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Old 08-28-2018, 04:33 PM   #1
PB0_corse66
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Default Dryad help :)

Hi

Not sure to understand the Dryad part..

From the doc :

B) ENCRYPTION
The second mode is used to encrypt short numeric information. The coder arbitrarily
selects two letters at random. The first letter designates a row in the current active
page. The second one is used similarly to the authentication mode, except that the
letter immediately to the right is selected. This selected letter is called the "SET
LETTER.”

Example:
Challenging station: Set letter Mixe Foxtrot.
Reply: Delta.

Numbers are enciphered one digit at a time. A ciphertext letter is chosen from the
selected row (the row designated by the SET LETTER) in the column under the plain
text digit. If the digit occurs more than once in the number, the coder is instructed to
choose a different letter in the same column. All the digits in a single plaintext
number are encoded from the same row.

Example (for Set Letter Mike Foxtrot):
Challenging station: Set number Golf Mike Sierra Tango Hotel
Deciphered number: 2 4 6 6 2



This is here I don't get it

So as far I've understood the first part, we select D as the selected Letter.
But if I look at the D row the :
Set number Golf Mike Sierra Tango Hotel

Rather deciphered into : 7 0 3 2 8


2 4 6 6 2 come directly from the first row (without any selected letter) ...

Not sure how it works
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Old 09-14-2018, 07:11 PM   #2
baltic_dragon
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Hey!

Sorry for my late reply, I've been away for some time.

So: the first part indeed is easier, Mike is the letter in the vertical column (so first horizontal letters would be CLUR). Then you look for letter F in that row (for Foxtrot). It is in the MN column, and says FD. You choose the letter immediately next to Foxtrot, so you have Delta.

Now the second part. If you are told Set Letter Mike Foxtrot for numbers, you do the same as above, but then use the first row with numbers directly BELOW the chosen Set Letter row. So in this case you will use the row between R and S. You read the letters from that red row, so you will get:
Golf = 2
Mike = 4
Sierra = 6
Tango = 6 (same field as Sierra)
Hotel = 2

Hope this helps!
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Old 10-09-2018, 11:01 AM   #3
PB0_corse66
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Hi


Been away for a while as well

Thanks for the answer but as being a little bit stubborn ^^ I'm going to raise 2 points which are puzzling me..


Quote:
If you are told Set Letter Mike Foxtrot for numbers, you do the same as above, but then use the first row with numbers directly BELOW the chosen Set Letter row. So in this case you will use the row between R and S.

I'm told to set letter Mike Foxtrot, and answer being Delta, should not I choose the row BELOW line D so between F and G?


Which leads me to my second point :
I'm looking at the Dryad documentation and we have 4 lines with digit :
Above A (red), below F (black?), below L (red), below R (red).


I compare them and except for a slight version on the line below R on the digit 3 and 7 (which may be a typo), they are exactly the same...!!


Which seems a little bit odd to me to do some encoding / decoding if ABC always = 0 and DEF = 1, etc..


Is the documentation correct ?


Thanks again for the great campaign!
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Old 10-10-2018, 12:40 PM   #4
PB0_corse66
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I'll try to make my point clearer


What are we using a complex method if all conversion between letters and digits are the same (and pretty obvious) ?
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Old 10-10-2018, 01:43 PM   #5
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I'll get back to you ASAP I don't think it is that obvious - but I'll try to explain better as soon as I have a moment!
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Old 10-10-2018, 04:09 PM   #6
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OK, I see your point now regarding the SET LETTER. I could have made the instructions clearer as it really sounds confusing now.

As for the decipher rows for numbers, I used the real life DRYAD example and for some reason it looks like this for this particular sheet. Perhaps by chance. Probably it wouldn't matter anyway, as the sheets would be changed quite often.

I'll see how I can make the instructions clearer & thanks for looking deeper into this.
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Old 10-12-2018, 08:27 AM   #7
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Thanks a lot for your answer and for the superb campaign


I'm going to try mission 11 this week end :p Damn choppers
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Old 10-12-2018, 08:29 AM   #8
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I think it is the toughest one in the campaign. A few pointers in this thread. Let me know how it went!
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Old 10-19-2018, 02:09 PM   #9
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Hey guys, I think there may be some conflicting information here? Or at least, I am a little confused?


Re the Dryad cypher;


"Numbers are enciphered one digit at a time. A ciphertext letter is chosen from the


selected row (the row designated by the SET LETTER) in the column under the plain


text digit. If the digit occurs more than once in the number, the coder is instructed to


choose a different letter in the same column. All the digits in a single plaintext


number are encoded from the same row."


I read that to mean, using the example in the instructions, the set letter Mike + Foxtrot is Delta. Therefore the D, Delta row depicts the number Golf, Mike, Sierra, Tango, Hotel as; G=7, M=0, S=3, T=2, H=8. Not 2, 4, 6, 6, 2, as on the instruction card. That depicts what's on the top most line in red text. GHJ=2, MN=4, ST=6, ST=6, GHJ=2. Hence, 2, 4, 6, 6, 2. This is not how I understand the Dryad works, or the "Set Letter" cypher is meaningless, since we are always using the very top red letter row and ignoring the cyphers G to L, M to R and S to X.


If that's how we are to interpret the Dryad then its different from how I understand it.


Let me use the missions examples;


In mission 12, there are two Set Letter cyphers given, namely Set Letter RU and Set Letter GC.


Set Letter RU cypher is N. Set Letter cypher GC is W.


Given the cypher N for the first set of coordinates, then we read as follows from the N row;
K=5, I=7, G=7, U=0, S=8, W=3 H=1. Thus 5770831.


Given the cypher W for the second set of coordinates, then we read the following from the W row;
D=2, E=2, S=7, F=5, T=8, M=7, W=1. Thus 2275871.

These are the correct Dryad cypher numbers. But they are not Lat/long for our DCS map and incorrect for INS entry.

If we use just the top row of red letters, (cyphers A to F) then the above codes become;

K=3, I=3, G=2, U=7,S=6,W=8,H=2. Thus 3327682.
D=1, E=1, S=6, F=1, T=6, M=4,W=8. Thus 1161648. These are closer to the Bullseye coordinates given as 242 for 24?



Hope that clarifies things. For this mission if you just use the very top block of cyphers from A to F then the cords approximate to Max's position.


Regards


David


















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Old 10-19-2018, 03:19 PM   #10
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Yeah I think the description I used (from Wiki) is unclear, I plan to adjust the description so that there is no doubt on how to read that. Or maybe I misunderstood the whole thing when writing the script but at this stage the only option is to modify the docs and not the coordinates
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