https://git.lysator.liu.se/nettle/nettle
https://www.cs.auckland.ac.nz/~pgut001/cryptlib/
https://gnupg.org/software/libgcrypt/
https://firefox-source-docs.mozilla.org/security/nss/index.html
https://nacl.cr.yp.to/box.html
https://github.com/NationalSecurityAgency
https://github.com/orgs/NationalSecurityAgency/repositories
http://nationalsecurityagency.github.io/
is same as a forking ipv6 server, but using clone(2) for posix threads instead of fork (copying entire process image).
currently only availible for linux / unix and gcc
client6.s and server6_clone.s can be compiled and linked with GNU make utility by using existing Makefile.
change directory to source and Makefile containing directory server6-clone.
rm -f client6 client6.o server6_clone server6_clone.o
ggcc "-Wimplicit-function-declaration" -o client6.o -c client6.c
client6.c: In function ‘ping’: client6.c:42:27: warning: embedded ‘\0’ in format [-Wformat-contains-nul] 42 | sprintf(inbuf, "%s\r\n\0", msg); | ^~ client6.c:49:16: warning: function returns address of local variable [-Wreturn-local-addr] 49 | return &outbuf[0]; | ^~~~~~~~~~ client6.c: In function ‘main’: client6.c:92:17: warning: implicit declaration of function ‘close’; did you mean ‘pclose’? [-Wimplicit-function-declaration] 92 | close(sd); | ^~~~~ | pclose gcc "-Wimplicit-function-declaration" -o client6 client6.o
gcc "-Wimplicit-function-declaration" -o server6.o -c server6.cgcc "-Wimplicit-function-declaration" -o server6 server6.o
./server6 program started... server trys listening on address 2600:1f18:7a3f:a700::6291 port: 7777 ./server6: cannot clone(2), trying to fork(2)./server6: offset: 1024, pagesze_offet: 4095, pa_offset: 0, sockets: s_sd=3, c_sd=4 ./server6: cannot clone(2), trying to fork(2)./server6: client request handled after sending/receiving 136 bytes total. ./server6 closed client socket descriptor 4 now, exiting in 1 secondchild pid: 231095child pid 231095 exited, status=0, done=1 ^C zen@virginia:~/prog/chat-ipv6/c-server6$ sudo ./server6 "2600:1f18:7a3f:a700::6291" 7777 ./server6 program started... server trys listening on address 2600:1f18:7a3f:a700::6291 port: 7777 ./server6: offset: 1024, pagesze_offet: 4095, pa_offset: 0, sockets: s_sd=3, c_sd=4 ./server6: client request handled after sending/receiving 136 bytes total. child pid: 231102 child pid 231102 exited, status=0, done=1 ./server6: offset: 1024, pagesze_offet: 4095, pa_offset: 0, sockets: s_sd=3, c_sd=5 ./server6: client request handled after sending/receiving 135 bytes total. child pid: 231107 child pid 231107 exited, status=0, done=1
winmake.bat
> echo "building now EchoServer classes..."
"building now EchoServer classes..."
> javac EchoServer.java
> echo "building now EchoClient class."
"building now EchoClient class."
