Roman Chutchev

Hello everybody! 

I apologize for not having written but today, I’ll start new series of article about cryptography. 

On the next lesson, tell you: How work new cryptography algorithms? I try give you any information about cryptography at nowadays.

Today I will tell you historical information about Cryptography.

1. Early cryptography

Cryptography alrgorithm (cipher): 

100-1 CE - Notable Roman ciphers such as the Caesar cipher.

It is very simple - it is just shifting an alphabet.

And reverse cipher

How it work?

The action of a Caesar cipher is to replace each plaintext letter with a different one a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of three, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext.

Example Encrypt text with a shift (key) of 3 - “TEST” in result I’ll have “WHVW”  (Try do it)

Read more: Caesar cipher (external site).

2. Medieval cryptography

Let us turn to Wikipedia for more information:

“David Kahn notes in The Codebreakers that modern cryptology originated among the Arabs, the first people to systematically document the methods of cryptanalysis”

And also, mentioned textual analysis of the Qur'an which led to the invention of the frequency-analysis technique for breaking monoalphabetic substitution ciphers, by Al-Kindi, an Arab mathematician, sometime around AD 800.

“It proved the most fundamental cryptanalytic advance until WWII.”

Also, Al-Kindi wrote a book on cryptography “Manuscript for the Deciphering Cryptographic Messages”, in which he described the first cryptanalysis techniques, including some for polyalphabetic ciphers, where gave the first descriptions on frequency analysis.

3. Modern cryptography

3.1 1845: Morse Code – Represention by code signal (United States)  

Thank You!

Hi everybody, 

I had tried use new contact type with my followers, contact using Twitter, twitter polls for selecting topic this article, but quantity people who selected first and second option equally… and I selected topic about security BlackBerry device…

Good, let’s start!

System requirements: BlackBerry® device (smartphones with BlackBerry 7.1 OS or earlier), BlackBerry ID and laptop/PC The level of required skills: basic knowledge of the operating system (BB and Windows/MacOS/Linux/etc where you open site)

I want tell about function and application for security your BlackBerry device, we will use only oficial BlackBerry app and BlackBerry official site…

Download app, follow link: BlackBerry Protect

Open app in your phone, please read and agree from software license and press continue button

Login in your account, and select backup options, select back up frequency

And select use this function or no: access to your phone location for app (can help you find your lost or stolen device) and click “Next”

Press button “Add device” for adding your BlackBerry device as new device in your account.

After finishing setup you can press first button and start backup selected data. 

If you complete all action correct you can login on the site and use protect function when your phone lost or stolen: Blackberry.com/bbid/login/

This security function available for all BlackBerry device users. Secure your data! 

Hello everybody! Follow official CryptoSecurity Twitter profile.

Hi everyone! Today I’m publishing new article about primary data security in Windows Phone (WP) device…

System requirements: WP device and Microsoft account.

The level of required skills: basic knowledge of the operating system Windows Phone (more protected OS) and understanding of the principals work Microsoft account.

If you have device working on OS WP you can protect your device and protect your data.

At device operating on the operation system Windows Phone have reliable architecture and operating systems have opportunities for users data protection.

First what you can do - setup password for access protection to the device. 

Ok,  let’s start!

     1. Go to “Settings”

     2. And “Lock screen”

     3. Change switch “Password” to position “ON”.

     4. Set your password and confirm your password for locking device.

     And after completion steps you can see it:

 Next step what you can do - it protection against accidental purchases and protection of purchases by NFC.

This feature is named in Windows Phone “PIN-code wallet”

And maybe It help you save your money!

At first, I review option that you don’t use wallet earlier and want to protect new wallet.

     1.  Go to “Settings” and open “Wallet”

     2. Press “Get Started” button

     3. You see request access for your location, I recommend press “Cancel”.

Attention please! I recommend press “Cancel” to disallow this request and continue using your Windows Phone device more anonymity. After that Windows Phone Wallet can’t track your location and don’t send information about your experience use services but e.g. Microsoft can’t offer you tickets and phone don’t send your data to Microsoft and its partners. 

But you can press “Allow” and let Microsoft and its partners can getting data and info about your location.

     4. You see main app screen, press on three dots in bottom part of the screen

     5. And you will see item “Settings+PIN”

      6. You see main settings app page, where are you should change switch “Wallet PIN” to position “ON”

     7. Set up and confirm your PIN and press “Done”

     8. Check mark in item “Use Wallet PIN to protect music, app, and in-app purchases”

   And after completion steps you see it:

This is the first article about security your Windows Phone device and protection your anonymity, in the next article I tell you about others features and program for protecting your data and anonymity.

Hi followers! Today I decided write mini article (unscheduled article, not part of the series of articles about encrypting the data means embedded in the operating system) and I think you will be interested to know my opinion on the TechCrunch in San Francisco 2015. 

