Excel encryption strength - how to decide
How safe is encrypted Excel file?
Microsoft has made the level of protection strong and if you lose the password, the file will be useless. The encryption used in Excel 97 to 2003 (. xls) for legacy files are RC4 as compared to more secure AES in Open XML files used after 2007 for example (.29 mei 2020
Today let's see how we can lock and unlock certain areas in an Excel spreadsheet. So we're going to look at the basics, but the case we're looking at today has a twist. This was a question from one of my student, Anya, who asked, 'I want to leave yellow cells unprotected.' Is there any way I can do this without a VBA macro? 'That way I can go from an unprotected yellow cell to the next with the Tab key and that would save me a lot of time entering data.
Can we do this without VBA? (soft hip hop music) First off, the basics of protecting and unprotecting your worksheet do so in the Review tab. Under Protection here you can protect the entire sheet by clicking on it. You will probably want to give this a password and you will need to confirm that password.
Everything is completely protected so if you try to type anywhere in this sheet you will get this popup which is protected and the only way for the user to unprotect is if they know the password you have the option to unprotect some of the cells and to keep the others protected. We can do this in different ways. One method is to use Allow Editing Areas.
This now gives you some extra options so that you can set different passwords for different areas, but in case we just want a simple solution we just need to select the cells that we don't want to be protected, right click, format cells or use the keyboard shortcut Ctrl + One. Under Protection here, you need to uncheck the box next to Blocked. Once you do, nothing happens until you protect the worksheet, so nothing is protected at this point.
I can type anywhere. So I can enter here and I can enter here The moment you protect the sheet, I now click Protect. This time I just don't give it a password and click OK.
So if I try to type something here it is still protected, I can't type, but I should be able to type here and I can. And of course you can select different areas and uncheck this box so that once the sheet is protected, the different areas are unprotected. Let me remove the protection and just uncheck all cells.
If you get that icon there it means there are a mix of cells are protected, some cells are not. I'm just going to reset the check mark to go back to the original default state. Let us now come to the complex case.
My goal is to protect all cells here except the yellow cells. These cells are going to be my input cells, and usually when you have an Excel spreadsheet and you're entering data, let's say I type 23, I hit the tab key and that takes me to the next cell. The tab key takes me to the next cell, if I protect these gray cells and leave the yellow ones unprotected, it means that if I press the tab key in a yellow cell it jumps to the next unprotected cell which is that yellow cell and then that yellow one I want to remove the protection of all yellow cells.
The time consuming way to do this is to select all of those yellow cells so hold down the Ctrl key, select them and then remove the check mark, but that will cost me a lot of time if I do this has to do in a big area like this. The faster way to do it is this. We will highlight the area where we will enter data and we will use the search function.
So let's press Ctrl + F. Under Options here we get the opportunity to add a specific format. Choose Select Format From Cell and go to one of those yellow cells.
Now remember that when you format cells this way, it takes into account not just the color, but all of the formatting of the cell, including the number formatting that is behind it. Click Find All. It will find it all here, and I want it highlight in my table, so I'll press Ctrl + A to highlight these results, what's going to highlight them here on the sheet, and let's just close our dialog box.
Now I'm using the keyboard shortcut Ctrl + 1 to go back to Format Cells, go to Protection, remove the check mark next to Locked. Click OK. Now we're going to protect the leaf.
This time, I'm not going to give him a password, and let's test. Let's put a number here and hit Tab. Go to the next yellow cell.
Tab, Tab. This way I can enter data so much easier, so that was my approach If you can think of other methods, share them with me in the comments below, this was our Thursday fun. If you liked it, give it a thumbs up, and if you haven't subscribed to this channel and you want to improve your Excel skills, consider subscribing to Percussive Music)
Is Excel data encrypted?
Encrypt files using Microsoft Excel 2007 or newer
Microsoft Excel 2007 (or newer) encrypts information using a 'Protect' function. This function does not simply passphrase-protect a file, but it encrypts is using AES encryption. With your document open, select the File tab. Click Info and then select Protect Workbook.
