Mission begins with the following introduction:

An encryption system has been set up, which uses an unknown algorithm to change the text given. Requirements: Persistence, some general cryptography knowledge.

Here is string I got for mission:

8g6f;k>m

Now we have to figure out encryption algorithm. So let’s begin checking encryption. When I enter empty string I get “ so I decided to enter aaa and then I obtained abc. This got me on right track. So I tried to enter 111 and I obtained 123 this is enough to figure that algorithm works in following way using ASCII table to increase character for the position it is on.

Let me explain, if a is on second place we get b if a is on third position we get c and so on. The same is with numbers.

So let’s decrypt string above:

8f4c7f8f

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