited it in.
Nov
26
revised How to check if a pixel is 100% transparent (transparency level)?
mention Shift-click for information window
Nov
17
comment Do text files store their encoding method for later decoding?
@OldGeezer: And BTW, file cannot do reliably detect most text encodings (because that is very difficult). The man page has some information on character set detection - file mostly only recognizes ASCII, UTF-8/16, EBCDIC, and ISO-8859-x. For example, a file encoded in KOI8-R is reported as "ISO-8859-1".
Nov
17
comment Do text files store their encoding method for later decoding?
@OldGeezer: file has various heuristics for determining file type and encoding. Mostly, it looks for certains strings or byte sequences in the file. If you want more specific information, you'll probably have to read the source. Or just ask a separate question :-).
Nov
1
comment How does a server get notified about the HTTP request?
@DhiwakarRavikumar: Yes, ports are just numbers. They are made up by a program or the operating system, they do not correspond to anything in hardware.
Oct
20
revised How to find out if a CPU has an MMU
more on systems w/o MMU
Oct
20
comment How to find out if a CPU has an MMU
@PaulA.Clayton: True. However, AFAIK, all common modern OSes use the MMU to implement memory protection, so these OSes do need an MMU for memory protection. Anyway, thanks for the information; I edited my answer to clarify.
Oct
16
awarded  Nice Answer
Sep
30
awarded  Explainer
Sep
26
awarded  Notable Question
Sep
24
awarded  Autobiographer
Sep
8
awarded  Famous Question
Aug
21
awarded  Good Answer