Hi folks, in this article we are going to give a really basic introduction to encrypting and decrypting messages and we are going to use Excel to do so, so this is good for anyone looking to improve their Excel skills, and good for too anyone just interested in learning about encryption ok so just to see how this stuff is done in the real world it's way more complicated so don't go if you are an expert. Check out this article, this is not a article for you, okay so let's learn a lot of stuff anyway and we will be using nested functions including nestedvlookup functions. For people looking to learn about Excel this is a great example to work with advanced techniques so basically we have the alphabet in order here and we are going to decipher a message hello aencrypt it using the ciphertext technique that we have here and then we're going to decipher it and hopefully hello again okay and we'll use formulas to do all of that but before we get started let me explain what's going on, so here is the alphabet and the column of numbers is here only the first letter a is 0, the second letter B is 1 down to Zis 25, so there are 26 letters, but since we start at 0 there are 25 and that only counts all translated numeric The numeric column here is essentially based on a translation factor that the user defines, so here if we set 0, which means that the translation factor is 0, it becomes a one-to-one correspondence between the numerical Column give a and column Cright they are exactly the same column and in this way this encryption would actually result in a null encryption.
The encryption would just repeat itself, so no encryption is done so we can choose a translation factor between 0 and 25, 0 means no encryption and up to 25 that would mean Z would become a and soon, but we can choose anything in between , let's say 3, okay, now when I hit enter you see my newly translated numeric column h instead of starting at 0, now starting at 3, this is the translation factor going up to 25 and then starting again at 01 and ending at 2 Okay, so we are going to use this column and actually all three of these columns first to Inc in Creepencrypt this plain text message from hellothat we have okay here the way we do that is with a nested vlookup function ok so is equal to vlookup let's instages this we are going to do the internal vlookupfunction first if you are not familiar with welookup functions definitely check out my n article on that survived Oh almost 200,000 views on Vlookups ok I will also include a link in this article at the bottom of the description and baby so we can open it in a new tab and see before you get into this heavy lifting, okay so vlookup what do we want to look up well we want to look up the H where do we want to look it up well we want to look it up here in this table then I would normally press f4 here, but since f4 is another functionality in my screen recording software I have to do that Enter the dollar sign manually and I hope you know why I do that I close the table correctly again vLookups are new to you please watch the vlookup article I will definitely link it here okay so and then come back and if you understand vlookups, I'm sorry, but every now and then I have to cram that because people get completely lost, okay, so third argument, because if I can find the letter H. de, i want him to translate me then numeric number 10 okay comma wrong means exact match if i just hit enter here i should get the number 10 which means it found H and it gave me 10 like it should have been but i don't want 10 i want the message to be translated to another alphabet, an encrypted alphabet so i will go back i will go in front of it vlookup function and i will do another vlookup function this time enter, the lookup value is actually the number 10, so this vlookup is the veal is the lookup value in this other vlookup function that we run outside of this nest d vlookup okay if it finds and we already know what it will find if it's a chip finds 10 if it finds H we're first where we want to look for 10 well we want to look for it in this table over here that starts with the numerix column and leave me manually lock this table again because I f4 is something else for me, so if you manually enter the comma when you find the number 10, when you find this guy here, whatever produces what we already previewed show and we sell it was 10 what do you want well? I want you to give me the alphabet again so that column is 2 and then wrong again for an exact match. Close the brackets hit enter and go K now let's follow before we go any further so it looked for H first and it gave me 10 then that was the internal vlookupthen it i looked up here 10 and gave me K, so this happened, this is step 1 and then step 2 is okay, this one was in this one, okay, so this one was nested in this one, and so we get K okay, so now in motion we can just overwrite this formula, because we locked the corresponding tables without formatting and now this is our encrypted message, so hello has been encrypted to the core, okay, we want to come back now and decrypt this message in order to read it now Email systems use this a lot and everyone Types of messaging systems attempt to provide secure encryption so that people can intercept messages and properly steal information Credit Card Companies Oh Everywhere S Safety is a big deal and this area is incredibly complicated and high-level math, but our example is fun, it's a good introduction, and it's definitely edifying, okay, so let's get that ciphered message back in hello convert, hopefully here, okay, the way we do this, I actually created a table on the right and this I called the decryption table which is basically this alphabet column and translate numerically to Reverse OK for you to translate that see cop's numeric column actually the first column is here and the numerix column is the third column Okay so let's make this formula so vlookup this time we're going to look up the K and where we're going to look up we are going to have to look it up here we need to lock you this table so I can manually insert the dollar sign comma when you find the AI that you give me the second column as my result give false forexact match, so we should get the number 10 again, this time we will nest the one we just created in another vlookup and lookup value this time is the first vlookup comma in the table of fists starting with the translated numeric column, let's block this table - to give me the second column, closing brackets and we should get H and we're going to look at this, so what happened here, it looked up K over there in that column to the right found K and then it gave me ten then it took ten search for it in that column found ten and then give me H okay and this formula is a robust formula so we can drag it to the right and weshou ld hello voila we do and so were we succeed in encrypting this message first and then decrypting it back into plain text using the nested vlookup function, a translation factor of three and only these two basic tables we could do in Excel itself, so I hope this was fun, perhaps informative, and definitely one of the rare times for those of you who want to improve your Excel skills too i used a nested vlookup function but in any case i am sure that people use this very often so very useful so be sure to subscribe to my channel i have almost a hundred articles on Excel Access PowerPoint and Math Share Do comments and practice
Is Microsoft encryption secure?
