The password you must type is:
FELINE
Why? Start by noticing that the inscription is written using:
The Elder Futhark runic alphabet.
Translating, we get:
CSISJTNEVTNEERHTNNET
What does this mean?
Well, nothing as it is. But let's reverse it to get:
TENNTHREENTVENTJSISC
Splitting this string into smaller parts, we can form something resembling words:
TEN N THREE N TVENTJ-SISC
And when you consider that the Elder Futhark does not have direct equivalents for some modern-day letters, this appears to be an attempt to spell out (replacing unavailable letters with pseudo-phonetics):
TEN AND THREE AND TWENTY-SIX
At first glance this seems to suggest that we should type:
10 3 26
into the keyboard. However, this means very little by itself (and converting into A1Z26 yields the pretty unfruitful-looking 'JCZ'); plus it makes no use of the cheese image as things stand. So how can we find a word which better ties together these numbers and the picture? Start by noting the following:
1. The image is of Cheshire cheese, specifically (taken from the Wikipedia page).
2. If we look up symbols in the Periodic Table for elements whose atomic numbers match those that we have found (a fairly common way to convert numbers to letters in puzzles), we get Ne-Li-Fe (Neon, Lithium and Iron).
What links these two?
Well, perhaps the most common association with 'Cheshire' (aside from the English county) is the Cheshire Cat - a character from Alice's Adventures in Wonderland by Lewis Carroll. This is a nudge for us to notice that if we reverse the order of the chemical symbols (in exactly the same way as we did when reading the runes) we obtain the word Fe-Li-Ne - a word relating to cats... This word - the link between the numbers and the hint image - is thus our password!
