You can use the following shell function to generate random password.
Edit ~/.bashrc file, enter:
genpasswd() {
local l=$1
[ "$l" == "" ] && l=16
tr -dc A-Za-z0-9_ < /dev/urandom | head -c ${l} | xargs
}
Save and close the file. Source ~/.bashrc again, enter:
$ source ~/.bashrc
To generate random password, enter:
$ genpasswd
To generate 8 character long random password, enter:
$ genpasswd 8
When you are behind a proxy server on your ubuntu machine you have to edit (or create) your apt.conf to define the proxy settings:
Create (or edit) an apt.conf file at /etc/apt/apt.conf
Add the following line to this file:
Acquire::http::Proxy “http://username:password@proxyhost:port/”;
If you have any special characters in your password you have to use the URL encoding syntax. For example a ! translates to %21.
The next time you use apt-get the proxy settings will be used.
This article contains tips and tricks about Visual Studio. Tips are collected during day to day work with Visual Studio.
Type Ctrl-F, in Find Options select Regular expression instead of “Wild card”
Type your regular expression; for example [.]isual studi[.]
The default behavior is greedy matching; to use non-greedy matching use the @ (instead of *) or
the # (instead of .)
Show command window Ctrl-Alt-A
Cycle through clipboard buffer Ctrl-Shift-V
Toggle display whitespace Ctrl-R, Ctrl-W
Show options for smart-tag Ctrl-.
To start a shell from visual studio open the command window (Crl-W,A). Type “Tools.Shell cmd”.
This article is about cryptography and asymmetric encryption / decyption.
Asymmetric (public / private key pair) and symmetric (one key to encrypt and decrypt).
– distribute your public key
– keep your private key secret and private 🙂
Ask people who want to send you a secret mail to encrypt it with the public key. Only you, the owner of the private key, are able to decrypt it.
Install openSSH from http://slproweb.com/products/Win32OpenSSL.html (Visual C++ 2008 Redistributables and Win32 OpenSSL v1.0.1c).
Add the installation folder to your path and adjust the environment variable OPENSSL_CONF to point to your configuration file.
Asymmetric encryption of a file:
1. Create a private key and public key pair:
> openssl genrsa -out private.pem 1024
1a. Encrypt you private key:
> openssl rsa -in private.pem -des3 -out private-enc-key.pem
2. Extract the public key from this file (the public.pem, created below, can be freely distributed):
> openssl rsa -in private.pem -out public.pem -outform PEM -pubout
3. Encrypt a file:
> openssl rsautl -encrypt -inkey public.pem -pubin -in file.txt -out file_enc.txt
4. Decrypt the file with your private key:
> openssl rsautl -decrypt -inkey private.pem -in file_enc.txt -out decrypted.txt
Retrieve information about your private key (generated with genrsa command):
> openssl rsa -in privateKey.pem -text
NOTES
Privacy Enhanced Email (PEM)
http://users.dcc.uchile.cl/~pcamacho/tutorial/crypto/openssl/openssl_intro.html