How secure is the encryption? # The encryption in Microsoft Office 2016 is considered safe (AES with 256-bit key) and takes a very long time to break with today's machine resources if the password is secure enough. See the Username and Password page for more information on how to make secure passwords.
- Hey guys, Christie here from DPC Technology. Today we're going to talk about how an encrypted email is sent, what it looks like when it is sent, what it looks like to the person receiving the email, so that we can be a little more comfortable with sending encrypted emails every day. If you're new here, DPC Technology is a managed service provider providing IT managed services to small businesses throughout the southeastern United States.
On our channel, we like to make articles about product reviews, the use of technology in your company and articles like this one. So, if that's what you're into, go ahead and hit the Like and Subscribe button below. Get that out of the way.
And let's go straight to the article. (Upbeat music) So you might be thinking, why do I have to use encrypted emails and when do I need to send encrypted emails? The answer is whenever you have private information, payment information, and most importantly Patient health information such as social security, birthdays, x-rays a Make sure to use encrypted email when sending it to someone else. The way we use it today, and the way I'm going to show you, is to use Microsoft Outlook with an Azure subscription, you can't just send an encrypted email without a subscription .You must have a subscription to have all of these options that you see in my email, if you don't have a subscription click these buttons, you just won't see the options.
So if you need help setting it up, please feel free to contact us, especially if you are a Complete Care customer. We've probably already set you up with at least one account that you can send encrypted emails using. Okay folks, let's go to my computer and I'll show you how to send encrypted emails.
Okay, we'll show you how They send an encrypted email from Outlook, and in this case I send it to my Gmail account, but it would look the same if you sent it to Ya hooor any other type of non-Microsoft Outlook account. So, let's go. I'll check up new email and send it to my Gmail account.
I just say test. I just press so I go to options and encrypt. And you have four different options here.
I'll start with just encrypting. This is really all you absolutely need if you want to be HIPPA compliant, which is only encrypt.There are other options such as not forwarding.
There is the option that we have set up some rules internally that say that only confidential internal emails and only a confidential internal email view are displayed. So when we send email within our organization, you are kept confidential. But if I just send something that I want encrypted, I just click on it, encrypt.
This message is encrypted. Recipients cannot remove the encryption. And then I'll hit send here, and we'll go to our Gmail account and see how it looks on the other side.
The idea is that in Microsoft you are using a portal that you kind of have to sign into that portal on the other end so you can see the email. So it is not necessarily transmitted like a normal e-mail. It is kept on this portal and is therefore less likely to be stolen, hacked or anything like that.
So that's the point of using an encrypted email. And that's why we like to use Microsoft Office 365. It's the easiest way, especially in Outlook.
So here is the email, I'll click in here. And you will see it says Christie sent you a protected message. I click here to read the message.
It says I sent you a protected message. Please log in to see the message. You So you can either log in to your Google account again, I know you are already logged in, but this will log you into the portal part.
Or you can sign in with a one-time passcode. This time I just log into my Google account again. And there it is.
In this scenario I can copy it, I can forward it. But the email is encrypted. It can be seen on this portal for me.