Article about confidentiality in Telegram

And new video: Pavel Durov with Mike Butcher on TechCrunch in San Francisco 2015.

Pavel had talked about his app - Telegram. Mike asked him about bad Messenger application, and the reasons why WhatsApp is sucks for him and his team.

I think it is true! Telegram completely good messenger, availability for all people (cross-platform messenger) it is plus and u can use encrypting and this messenger more privacy compared to many others apps.

For example in my real life I use Telegram almost year, using for my working and home chats and other communication and I don’t have a problems with Telegram and obviously I will be advise for you use encrypt in the app for more confidentiality.

Hello everybody! Excuse me took so long was no new articles, and the reason for this was my busyness (work). However, let us, at this time i want to consider question the protection of data on the smartphone by IOS 8 (and earlier versions from 4).

System requirements: Iphone and ITunes account. The level of required skills: basic knowledge of the operating system IOS 

I think it should be said in advance that the means of encrypting data is more reliable in the new version of the operating system IOS (8.0) so that Apple no longer have access to the the data encryption key 

Apple oficial information: 

For all devices running iOS 8.0 and later versions, Apple will not perform iOS data extractions as data extraction tools are no longer effective.  The files to be extracted are protected by an encryption key that is tied to the user’s passcode, which Apple does not possess.

(which means that there is no access to user data) but it isn’t fully protected data but more reliable compared old OS, and encryption the devices Apple one of the best compared to all mobile platforms.

The purpose of this article to talk about data protection in the IOS on IPhone.

Attention! This tool provides a high degree of protection only on the devices if not used Jailbreak

Let’s begin to protect your data! 

Note! iOS supports a four-digit password and alphanumeric passwords arbitrary length.

And should be noted that the than more reliable the user’s password, the more secure the encryption key.

One of the major security features is the ability automatically erase data from the device after (for example) 10 attempts (you can set count attempts) to enter an incorrect password.

For IOS from version 4 to version 7 (but not including IOS 7): First, go to “Settings” And go to item “General” And you should open item “Password protection”

And set PIN code for unblocking your phone.

You can setup automatic erase data from device (item “Data erase”)  which helps protect the data on your device

Attention! You must enter PIN every starting and unlocking your IPhone.

For IOS version 7.1 and higer:

First, go to “Settings” And go to item “General” And you should open item “Password protection” and I want give you advice: turn off item “Simple password” and setup reliable password “alphanumeric password“, obviously you can setup automatic erase data from device.

Hello everyone, and this a new article from the series “Data protection built-in the systems tool” Today we look at the built-in Linux Ubuntu disk encryption tool.

Disclaimer: The level of required skills: confident use of the PC, the ability to install the OS family Linux.

Attention! disk encryption will be performed when installing the operating system, which means that you will need to boot from a system image Linux Ubuntu (I used a version 15.04) and execute these actions in the installed the operating system is not possible.

Note: data encryption in is already installed OS will be discussed in the next article, now let’s start:

1. When installing the system, in the section “Installation type” select (if you have more than one mode of installation) “Erase disc and instal Ubuntu” (so you can select the “Something else” mode and manually specify the partitions and select the disc encryption) install the two (2) check mark mode: “Encryppt the new Ubuntu insallation for security” and “Use LVM with the new Ubuntu installation” and click “Install Now”

2. Next, in the section “Choose a security key”, enter your secret key, and confirm it.

Attention! Use only strong passwords, passwords similar to the “QWERTY” “12345” and “QWERTY12345” are not reliable!

Note: I also recommend: set the mark in point “Overwrite empty disk space” - this will provide more security for your computer by overwriting the free disk space … Click “Install Now”

3. Next you will get a warning on the amendments and that these hard disk partitions will be formatted, and will use these file systems, read carefully and click “Continue”

Note: On the following screens set up your time zone and keyboard settings.

4. Present yourself a system, enter your name, your computer name and user name, also set a password (it will be required to enter it each time you log in)

Attention!: Use only strong passwords, passwords similar to the “QWERTY” “12345” and “QWERTY12345” are not reliable!!

And a checkmark the item “Encrypt my home folder”, click continue.

Note: If you use your home directory encryption can be problems with using “Hibernate”, but there is a fix for this problem. (https://help.ubuntu.com/community/EnableHibernateWithEncryptedSwap)

5. Wait for the completing installation. When the system reports that the system has been installed and prompts you to restart your computer, click “Restart now”

6. Now when you turn on you will be asked “Security key” which specified earlier, after entering you will see the message “Cryptsetup: sda5_crypt set up successfully” and more time will be required “passcode” repeat your “Security Key” press “Enter”

7. After loading the login with your username and password (which you specified in step 4) and learn notice which will shown to you by the system.

