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Challenges

Category
Difficulty
CTFtime weight
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Higher weight ≈ harder, more prestigious event.
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Must have
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5 challenges tagged #keystream-reuse ✕ clear · browse all techniques

Challenge CTF Weight Category Has
encrypted_chat
#many-time-pad#keystream-reuse#race-condition
 TPCTF 2025 – Crypto files wu 1
BabyRC4
#rc4#keystream-reuse
 SEETF 2023 – Crypto files wu 1
ransomwaRE
#malware-reversing#date-seeded-key#aes-ctr#keystream-reuse
 CSAW 2021 Quals 20.54 Reverse files wu 2
malware
#aes-ctr#known-plaintext#keystream-reuse
 UMassCTF 2021 23.56 Crypto files wu 3
My_BetterZED
#aes-cfb#iv-reuse#keystream-reuse
 PwnMe 2025 Quals 24.95 Crypto files wu 1