[VicPiMakers Projects] Jim's Challenge - Output 10 (caesar cipher)
Patrick McMorris
patrick at mcmorris.ca
Sun Oct 11 23:24:00 EDT 2020
That's certainly crafty.
I considered that but again you need to make more assumptions like you're
using the same corpus of words. What if it's not an English word. What if
it's not a regular word but a name. What about words that have multiple
possible matches because multiple rotations are valid? (e.g. "FUSION" and
"LAYOUT"). Then do you output multiple possible keys?
On Sun., Oct. 11, 2020, 7:36 p.m. Mark G., <vpm at palaceofretention.ca> wrote:
> Hi Patrick et al,
>
> I decided that a simple brute force through keys 1-26 and then
> checking the output using a spell checker library could work.
>
> Here's a snippet:
>
> ...
> #include <nuspell/dictionary.hxx>
> #include <nuspell/finder.hxx>
> ...
>
> // vector for deciphered message
> std::vector<char> message;
>
> // Key (unknown) for ceaser cipher.
> int key = 0;
>
> int offset {'A'};
> int message_letter {'0'};
>
> auto dict_finder = nuspell::Finder::search_all_dirs_for_dicts();
> auto path = dict_finder.get_dictionary_path("en_US");
> auto dict = nuspell::Dictionary::load_from_path(path);
>
> // Go through all keys
> for (key = 1; key <= 26; key++) {
>
> message.clear();
> // letters contains our encrypted text
> for (const auto letter : letters) {
> message_letter = offset + (((letter - offset) - key + 26) %
> 26);
> message.emplace_back(tolower(message_letter));
> }
>
> auto word = std::string(message.data(), message.size());
>
> auto correct = dict.spell(word);
> if (correct) {
> break;
> }
> }
> print_output_and_number(output_number++);
> std::cout << "Key: " << key << std::endl;
>
> ==============
>
> What happens is that each key is tried in turn and a word is created
> out of all 6 letters. This word is then compared against a spell
> checker, and if a correct result is found, then there is a high
> likelyhood that we've found the key and we break out of the key loop.
>
> This requires no prior knowledge of the plain text, but can be
> computationally expensive.
>
>
>
>
>
>
> On 2020-10-11 3:46 p.m., Patrick McMorris wrote:
> > Ok, thanks.
> >
> > Then there are two inputs; not just the data array. Question 10 implied
> > a second input will be provided.
> >
> > On Sun., Oct. 11, 2020, 3:37 p.m. James Briante, <briantej at gmail.com
> > <mailto:briantej at gmail.com>> wrote:
> >
> > Hi Patrick,
> > Here is the last sentence of the comment I posted today at 2:31 PM
> > "The final test data will include a new string not “BIOPSY”.
> >
> > Jim
> >
> >
> >
> > On Sun, Oct 11, 2020 at 3:19 PM Patrick McMorris
> > <patrick at mcmorris.ca <mailto:patrick at mcmorris.ca>> wrote:
> >
> > Hello Jim,
> >
> > Your instructions are unclear and we're just asking you to
> > clearly address the issue.
> >
> > If you want our code to output the key used then either we
> > assume the word is the same or your next update also provides a
> > new word in addition to a new byte array.
> >
> > Which is it?
> >
> > On Sun., Oct. 11, 2020, 2:32 p.m. James Briante,
> > <briantej at gmail.com <mailto:briantej at gmail.com>> wrote:
> >
> > Craig, Patrick, Greg & Others,
> >
> > Note that the string “BIOPSY” is not part of the input data
> > but included in the description of Output#10 in order to
> > simplify things. If “BIOPSY” appears in your code, you have
> > created an *implicit input* to simplify things. The final
> > test data will include a new string not “BIOPSY”.
> >
> > Consider the implication of not having known the plaintext
> > “BIOPSY”. One solution would be to write separate code (not
> > part of the solution to Challenge1) that sequentially
> > reverses the encryption process. Why not do so and then just
> > print 6 for Output #10?
> >
> > The above method requires human intervention in order to
> > recognize meaningful words during the decryption process.
> > Why not write code to remove the human out of the loop?
> > Hopefully, that explains why the string *“BIOPSY*” was a
> > good choice for Challenge 1.
