Day 21

crypto/strive-marish-leadman-typecdr

Strive Marish Leadman TypeCDR

Authors: I Izunks
,

n nalo_
Category: crypto

By its name and description, this challenge looks like it involve some insane crypto system. However, we are given some data that purelly look like some RSA parameters:

1
p: 0xfc54245a72937e20997d6e045bb8c1e57aea5ff89c969edadf72ed6c997ecf11bbf182e5e31ae89afea0899633a7e83f4d11a0f064d39ffe3ab7c018316d8195
2
q: 0xd696926a14ad1fe8db89d3568ddf6b0f6dbe6c95a19ba631f9e1b3443affc3a391fe11685f1d12557e1bae7a866ad4f2899df71707794e4a734fa7f9b5f9fa99
3
d: 0x5410103dc3e5d16a0ca8d08b92bcdb40df66a1cfb4ac6470204ad0df72729293128989210dc36bb90cabdc4496baaf5dbfa03bf45bd1eebea8eaae656370e4038f48fc7d98dd9ff4dd592b38e122530ecdd6f7d51d9b496664d0ec2866cb0e268bfce052230ea8f8a9b4581a2602843b4a9bbbdd8502c2eaa9e43a82fa40d021
4
e: 0x10001
5
n: 0xd382c00174ba47ce0d88484d2a5ad07011d7ee87485e0c86c626487f2c32cd9b3b0b8b8a1678ec65a1202d736caf5be8d59c28bc12e49d245f1cd6ed87e65cbb88c1d865763b58fa48fcd7c268ad6fb153ec950bb4e5d318c358fb3e2beea7cbc8878c830cf76af76ec76be5302d798133866d6a64c8d8aceaea2bc8ddeaf40d
6

7
0xc428958295bc86bf6451fa2f6de53886be7a60aa77778cb425f32a1ab2685bcb3f5d20a38e6321b299f8404a597ed81a459feefc8ed1b9b8a811835bd5341ad756eaa672c5878eb433a6c4c96299a62d3107ab1d337833b92e65649378492f8be2f5367e1ff143319e18f18ed2450cb3b00692f2f2bd8e4eccb53d6055b2759

The only difference is that everything is in hexadecimal. Let’s quickly convert everything to decimal:

1
p: 13215525284117887338338975718478711635012692445299094488521623812177211567811443135375110677124365132973823272079567992826305910126177686485207396937204117
2
q: 11238894488016712279668735736196696131443680381109892860286828081344021645212233883790073421491616231721355284876613215634203408900048277646556316508486297
3
d: 59030869006830472160913024704436993226117267396955720945716177509228482068255055758991953849234236002688981755773167772223019676727180646487847061788673209092037335266716733877885457212054678133130266881924548696855032896700266444047068991287015605969708249994318849954197933310731644595888885339213485101089
4
e: 65537
5
n: 148527894271918019503580331710165747497218388044469116735877495505137137839568149471227230752764776170316266645990175309562715113205714210038546968497112018321845995552836443291044629678533939943183526322247576394960446942012779267141247693689382977652066487318829328026268158569956327714840773161034986484749
6

7
8609200320802067579507183623226675490231987921457258535656021265624785806504849461831397187896235511777484764811908487192349314540291728593289141961530944054980490005423534652143964077047561105590007331852241373056118581566545984035326012674801240734730788549018349689091287272031492466535809673595706877785

Then, we can use some online tool to decode this for us, like DCode. C is the message (last number of the file):

Magic decoding

That’s it!

web/helpful-desk

HelpfulDesk

Category: web

TODO