Hello everyone! Finally, the new article … this time as I promised, we will consider an important means of protecting confidential information integrated into the operating system Mac OS X 10.9.5 (this algorithm is also suitable for other versions of the operating system). System requirements: the device with the operating system Mac OS, Supports disk array (encryption is not compatible with RAID-arrays) and an admin account. The level of required skills: basic knowledge of the operating system Mac OS X. For a start it is worth noting that the information will be encrypted using the built-in tools called “FileVault”. This utility allows ensure the protection your data, but does not guarantee total safety … WARNING: In case you forget defined password and lose a recovery key, you will not be able to restore the encrypted data and get access to your account! Let’s begin to protect your data! 1. You need to choose the Apple menu and then the menu item “System Preferences” 2. Next you will see a list of all the settings in which to open the "Security & Privacy” 3. And click “FileVault” 4. Click on the icon "lock” to unlock the encryption option

Attention! For this operation is required to enter the administrator name and password.

5. After pressing the “Unlock” button “Turn the FileVault” will be activated and you can press it. Then you will see your recovery key that can be used in case you forget the password…

Copy the recovery key and store it in a safe place, then click Continue. 6. Click “Restart” (Restart you Mac device) and it start process encrypting…

So, this is the second article in a series of articles “information security” resources built into popular operating systems. (Disclaimer) Level of required skills: good knowledge of the OS. System requirements: OS Android 4.3 and above, connecting to charger (maybe not require)

Attention, warning! Data encryption on devices running of Android - a one-way process - it means that to disable encryption, when it becomes you “don’t need” impossible, you’ll have to reset your device to factory settings and impossible to interrupt the process of encryption since - it can lead to loss of data, or even no working capacity of system Android. If you decide to encrypt your data, then you need to go to settings further in the section “Security” (on some devices company HTC encryption is located in the “memory”) and then you’ll see the option “Encryption” or “encryption of data”. After selecting this menu item, you’ll have a description of the function and a button “encrypt” below (note you need to set a PIN code or a password to protect the device, and some firmware the may have additional requirements that are required to successfully complete the process of data encryption on your device, my device is required connect the charger (despite the almost full charge)). Once you completed all the requirements, pressed the “encrypt” and introduced into the confirmation «PIN» or «Password», the device will ask you again: «Encrypt?» Pressing «Encrypt phone» will start a process that will last (depending on memory capacity phone, and speed of the device) of several minutes to several hours… (the device will be rebooted several times during encryption - this is normal) After the process of of data encryption your device turns on and on the screen displayed only the password field and the ability to perform “emergency call”, if you enter the correct password, your device is will boot, and will operate as usual. Attention: after the encryption disable of PIN code or password is impossible!

(Disclaimer) The level of required skills: Basic knowledge of the OS. System Requirements: OS Windows 7 and higher (which includes component #Bitlocker). So, I’ll start with a series of articles on data protection built into the system funds, this is the first article for a blog about information security. To start talk about information security should, in my opinion, from standard and very simple embedded into the system encryption tools. Today let us analyze data encryption in Windows (and then MacOS and OS Android, which also has its own system of data encryption). In OS Windows integrated component Bitlocker encryption that allows you to encrypt removable media (Bitlocker to Go), as well as encrypt data drives (hard disk partitions), also this component is allows you to encrypt the system partition (the disk partition where you installed OS). Note: To encrypt a system partition, you must have the hardware encryption module TPM, in the absence thereof encrypt a system partition will fail. I produce all the steps in OS Windows 10 Technical Preview, on the company’s ASUS laptop has built-in hardware data encryption (TPM). So, we proceed directly to our disk data encryption (in this example, I’ll encrypt non-system partition with a label «L») for that to begin encryption you need: 1. Open the “Control Panel”. 2. Then select “Disk Encryption Bitlocker». 3. Next, you need to select the drive that you want encrypt (in my case - drive G). 4. After you select the drive you need to choose which method you use to protect - a password and / or smart card, and set the password. Note: you must use a secure password, you can check the reliability of the password using the service “Kaspersky Lab”. 5. After you set the password, you will be prompted to save or print the recovery key file with a name like "recovery key BitLocker 0 *** 9 * 8 * FC ** 0-4 ** F-8 ** 2 D * 95 ** C ** 7 * 0.txt». Warning: Keep the key file recovery in a safe place, as in the case of a access to the file unknown people , he will have access to the encrypted disk. 6. After you save the file key, select encrypt type (encrypt the entire disk space or just a used disk space) 7. Click button "Start encrypting”. Disk encryption will begin, at this time, you can use the device. After the end of encryption you get a encrypted disk. As a result, we have encrypted disk using a standard component of the system, which can provide is not bad data protection and information security, but do not complete protection against hacking and data theft.