> javac EchoClient.java
> dir *.class
Directory of C:\Users\heinr\source\chat-ipv6\java-server6
10/12/2024 03:40 3.188 EchoClient.class
10/12/2024 03:40 5.368 EchoServer.class
2 File(s) 8.556 byteszen@virginia:~/prog/chat-ipv6/java-server6$ make all rm -f *.class javac EchoServer.java javac EchoClient.java zen@virginia:~/prog/chat-ipv6/java-server6$ ls -al *.class -rw-r--r-- 1 zen mailers 3188 Dec 10 03:44 EchoClient.class -rw-r--r-- 1 zen mailers 5368 Dec 10 03:44 EchoServer.class zen@virginia:~/prog/chat-ipv6/java-server6$
zen@paris:~/prog/chat-ipv6/java-server6$ java EchoServer "172.31.20.156" "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5" 7777 server address set to 172.31.20.156 server address6 set to 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 Simple TCP Echo Server started ... Simple TCP Echo Server started ... EchoServer is listening on address 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 port 7777. EchoServer is listening on address 172.31.20.156 port 7777. Accepted connection to 2600:1f18:7a3f:a700:0:0:0:6291 (2600:1f18:7a3f:a700:0:0:0:6291) on port 58318. Receiving from socket: Finished, now sending back to socket: 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 => 2600:1f18:7a3f:a700:0:0:0:6291 uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov 6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux client socket close() Accepted connection to ec2-100-26-162-115.compute-1.amazonaws.com (100.26.162.115) on port 48304. Receiving from socket: Finished, now sending back to socket: 172.31.20.156 => ec2-100-26-162-115.compute-1.amazonaws.com/100.26.162.115 uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov 6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux client socket close()
uname -a "zen@virginia:~/prog/chat-ipv6/java-server6$ java EchoClient "2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5" 7777 "uname -a : `uname -a` " Receiving: 2a05:d012:209:ee00:a8ba:d6c4:bd60:bab5 => 2600:1f18:7a3f:a700:0:0:0:6291 uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov 6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux finished zen@virginia:~/prog/chat-ipv6/java-server6$ java EchoClient "13.38.136.165" 7777 "uname -a : `uname -a` " Receiving: 172.31.20.156 => ec2-100-26-162-115.compute-1.amazonaws.com/100.26.162.115 uname -a : Linux ip-172-31-57-91 6.8.0-1019-aws #21-Ubuntu SMP Wed Nov 6 21:21:49 UTC 2024 x86_64 x86_64 x86_64 GNU/Linux finished ^C
File.Copy, no matter if made with Windows Explorer, command copy, xcopy or programs, that use File.Copy Windows Api call, creates a new file or overwrites an existing file, where
Created Date = now,
Last Modified Date = Last modified DateTime of original file
File.Move, no matter if made with Windows Explorer, Command move or programs, that use File.Move Windows Api call, creates a new file or overwrites an existing file, where
Created Date = created DateTime of original file
Last Modified Date = Last modified DateTime of original file
File Write, no matter, if Console Application, Windows Application or Windows Service or what ever, creates a new or overwrites an existing file, where
Created Date = now
Last Modified Date = now
https://github.com/heinrichelsigan/cmdcopy [ releases ]
Siegfried Johannes Gottwald (* 30. 3. 1943 in Limbach; † 20. 9. 2015) war ein deutscher Mathematiker, Logiker und Wissenschaftshistoriker. Sein Hauptforschungsgebiet war Fuzzy Logic
https://www.researchgate.net/profile/Siegfried-Gottwald
Mein langjähriger Freund Bob (Robert Antonius Berezka) sah Anfang der 1990er in diesem Gebiet sehr großes Entwicklungspotential, das aber leider nicht genutzt wurde.
(1)
Trigger für Einschalten von Erneuerbaren Energie Mini- / Hobby- Kraftwerken, erst ab gewisser naturgegebener Eingangsleistung.
| ÖVP | 24% | (scharf) | 22% | - | 30% | (fuzzy) | |
| SPÖ | 20% | (scharf) | 18% | - | 24% | (fuzzy) | |
| FPÖ | 25% | (scharf) | 23% | - | 30% | (fuzzy) | |
| Grüne | 12% | (scharf) | 8% | - | 15% | (fuzzy) | |
| Neos | 10% | (scharf) | 9% | - | 12% | (fuzzy) | |
| KPÖ | 3% | (scharf) | 1% | - | 6% | (fuzzy) | |
| Bier | 5% | (scharf) | 4% | - | 8% | (fuzzy) |
if there is no huge sophisticated optimization in gcc or cross compile support in Micro$oft Visual Studio for a certain processor architecture => forget this architecture. When it become not so performant for all GNU or QT stuff, then think about, how effective will be the Java Runtime / SDK, .Net Runtime / SDK, how effective the build for script languages like perl, php, python, tcl.
I only believe in Intel, AMD, Arm, Micro$oft, Apple and the man with the Red Hat.
all other commerical Unix based systems (OS/2, AIX, HPUX, Solaris, Irix) were quiet good, but all specialized file systems like XFS, ZFS, brtfs are ported to Linux, forget processor architecture, if no sophisticated optimization in gcc.
When students in the 2nd semester in year 1992 type on the laptop during the lecture or start talking, Professor Gerd Baron always repeated very loudly that's what's all about:
We have a universe here and
it's all about of the number of arrangements in a finite set.
