2020weight 0.00HackerDom

HITB LOCKDOWN CTF 2020

4 challenges with 4 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.

Full task list on CTFtime

Misc2

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Solve it with:Brainfuck and esolang decoder Cipher identifier and automatic decoder Regex tester with match offsets and capture groups Learn: Recognising encodings

pfs
1 writeup
- perl
- fuse
Same technique in picoCTF: Permissions, Specialer, Codebook
receipts
1 writeup
Same technique in picoCTF: Permissions, Specialer, Codebook

Cryptography1

Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.

Solve it with:Cipher identifier and automatic decoder Vigenere cipher solver with automatic key recovery RSA decryption and attack runner Wiener’s attack on small RSA private exponents In-browser hash cracker with rule transforms Learn: Classical ciphers and frequency analysis Learn: RSA and the parameters that break it

ElectroCore
1 writeup
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

Binary exploitation1

Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.

Solve it with:ROP gadget finder Shellcode assembler and library Cyclic pattern generator and offset finder Format string exploit builder Learn: Binary exploitation

ips
1 writeup
- python
- kernel
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3

Misc2

pfs

receipts

Cryptography1

ElectroCore

Binary exploitation1

ips

Other 2020 events