Number Encryption Algorithm

[Inferrd]

ofcourse it is my homework , and i want idea about this encryption algorithm to do it myself

Being asked to crack encryption methods without any clues sounds like a very strange homework assignment to me. Anyway...

Your unencrypted numbers are floating point numbers. Your encrypted data consists of 5 byte values.

In .NET, the Single Data Type is one of the Data Types that is used to hold floats. It uses just 4 bytes internally.

You can use the BitConverter.GetBytes(Single) Method to examine those 4 Byte values.

The BitConverter.ToSingle(Byte(), Int32) Method goes the other way (produces a floating point number from 4 Byte values).