Professor Gerd Baron of Mathematics modified math lecture for computer scientists, where he claimed graph theory and combinatorics and weighted models (for traveling salesmen or ip routing) to understand better things we will need later (like equal costs => multipath).
plain text ⟶ 3DES PBox → AES → 2blowfish ⟶ cipher text
cipher text ⟶ 2blowfish → AES → 3DES SBox ⟶ plain text
plain text ⟶ AES ⟶ 2blowfish ⟶ 3DES PBox (scrambled) ⟶ cipher text
cipher text ⟶ 3DES SBox(scrambled) → 2blowfish → AES ⟶ plain text
you also can remix it per good random numbers like
3DES = 0x1
AES = 0x2
2Fish = 0x4
Serpent = 0x8
So 0xBC for encryption would mean 0xCB for decryption
plain ⟶ (3DES→AES→Serpent) ⟶ (2Fish→Serpent) ⟶ encrypted
encrypted ⟶ (Serpent→2Fish) ⟶ (Serpent→AES→3DES) ⟶ plain
with 2 bytes strong keys (negoatiated randomized at handshake) you're quiet secure.
I found a simple matrix symmetric encryption algorithm, that works similiar to 3DES,
with NxN Matrix trans, after asking that question here on math.stackexchange.com/questions/4915786/
R3 ➝ R3: v(3) x M(3,3) = v(3) ⎡ 1 ⎤ ⎡ 0 1 0 ⎤ ⎡ 2 ⎤ ⎢ 2 ⎥ x ⎢ 0 0 1 ⎥ = ⎢ 3 ⎥ ⎣ 3 ⎦ ⎣ 1 0 0 ⎦ ⎣ 1 ⎦ The inverse matrix for reverse symmetric encryption would be: ⎡ 2 ⎤ ⎡ 0 0 1 ⎤ ⎡ 1 ⎤ ⎢ 3 ⎥ x ⎢ 1 0 0 ⎥ = ⎢ 2 ⎥ ⎣ 1 ⎦ ⎣ 0 1 0 ⎦ ⎣ 3 ⎦
This is a very quick and walk through documentation, how to enable ipv6 addresses and ipv6 networking in AWS (Amazon Web Services) E2C instances.
In this section, we check if VPC, Subnets, Routing Tables and Network Interfaces are ready for ipv6.
It's a walkthroigh in form of (examine, check, enable ipv6 <= if not already enabled).
system library:BIO_connect:Connection refused:../crypto/bio/bio_sock2.con executing
openssl s_client -starttls smtp -connect mail.area23.at:587when testing sendmail smtp tls with an Let's Encrypt SSL certificate.
![strace openssl s_client -starttls smtp -connect [mailserver] [port]](https://blogger.googleusercontent.com/img/a/AVvXsEjTMio99QvTR7KVsaziVCR6fdBe7iA_7-NgdGxGkw0C7ikR8DqMUMx4eC0pCF-QHXUNQhkyjQhKK4yAWhRy9M1-698G8a1EmRDi5AdrUCfaekQyadu3GC71szP5YWQ35t7XDbKhEf9M0T6OcVneV8ml-rOi102n2ljk8kRNrhozOc5Mx5QyKA3t_2cGg3hU=w640-h336 "strace openssl s_client -starttls smtp")
#!/bin/sh
# generates uft-8 symbol html reference
outtext=utf8_pre_sym2000.html
modHex=256
modFF=255
modZero=0
shx=1024
printf "<html>\n<head><title>utf-8 symbol></title></head>\n<body>\n\t<h1>UTF-8 Symbols</h1>\n\t<div><span>\n" > $outtext
while [ $shx -lt 16384 ] ; do
modZero=$(echo "$shx % $modHex" | bc)
if [ $modZero -eq 0 ] ; then
printf "\n<h2>hex x%x ~ dec %d</h2>\n" $shx $shx >> $outtext
printf "\n<pre>symbol\thex x%x \tdecimal %d \t.\n" $shx $shx >> $outtext
fi
printf "&#x%x;\t&#x%x;\t&#%d;\t.\n" $shx $shx $shx >> $outtext
modFF=$(echo "$shx % $modHex" | bc)
if [ $modFF -eq 255 ] ; then
printf "</pre>\n" >> $outtext
fi
shx=$(echo "$shx + 1" | bc);
done
printf "\n\t<hr />\n\t</span></div></body></html>\n" >> $outtext