> >
> > Jim
> >
> >
> > On Sun, Oct 11, 2020 at 9:52 AM Michelle Wiboltt
> > <michellewiboltt at outlook.com
> > <mailto:michellewiboltt at outlook.com>> wrote:
> >
> > Also, instead of exclamation! ? for instance, why can’t
> > these be illustrated as musical notes so that we come to
> > learn /to understand tempo/crescendo/intent...plus,
> > “music tames the savage beast”, non? So wouldn’t we want
> > to gift “those extraterrestrials” with this type of
> > advantage, which is really our advantage in that we set
> > the tone:)
> >
> >
> ------------------------------------------------------------------------
> > *From:* Projects <projects-bounces at vicpimakers.ca
> > <mailto:projects-bounces at vicpimakers.ca>> on behalf of
> > Greg H <greg.horie at gmail.com <mailto:
> greg.horie at gmail.com>>
> > *Sent:* Sunday, October 11, 2020 9:43:32 AM
> > *To:* Talk about Raspberry Pi / embeded projects
> > <projects at vicpimakers.ca <mailto:projects at vicpimakers.ca
> >>
> > *Subject:* Re: [VicPiMakers Projects] Jim's Challenge -
> > Output 10 (caesar cipher)
> > Nice one Eileen! Solving it in Scratch sounds like a
> > challenge.
> >
> > Has anyone considered trying it in a pure functional
> > language?
> >
> > https://en.wikipedia.org/wiki/Functional_programming
> > <
> https://nam10.safelinks.protection.outlook.com/?url=https%3A%2F%2Fen.wikipedia.org%2Fwiki%2FFunctional_programming&data=02%7C01%7C%7Cbe8d0cc14e5245e5aa3808d86e04ed6a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637380314727328950&sdata=h57KpB18orFr3DZDozsMp7Wuu3TI%2BAXKneLt2kXKMHE%3D&reserved=0
> >
> >
> >
> > On Sun, 11 Oct 2020 at 09:35, Michelle Wiboltt
> > <michellewiboltt at outlook.com
> > <mailto:michellewiboltt at outlook.com>> wrote:
> >
> > Is it a question of overthinking? Me, I see it as a
> > question of “over” feeling things - on steroids, no
> > less and from here/there, building a “visual”
> > conceptual foundation of these wonderfully warm
> > feelings for all to see/feel/utilize AND understand.
> >
> > It kind of needs to contain our existing or newly
> > conceived of “absolute love language”...like an and.
> > And always conjoins so, what word, string, etc?
> > always conjoins the all of the all of us...then, we
> > mirror our movement with/by that spin around the
> > world thing, same as our world, non?
> >
> >
> ------------------------------------------------------------------------
> > *From:* Projects <projects-bounces at vicpimakers.ca
> > <mailto:projects-bounces at vicpimakers.ca>> on behalf
> > of Eileen Amirault <cody.eileen at gmail.com
> > <mailto:cody.eileen at gmail.com>>
> > *Sent:* Sunday, October 11, 2020 9:23:54 AM
> > *To:* Talk about Raspberry Pi / embeded projects
> > <projects at vicpimakers.ca
> > <mailto:projects at vicpimakers.ca>>
> > *Subject:* Re: [VicPiMakers Projects] Jim's
> > Challenge - Output 10 (caesar cipher)
> > Hey everyone,
> >
> > Just solved challenge #1 using Scratch. Hope the new
> > ‘Test’ data will work just as well. Intend on
> > showing you what I did at the end of my presentation
> > on Oct 24.
> >
> > Have a nice week,
> > Eileen
> >
> >> On Oct 11, 2020, at 9:15 AM, Michelle Wiboltt
> >> <michellewiboltt at outlook.com
> >> <mailto:michellewiboltt at outlook.com>> wrote:
> >>
> >> Ok, but there IS a watermark? thing...so, this
> >> needs to be illustrated meaning, if we’re creating
> >> a love �� language we want that to show in its
> >> entirety AND if “bad” people “break” in...aren’t
> >> they just asking to be included? wouldn’t it be a
> >> wanting but not knowing how to be a part of this
> >> fabulousity that is the (our) language of love ��
> >> So, if they “break” in doesn’t it stand to reason
> >> they were left out. Isn’t that our bad?
