All Writeups
Comprehensive collection of CTF challenges, solutions, and insights.
Filter by category:
Filter by tag:
All Tags
Raptor-Weekly (14)
ctf (3)
retrospective (3)
overview (3)
ECHELON (12)
DEADROP (37)
WHAMazon! (23)
pcap (13)
base64 (10)
network (10)
Club-Ouroboros (1)
acrostic (1)
aes (2)
aes-cbc (3)
aes-gcm (1)
alg-none (1)
algorithm-confusion (1)
anti-debug (1)
api (5)
api-chaining (1)
auth-bypass (1)
authentication-bypass (1)
autopsy (1)
bash (1)
beaconing (1)
binary (1)
block-cipher (1)
brute-force (3)
bytecode (2)
c2 (3)
cbc (2)
chacha20 (1)
chain (1)
classical-cipher (1)
cloud-metadata (1)
cloudflare-tunnel (1)
command-injection (3)
config-leak (1)
constraint-solving (1)
cookie-theft (2)
core-dump (1)
covert-channel (1)
credential-hunting (1)
credential-reuse (1)
crib-drag (3)
cross-site-scripting (1)
crypto (7)
csp-bypass (1)
cube-root (1)
custom-crypto (1)
custom-isa (2)
custom-properties (1)
cyberchef (2)
darknet-services (1)
decryption (1)
default-credentials (1)
deobfuscation (2)
diffie-hellman (1)
directory-traversal (1)
discrete-log (1)
disk-image (2)
dns (2)
dns-exfiltration (1)
docker (1)
docx (1)
dsa (2)
ecdlp (1)
elf (5)
elliptic-curve (1)
email-forensics (1)
eml (1)
encoding (1)
encoding-chains (1)
encryption (1)
enumeration (1)
error-correction (1)
eval (1)
event-handler (1)
exfiltration (3)
exif (1)
feistel (1)
fetch (1)
ffuf (2)
file-recovery (1)
firmware (1)
flask (3)
foia (1)
forensics (8)
ftp (2)
full-chain (1)
ghidra (4)
github (2)
headers (1)
hex (5)
hidden-partition (1)
hmac (1)
hs256 (1)
html (1)
https (1)
iam (1)
icmp (1)
idor (2)
image-forensics (1)
img-tag (1)
implementation (1)
information-schema (1)
internal-services (1)
iv-reuse (1)
jail-escape (1)
javascript (1)
jinja2 (2)
json (1)
jwt (6)
jwt.io (1)
key-reuse (1)
kill-chain (1)
known-plaintext (3)
lateral-movement (1)
ld-preload (1)
lfi (1)
linkedin (1)
linux (4)
listener (1)
llm-security (1)
local-file-inclusion (1)
localhost (1)
loopback (1)
low-nonce (1)
lsb (2)
ltrace (1)
malware-analysis (1)
marshal (1)
memory (1)
meta (1)
multi-artifact (1)
multi-machine (1)
multi-stage (2)
network-pentest (1)
no-padding (1)
nonce-reuse (2)
none-algorithm (1)
oaep (1)
obfuscation (4)
office-formats (1)
os-shell (1)
osint (4)
otp-reuse (1)
padding (1)
padding-oracle (1)
partial-key (1)
path-traversal (2)
pcapng (2)
pdf (1)
pe (1)
php-deserialization (1)
pkcs1 (1)
pkcs1-v15 (1)
plaintext (1)
png (2)
pohlig-hellman (2)
polyglot (1)
powershell (3)
pre-master-secret (1)
private-key-recovery (2)
privesc (1)
privilege-escalation (2)
prompt-injection (1)
pyarmor (1)
pycryptodome (1)
python (7)
rc4 (1)
rce (4)
readelf (1)
recon (4)
reconnaissance (1)
reconstruction (1)
red-vs-blue (1)
reed-solomon (1)
register-machine (1)
restricted-shell (1)
rev (6)
reverse-engineering (3)
rfc822 (1)
robots.txt (1)
rot13 (1)
rs256 (1)
rsa (4)
runtime-generation (1)
scapy (1)
security-misconfiguration (1)
server-side-request-forgery (1)
session-keys (1)
session-manipulation (1)
signature (2)
signature-forgery (1)
sleuthkit (1)
small-exponent (1)
smb (1)
smooth-order (1)
smt (1)
snmp (1)
socat (1)
social-media (1)
source-code (1)
source-review (1)
sqli (3)
sqlite (1)
ssrf (4)
ssti (2)
static-analysis (2)
steganography (6)
stegsolve (1)
stored-xss (1)
stream-cipher (1)
streams (1)
string-array (1)
strings (3)
symmetric (1)
template-injection (1)
tls (2)
tls-decryption (1)
token-forgery (3)
token-manipulation (1)
traffic-analysis (1)
tshark (4)
two-time-pad (1)
udp (1)
unicode (1)
union-injection (1)
unit7 (1)
vigenere (1)
vm (2)
web (5)
whitespace (1)
windows (3)
winrm (1)
wireshark (5)
xml (1)
xobject (1)
xor (5)
xss (2)
z3 (1)
zsteg (1)
2026-03-01
Crypto
Medium
DEADROP Crypto 3 - oracle_session.py
AES-CBC padding oracle attack against the agency's internal session token system. The oracle reveals one bit per query, valid or invalid PKCS#7 padding, which is enough to recover the full plaintext byte by byte.
aes
cbc
padding-oracle
block-cipher
2026-02-24
Crypto
Easy
WHAMazon! Crypto 4 - Sticky Note Security
Identifying a human-readable AES key from challenge lore, then decrypting by recognizing that a rushed engineer reused it as the IV.
aes
cbc
symmetric
key-reuse