File and Folder Encryption

1. What is Encryption?

In cryptography, encryption is the process of encoding a message or information in such a way that only authorized parties can access it. Encryption does not of itself prevent interference, but denies the intelligible content to a would-be interceptor. In an encryption scheme, the intended information or message, referred to as plaintext, is encrypted using an encryption algorithm, generating cipher text that can only be read if decrypted. For technical reasons, an encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. It is in principle possible to decrypt the message without possessing the key, but, for a well-designed encryption scheme, considerable computational resources and skills are required. An authorized recipient can easily decrypt the message with the key provided by the originator to recipients but not to unauthorized users.

Encryption Tools:

Microsoft Office

Single Files, the one you have open, can be Encrypted and protected with a Password. It is very important to remember this Password because there is no way to decrypt the file without it.

In Microsoft Word when you have a File Open and want to Encrypt it, Click on FILE and in the drop down menu select INFO.
Under Info click on PROTECT DOCUMENT.
In the drop down menu click on PROTECT WITH PASSWORD.
In the little window that opens enter a Password and click OK.
A new window will open asking to Confirm your password, enter it again and click OK.
Now just save the Document as you normally would. The next time you open this document you will be required to enter the password.

Apache Open Office

As in Word, Single Files, the one you have open, can be Encrypted and protected with a Password.

Click on FILE SAVE AS. When the SAVE AS window opens check the location as to where the file will be saved, give the File a Name and just below that place a TIC in SAVE WITH PASSWORD.

7 Zip File Manager

7 Zip is a little more complicated than Word or Open Office, but it can be used to Encrypt Multiple Files and Folders all at once and compress them into a single File

MEO Encryption software

MEO is a Free Encryption Program that will also encrypt Folders and Multiple Files

Enigma

The Enigma machines were a series of electro-mechanical rotor cipher machines developed and used in the early- to mid-twentieth century to protect commercial, diplomatic and military communication. Enigma was invented by the German engineer Arthur Scherbius at the end of World War I. Early models were used commercially from the early 1920s, and adopted by military and government services of several countries, most notably Nazi Germany before and during World War II. Several different Enigma models were produced, but the German military models, having a plug board, were the most complex. However, Japanese and Italian models were also in use.

During World War Two, British cryptologists, at Bletchley Park, decrypted a vast number of messages enciphered on Enigma. The intelligence gleaned from this source, codenamed Ultra by the British, was a substantial aid to the Allied war effort.

Enigma Machine

Sent from U-264 on 25th November 1942, this message was enciphered using their standard-equipment Enigma M4 machine.

Message key: VJNA

NCZW VUSX PNYM INHZ XMQX SFWX WLKJ AHSH NMCO CCAK UQPM KCSM HKSE INJU SBLK
IOSX CKUB HMLL XCSJ USRR DVKO HULX WCCB GVLI YXEO AHXR HKKF VDRE WEZL XOBA
FGYU JQUK GRTV UKAM EURB VEKS UHHV OYHA BCJW MAKL FKLM YFVN RIZR VVRT KOFD
ANJM OLBG FFLE OPRG TFLV RHOW OPBE KVWM UQFM PWPA RMFH AGKX IIBG

Machine Settings for Enigma M4

Reflector: Thin B
Wheel order: β II IV I
Ring positions: 01 01 01 22
Plug pairs: AT BL DF GJ HM NW OP QY RZ VX

Forced to submerge under attack, depth charges. Last enemy location 08:30 hours, sea square AJ9863, following 220 degrees, 8 knots. [Pressure] 14 millibars falling, [wind] north-north-east 4, visibility 10.

 

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