TrueCrypt is a Free open-source disk encryption software for Windows 7/Vista/XP, Mac OS X, and Linux.
On-the-fly encryption means that data is automatically encrypted or decrypted right before it is loaded or saved, without any user intervention. No data stored on an encrypted volume can be read (decrypted) without using the correct password/keyfile(s) or correct encryption keys.
Entire file system is encrypted (e.g., file names, folder names, contents of every file, free space, meta data, etc). Files can be copied to and from a mounted TrueCrypt volume just like they are copied to/from any normal disk (for example, by simple drag-and-drop operations).
Files are automatically being decrypted on the fly (in memory/RAM) while they are being read or copied from an encrypted TrueCrypt volume.
Similarly, files that are being written or copied to the TrueCrypt volume are automatically being encrypted on the fly (right before they are written to the disk) in RAM. Note that this does not mean that the whole file that is to be encrypted/decrypted must be stored in RAM before it can be encrypted/decrypted.
There are no extra memory (RAM) requirements for TrueCrypt.
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{ 19 comments… read them below or add one }
I read about encryption and decryption in ma academics. And I am glad that this is really a useful post.
I’m not really very familiar with encryption.. It’s nice that ravi posted about this topic here
Encryption is the process of transforming information using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key.
As simple as that
Thanks for that Vishal
You are really good with tech matters 
So now I can easily protect my data from intruders
ya dude i agree with u ..
This is especially needed to protect your files which shows your financial transactions, passwords, plus some stuff on personal identification
Awesome..Download size is only 3.2MB for windows
Will give a try to this software now
Yeah.. it’s good that the download size isn’t that big as compared to most security-related comp applications
I always see the download size of any application before downloading..If I got any alternative with the less size then I download less size app only
That’s good…Wise use of disk space
really nice post dude.. thanks for sharing
not just nice… it’s very informative as well
Me too downloading it now.. hope it works good in windows 7
Yeah, it will work good on win 7
It’s nice that this software is working on all of the latest and popular OS
This is a very good program
I’ll have all my files on my flash drive encrypted. Thanks for sharing 
Hmmm Even I like dis type of security features
I think everyone wants to have secure files and encryption softwares do just that