[First time posting so apologies if this is an inappropriate question for this site.]
I recently finished reading the book “Gnomon” by Nick Harkaway. At the start of the book there’s a set of numbers that represent a code of some sort.
The code itself is - " DCAC:/ 3455 6671 1643 2776 6655 5443 2147 7654 5667 7122 7543 1177 7666 5543 2511 7656 7711 2331 6542 2111 7776 6543 6221 7671 1223 4427 6533 2221 7671 1223 4427 6533 2221 7671 1223 4427 6533 2221 1177 6547 3321 7122 3345 5317 6443 3322 2117 6514 4322 3445 5677 5321 6655 […] "
The author posted some hints on Twitter 4 years ago they are listed below:
- who am I? I have zero skills in this area [computer based cryptography]; I intend this to be breakable; I did not intend that you should need a supercomputer…
- What’s the book about? What kind of book is it?
- Who did Bletchley Park recruit apart from mathematicians?
- To solve this you need the book; a piece of paper and a pencil; access to one document from the library or the internet; to treat the problem like a puzzle as much as a code :)
He also writes that the process of breaking the code will require an intuitive leap. After that he suspects that decryption will be straightforward.
One person who has cracked it wrote: “it’s not cryptographically sophisticated. It’s more of a sudden realization. The encryption is lossy to a degree, but that doesn’t matter in a way. You could start by looking what’s there and what isn’t”
Based on all this I’d guess that the code is a book cipher that uses another book as the key (no idea what book this might be), where the first two digits of each quadruple are the page number and the second two numbers are the nth word (based on the repetition of some the quadruples e.g. 4427, possibly representing a repeated word).
The book contains several themes/repeating motifs (I’m unsure as to whether any of these may be relevant to cracking the code, but thought I would supply them to save you from having to read the book): consciousness, reality, non-linear narrative, computer attacks where the attack code is broken up into components and then reassembled, surveillance, fire judges, firespine, detectives/hunters, the number 4, sharks, the game “Go”, the chamber of isis, catabasis, alchemy and possibly a key word “Activation”.
There are more details on this Reddit page here. Along with screenshots of the author’s tweets.
Any help would be greatly appreciated— no idea how to crack this otherwise.