You can see up here, it's no longer in my Gmail. I am signed into this portal to see this email. Let me close it and let's say try again.
Now that I'm in it, I think it just opens up again, so this time after I got in it just opens back to normal. So let's close it. Let's delete and send another one.
And this time I'll send it with Don't forward. And then at this end, let's see what it looks like. Another great way, sometimes people are worried, how do I know it was encrypted? They want to know what it looks like at the other end.
Send yourself a test Email or send one to your personal account and see what it looks like and make sure it works. But if you see these options in your Outlook it should work. Here we go.
This is what it looks like. Right back but when I open it, you will see that I can't copy it, I can't mark it, when I want to forward it it is grayed out, when I want to print it it is grayed out, so it says not forward. Recipients cannot print or copy content.
All right. So now I'm going to show you what it looks like to do the same thing, but instead of from your Outlook on your workstation, it will be from the Outlook app on the web. On your laptop, on vacation or something, and you need to send someone an encrypted email.
To be able to sign in to your Outlook, go to portal.office.com and sign in this way.
Go to your Outlook and go to Write a new message and the same thing I did before but we will go to my Gmail account. I will do a test. You will see a button up here that says 'Encrypt'.
However, if you've never looked there before, you probably never say. So there it is. I'll click encrypt.
And you will see, now it is called encrypt, this message is encrypted, recipients cannot remove the encryption, change the authorization or remove the encryption. If we click on Change Permission, you can now see that on our computer, the desktop version, we have a drop-down list with the same choices that we had in Outlook PC Confidential Load, Show Only, Do Not Forward or Encrypt. So I just click on encrypt again.
And we click send. It is being sent. And then I go back to my Gmail account.
So here we go, same message. We will click on the message. Since I'm already logged in, I am not prompted to log in.
But you can see, here it is. Encrypt, this message is encrypted. So, the same.
Also, let me show you what it does when you want to send within your organization. I click encrypt and then want to change it to make it confidential The content can be changed but not copied or printed. So we're sending it to my Gmail account, which in theory doesn't work as I'm outside of the organization.
Here it is. When I click read the message, I am now logged in and it shows that an error has occurred. We're sorry, an unknown error occurred.
Please try again later. And that's because outside of the organization it won't get through. I just get an error message.
This is to make sure you don't accidentally send anything outside of your organization. Now I'm going to tell you how to see if the email you sent is actually encrypted. When you go into your sent email inbox you will see the little lock next to it and that means it was encrypted little lock and you will also see at the top that this message is encrypted and the recipients cannot forward it.
So this is a great way to check this out. Sometimes it is also good to send one to yourself first. and make sure it comes across that way, then re-send it to whoever you are sending it to.
Alright guys. I hope you enjoyed the article. add them to the comments.
I hope you have a nice day And see you in the next article. (upbeat music)
Can Excel passwords be cracked?
Crack the workbook, worksheet and modify passwords with a macro. Open a new Excel workbook and copy the following code into a standard module within the Visual Basic Editor. Run the macro above. Select the file which contains the passwords to be removed, then click OK.
What kind of encryption is used in Excel?
Key derivation is performed using 50,000 iterations of SHA-1 (increased to 100k in SP2 ). Uses a 16-byte (128-bit) random salt. AES is the block cipher used to encrypt the document. By default, 128-bit key are used. There is a registry tweak to change this to 256-bit.
Why does Microsoft Office 97 have weak encryption?
Microsoft Office 97 apps were released with deliberately weak encryption. The artificial vulnerability existed due to US export restrictions. While native US versions of Microsoft Office could be configured to use somewhat stronger encryption, the setting was rarely enabled because of compatibility concerns.
What is encryption algorithm used in office 2016?
I want to save some important data in an encrypted Excel file, and wanted to know what the current encryption standard was in Office 2016. I was able to find the details for previous versions of office, but not for 2016. Does anyone know? https://technet.microsoft.com/en-us/library/cc179125%28v=office.16%29.aspx?f=255&MSPPError=-2147217396
How is the encryption on Microsoft Office documents?
But if someone can get a document that's locked and own it, there's nothing to stop them from trying a million passwords a second, and brute-force that document. Having said that, Microsoft has started using strong encryption on documents. The weak link will be the password.