Coding School

Problem

You want to generate a vertical image, with text over the top.

Solution

Here is some code I wrote, which is used extensively on my sites:

Example

Reference

Give it a blast on this site, like this: http://coding-school.com/common/label-up.php?label=your+text+here

Automatically calculates size required. You can also add font=# – where # is 1 to 5, like this:

http://coding-school.com/common/label-up.php?label=your+text+here&font=3

I’ve now created an online tool, using this code

Problem

Don’t know about you, but I’m generally quite lazy. Why roll the mouse and click the screen,
when with a quick control c I can copy some text. 🙂

Solution

Learn 10 simple short cuts, which can save you hours.

Example

1.

Copy some text – select it then control c
Now it is in the clipboard.

2.

Click where you want to paste it and control v to paste it. 😉

You can also right click with your mouse to cut and paste.

3.

Minimise all windows, by holding down the windows key and press m

4.

Kick off explorer, by holding down windows key and press e

5.

Do a find by holding down windows key and press f

6.

Switch between windows by holding down alt and pressing tab

7.

Reverse tab through a HTML form, by holding down the shift key.

8.

Open a web link in a new window, by holding down shift and clicking it

9.

To type in a new web address, hold down alt and press d

10.

Save a document with control s, print it with control p, undo a change with control z – sorry got carry away. 🙂

Reference

Problem

Solution

Example

Reference

Symmetric Algo – one key to encrypt and decrypt.

Asymmetric Algo – separate key to encrypt and decrypt.

Stream ciphers – encrypt each bit in sequence.

Block ciphers – encrypt specific blocks of bits.

Hash/Message Digests – one way ciphers, create fingerprints of data.

Problem

Want to know the encryption short or long names.

Solution

DES – Digital Encryption Standard. Symmetric block encryption algorithm

3DES – Triple DES. Symmetric block algo – uses DES three times.

RC4 – Rivest Cipher #4. Symmetric algo uses stream encryption.

RSA – Rivest, Shamir, Adelman. Symmetric block algo.

IDEA – International Data Encryption Algo, symmetric block algo – used by PGP.

AES – Advanced Encryption Standard (Rijndael) – symmetric block algo.

Example

Demo of des3, rc4 and aes256 – using abc123 as password and thecatsatonthemat

$ echo thecatsatonthemat |  openssl enc -des3 -a -e -k abc123U2FsdGVkX1/I03dG1d8bGYycfojc4x/S5uU1YIf1QRPRw+9AgKhVCw==$ echo "U2FsdGVkX1/I03dG1d8bGYycfojc4x/S5uU1YIf1QRPRw+9AgKhVCw==" | openssl enc -des3 -a -d -k abc123thecatsatonthemat$ echo thecatsatonthemat |  openssl enc -rc4 -a -e -k abc123U2FsdGVkX1+NuZk94r5kJdFfw8gsjlO9ZV7BDXLwm+3PNg==$ echo "U2FsdGVkX1+NuZk94r5kJdFfw8gsjlO9ZV7BDXLwm+3PNg==" |  openssl enc -rc4 -a -d -k abc123thecatsatonthemat$ echo thecatsatonthemat |  openssl enc -aes256 -a -e -k abc123U2FsdGVkX1/bGQ0rtpGi6CjkeAyyEgQjnxkSWBQ6q7XLgAApdWHA5BdEuK24r/NY$ echo "U2FsdGVkX1/bGQ0rtpGi6CjkeAyyEgQjnxkSWBQ6q7XLgAApdWHA5BdEuK24r/NY" |  openssl enc -aes256 -a -d -k abc123thecatsatonthemat

Reference

Wiki links

• DES
• 3DES
• RC4
• RSA
• IDEA
• AES