How do I encrypt the text in one application and decrypt the same text with another application with date time?

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In my web application i am creating one encryption application with datetime. And i copy that text and paste in web application and try to decrypt, it shows error because of datetime. But i want encryption and decryption with datetime. How i do that?

What I have tried:

I tried and change lot of methods. But i cannot get solutions. So please help.....

Posted 15-Jun-16 19:37pm

Member 10556393

Updated 15-Jun-16 19:54pm

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Sergey Alexandrovich Kryukov 16-Jun-16 1:43am

You need to get familiar with the basics of cryptography. Public-key or symmetric encryption? How your key distribution should look like? What's the purpose? Who should get access to what and who should be denied access?
What does it mean, nt encryption and decryption with datetime? What error?
—SA

CPallini 16-Jun-16 2:26am

Using the current datetime as encryption key is definitely a bad move.

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OriginalGriff · Accepted Answer · 2016-06-15T19:54:00

Without seeing your code, and exactly what you are doing with it, we can't tell you "do this, it'll fix it". But...you say you are "using datetime" to encrypt and decrypt - that's possibly not a good start, as the DateTime class is precise to the Tick - which may be one 10,000,000th of a second (depends on the system it's running on, it may be 0.034 of a second in some)
So using it directly as an encryption key may be a very bad move, as it's very unlikely that you will get exactly the same value to decrypt it with - which means the decryption will fail. And there is also the problem that I've never seen two computers with exactly the same time! On a web application there is even worse stuff happening as the two ends of the web link won't receive messages at the same speed - the internet is not an "instant transmission" system, and two successive messages an take wildly differing times to arrive. If you use the string version as a key, the problem may even get worse, as the default DateTime.ToString will not necessarily give you the same string, as it depends on the user preferences. And then there is time zones...
Any slight difference in the key used for encryption and decryption will give you a problem and cause your decryption to fail, so you need to think long and hard about exactly what DateTime you want to use - you can't even slightly depend on it being the same value at two ends of a web link!