> >>
> >> Also, a language of love would have to be, would
> >> need to, continually fortified in order for it to
> >> remain foundation-ally strong, right white lights?
> >> And, its strength comes from our ever evolving
> >> understanding/feeling/sensing/knowing of what our
> >> hearts are truly capable of and then, illustrating
> >> this in the majesty that WILL be our code that You
> >> all create, see?
> >>
> >> Also, just a thought, what about that bit coin
> >> spin around the world tor thing...if we built our
> >> foundation on something like this wouldn’t this
> >> keep any nasty extraterrestrials at bay but
> >> wouldn’t it also, keep us ALL contained herein,
> >> safely.
> >> m
> >>
> >>
> ------------------------------------------------------------------------
> >> *From:* Projects <projects-bounces at vicpimakers.ca
> >> <mailto:projects-bounces at vicpimakers.ca>> on
> >> behalf of Patrick McMorris <patrick at mcmorris.ca
> >> <mailto:patrick at mcmorris.ca>>
> >> *Sent:* Sunday, October 11, 2020 8:34:44 AM
> >> *To:* Talk about Raspberry Pi / embeded projects
> >> <projects at vicpimakers.ca
> >> <mailto:projects at vicpimakers.ca>>
> >> *Subject:* Re: [VicPiMakers Projects] Jim's
> >> Challenge - Output 10 (caesar cipher)
> >> I agree it's not that clear.
> >>
> >> If the goal to be able to simply run the existing
> >> code on new input bytes then yes, "BIOPSY" is
> >> always the decrypted word since the byte array is
> >> the only given input. If the word changes, that
> >> hasn't been specified where that input would come
> >> from. So, either it doesn't change or the
> >> description of the second input is missing.
> >>
> >> But using a hard-coded word doesn't sound terribly
> >> interesting to code up. You could still write your
> >> key finding function to accept two strings of
> >> equal length and output the required caesar key.
> >> Then for question #10, call it with the word you
> >> extract from the input array and the hard-coded
> >> target word and write the output key. Then the
> >> problem is hard-coded but your code is more generic.
> >>
> >>
> >> Patrick
> >>
> >> On Sun., Oct. 11, 2020, 8:01 a.m. Greg H,
> >> <greg.horie at gmail.com
> >> <mailto:greg.horie at gmail.com>> wrote:
> >>
> >> For me, the confusion is that we're intended
> >> to write code to derive the cipher key value.
> >> I did this and came up with an answer, but
> >> this key is only relevant "HOUVYE" / "BIOPSY".
> >>
> >> So should I take this key and make it a
> >> constant for future inputs / encryptions?
> >> That's what I ended up doing with my final
> >> code submission.
> >>
> >> I took out the code that solved the problem
> >> because unused code seems like lint to me, but
> >> maybe I should put it back to show how I did it.
> >>
> >>
> >> On Sat, 10 Oct 2020 at 17:45, James Briante
> >> <briantej at gmail.com
> >> <mailto:briantej at gmail.com>> wrote:
> >>
> >> Hi Patrick,
> >> Yes, you can look at only the first
> >> character of the string and use it to get
> >> the key. Comparing all characters as the
> >> advantage of catching errors in
> >> encryption/decryption. The code is just as
> >> short using "compare strings" of your
> >> particular language.
> >>
> >> In C int strcmp (const char* str1, const
> >> char* str2);, in C++
> >> *int**CompareText*(*const*AnsiString *S1*,
> >> *const*AnsiString *S2*); Pascal ( Delphi)
> >> *function**CompareText*(*const**S1*:
> >> *string*; *const**S2*: *string*): Integer;
> >>
> >> Aside: The purpose of the final test data
> >> is to see if your outputs are correct when
> >> you run your code with the new data. It
> >> should work the first time with no changes
> >> in the actual code.
> >> Jim
> >>
> >> On Sat, Oct 10, 2020 at 4:46 PM George
> >> Bowden <gtbowdeng at gmail.com
> >> <mailto:gtbowdeng at gmail.com>> wrote:
> >>
> >> Hi Michelle
> >> If you are on a laptop or computer
> >> using chrome, you can hold down the
> >> CTRL key and tap the letter u . There
> >> are things further back than that but
> >> its a start. As for ink marks showing
> >> through, we try to avoid that because
> >> it usually reveals security holes that
> >> the bad people exploit.
