[ art /
civ /
cult /
cyb /
diy /
drg /
feels /
layer /
lit /
λ /
q /
r /
sci /
sec /
tech /
w /
zzz ]
archive provided by **lainchan.jp**

[ Return /
Go to bottom ]

File: 1470704111973.png (32.92 KB, 300x276, 1470166361108.jpg)

How would one go about decoding a numeric cipher?

Also cryptography thread

Also cryptography thread

File: 1470709873341.png (8.44 MB, 200x200, Applied Cryptography (2ed) - B. Schneier (1996).pdf)

This is objectively the best book on cryptography

>>/tech/res/26059.html#26068

Is there any reason you think cryptography isn't technology

Is there any reason you think cryptography isn't technology

File: 1470798897431.png (3.73 MB, 200x200, Hacking-Secret-Ciphers-With-Python.pdf)

>>34930

And here is the .pdf if you're into that kind of thing.

And here is the .pdf if you're into that kind of thing.

File: 1470802085849.png (118.96 KB, 200x200, 1470800483536.jpg)

I got a password protected rar that needs to be opened. The hints for the password are:

76.353503184713375796178343949045

1756.2038216560509554140127388535

1603.4904458598726114649681528662

1298.0636942675159235668789808917

1915.0159744408945686900958466454

1221.7070063694267515923566878981

1603.4904458598726114649681528662

1068.9936305732484076433121019108

01000100

x = (n*p) / pc

The picture in my post might be relevant too. Anyone got any clues what cipher it could be / what the process is? The file is only available for 2 days here: http://expirebox.com/download/e83c64f4e2fdce5f68732d91e6dc2e7c.html

Any help would be appreciated

76.353503184713375796178343949045

1756.2038216560509554140127388535

1603.4904458598726114649681528662

1298.0636942675159235668789808917

1915.0159744408945686900958466454

1221.7070063694267515923566878981

1603.4904458598726114649681528662

1068.9936305732484076433121019108

01000100

x = (n*p) / pc

The picture in my post might be relevant too. Anyone got any clues what cipher it could be / what the process is? The file is only available for 2 days here: http://expirebox.com/download/e83c64f4e2fdce5f68732d91e6dc2e7c.html

Any help would be appreciated

>>34936

>>34937

what confuses me are the decimals, I don't see how I'd get them back to text.

So far I assumed x would be the cipher end result, for example 76.353.. and n would indicate the length of the plaintext, p stand for a prime. I think pc is different from the p in (n*p), wouldn't make any sense.

>>34937

what confuses me are the decimals, I don't see how I'd get them back to text.

So far I assumed x would be the cipher end result, for example 76.353.. and n would indicate the length of the plaintext, p stand for a prime. I think pc is different from the p in (n*p), wouldn't make any sense.

>>34936

I think the lower pc is different as otherwise it would be written as p*c, right?

>>34933

Got the original post, as if this picture is relevant then it could make the process a whole lot harder.

Things I played around with:

01000100 = 68 [dec] = 44 [hex]

All those numbers multiplied give:

1119301859398908872916874 . 59733115802066384500139372453784907161446149870635329125804568617466446668654915987720145155955616313847841409942622599797733192456332585135874626472108931912918985564667732479999000146756336473640389239329896903536503839752

Not a prime, not very helpful.

I think the lower pc is different as otherwise it would be written as p*c, right?

>>34933

Got the original post, as if this picture is relevant then it could make the process a whole lot harder.

Things I played around with:

01000100 = 68 [dec] = 44 [hex]

All those numbers multiplied give:

1119301859398908872916874 . 59733115802066384500139372453784907161446149870635329125804568617466446668654915987720145155955616313847841409942622599797733192456332585135874626472108931912918985564667732479999000146756336473640389239329896903536503839752

Not a prime, not very helpful.