Oct
25

Hack.lu 2013 CTF – Crypto 350 (BREW’r’Y)

BREW’r’Y (Category: Crypto) Author(s): dwuid Finally, the robots managed to sneak into one of our breweries. I guess I won’t have to explain how bad that really is. That darn non-physical ones even shutdown our login system. Shiny thing, advanced technology, all based on fingerprints. Been secure as hell. If only it was running. Well,… Continue reading »

Jun
17

Defcon CTF Quals 2013 – \xff\xe4\xcc 4 (penser)

good luck. penser.shallweplayaga.me:8273 http://assets-2013.legitbs.net/liabilities/penser Download penser binary » Summary: x86_64 Unicode-proof shellcoding.

Jun
17

Defcon CTF Quals 2013 – \xff\xe4\xcc 3 (linked)

typedef struct _llist { struct _llist *next; uint32_t tag; char data[100]; llist; and: register char *answer; char *(*func)(); llist *head; … func = (char *(*)(llist *))userBuf; answer = (char *)(*func)(head); send_string(answer); exit(0); Write me shellcode that traverses the randomly generated linked list, looking for a node with a tag 0x41414100, and returns a pointer to… Continue reading »

Jun
17

Defcon CTF Quals 2013 – All Web Challenges (3dub)

Summary: 3dub (1) – babysfirst: SQLite SQL injection 3dub (2) – badmedicine: Stream cipher bit flipping 3dub (3) – hypeman: Rack/Sinatra session secret disclosure 3dub (4) – rememberme: Bruteforce 3dub (5) – worsemedicine: Block cipher bit flipping

Jun
02

PHD CTF 2013 Hackskell (500)

We’ve got a screenshot of some encryption, here’s the text transcribed. Please say what’s there. Summary: a couple of modular equations

Jun
02

PHD CTF 2013 from hell import crypto (100)

Decrypt the message: 7y9rr177sluqv1r4pw Hint: $ at

Jun
02

PHD CTF 2013 ReStART (400)

We heard hellman encrypted the flag using his super secure keygen. Break it! Summary: RSA with the lower half of the secret exponent bits leaked.

Apr
22

PlaidCTF 2013 Blech (Crypto 200)

You get arbitrary code execution…. as long as it’s code we approve of. Source available at blech.py Service running on 54.234.73.81 port 1234 blech.py Summary: RSA cube root attack

Feb
20

Gits ctf 2013 Crypto 500

Crypto 500 file Summary: breaking cipher

Feb
06

MSLC presents: Craptography Awards

Team More Smoked Leet Chicken proudly presentsCraptography Awards «You suck at crypto — we have an award for you!» Today’s Nominees