> >>
> >> On Sat, Oct 10, 2020 at 1:23 PM
> >> Michelle Wiboltt
> >> <michellewiboltt at outlook.com
> >> <mailto:michellewiboltt at outlook.com>>
> >> wrote:
> >>
> >> Please help:)
> >> Here’s where my crazy comes in,
> >> see this image...
> >> <Image.jpeg>
> >> Ok.
> >>
> >> Now, if u could think in terms of
> >> front back / embroidery and its
> >> front back...
> >> So, above is a code interface? But
> >> where is the back front and back?
> >> Front would be the website, right?
> >> So, when I do online shopping,
> >> that’s the front. Where is the
> >> back view of the front of the
> >> website?
> >>
> >> Another example, when writing in
> >> ink it can show through the
> >> backside when held to the light,
> >> kind of thing is what I’m trying
> >> to understand? Where’s that on the
> >> internet?
> >>
> >> Thx
> >> m
> >>
> >> Michelle Wiboltt
> >> www.elb1b69.net
> >> <
> https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.elb1b69.net%2F&data=02%7C01%7C%7Cbe8d0cc14e5245e5aa3808d86e04ed6a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637380314727328950&sdata=LwqWQoRGJqX8ioMprkuE9VwBOb3JfvgsIpAG0kxAYFs%3D&reserved=0
> >
> >> 604-612-2505
> >>
> >>
> ------------------------------------------------------------------------
> >> *From:* Projects
> >> <projects-bounces at vicpimakers.ca
> >> <mailto:
> projects-bounces at vicpimakers.ca>>
> >> on behalf of Greg H
> >> <greg.horie at gmail.com
> >> <mailto:greg.horie at gmail.com>>
> >> *Sent:* Saturday, October 10, 2020
> >> 8:56:49 AM
> >> *To:* projects at vicpimakers.ca
> >> <mailto:projects at vicpimakers.ca>
> >> <projects at vicpimakers.ca
> >> <mailto:projects at vicpimakers.ca>>
> >> *Subject:* [VicPiMakers Projects]
> >> Jim's Challenge - Output 10
> >> (caesar cipher)
> >> I'm looking for clarification on
> >> output 10 - caesar cipher problem.
> >>
> >> Is the intent to calculate the
> >> caesar cipher key value OR is the
> >> intent to encrypt the string with
> >> a pre-determined key? Initially I
> >> thought the question was to
> >> discover the cipher key value, but
> >> on reflection this seems fragile.
> >>
> >> Reasoning:
> >> - "BIOPSY" will work for the 12
> >> integer input that leads to
> >> "HOUVYE", but it will not work for
> >> any 12 random integers.
> >> - You'd have to reverse engineer
> >> your integers starting from
> >> "BIOPSY" to get a valid set of 12
> >> integers.
> >>
> >> I solved it both ways, but posted
> >> only the 2nd solution to github
> >> because only the 2nd solution will
> >> work for a random set of 12
> integers.
> >>
> >> I'm curious how other folks solved
> >> this one.
> >>
> >> --
> >> Projects mailing list
> >> Projects at vicpimakers.ca
> >> <mailto:Projects at vicpimakers.ca>
> >>
> http://vicpimakers.ca/mailman/listinfo/projects_vicpimakers.ca
> >> <
> https://nam10.safelinks.protection.outlook.com/?url=http%3A%2F%2Fvicpimakers.ca%2Fmailman%2Flistinfo%2Fprojects_vicpimakers.ca&data=02%7C01%7C%7Cbe8d0cc14e5245e5aa3808d86e04ed6a%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637380314727338941&sdata=HBzJ15Bq7rk6Kz7FSFgDePfGdHYHUSGowGj19Gjz7Vk%3D&reserved=0
> >
> >>
> >>
> >>
> >> --
> >> George Bowden, vice president,
> >> Victoria Computer Club
> >> gtbowdeng at gmail.com
> >> <mailto:gtbowdeng at gmail.com>
> >> --
> >> Projects mailing list
> >> Projects at vicpimakers.ca
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> >>
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> >
> >>
> >> --
> >> Projects mailing list
> >> Projects at vicpimakers.ca
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> >>
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> >
> >>
> >> --
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> >>
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> >
> >>
> >> --
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> >>
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> >
> > --
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