🧬 Category: Reverse Engineering

Below is a list of Reverse Engineering challenges, they will test your patience and your depth of analysis.

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🔹 Challenge 1: ByteCrypt

Points: 250
Description:

[ SYSTEM BOOTING... ]

[ SHADOW APOCALYPSE PROTOCOL ACTIVE ]

[ INCOMING SIGNAL DETECTED — ID: KRUEGER/FREDDY ]

Encrypted binary intercepted. Payload contains a scrambled verification sequence.
He’s hiding something behind the noise.
Your task: isolate the mutation, reverse the code, and unlock what Freddy is hiding.

[ TRACE ACTIVE — TIME IS RUNNING OUT ]

Flag Format: flag{}
Attachment: freddy

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🔹 Challenge 2: echo_black()

Points: 300
Description:

[BOOT SEQUENCE ENGAGED...]

TRANSMISSION RECEIVED — SOURCE: ██████████ DECAYING SIGNAL LOCKED TO PORT: 6660-NECRO ENTITY DETECTED: “Unknown.protocol.shadowform”

[The cryptic silence stirs.] [The shadows move beneath the data.] [Speak what cannot be spoken.]

Flag Format: flag{}
Attachment: echo_black.jar

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🔹 Challenge 3: Ghost Protocol

Points: 450
Description:

[ SIGNAL INTERCEPTED — ENCRYPTION: OBSIDIAN-XOR ]
[ SOURCE: CLASSIFIED ENTITY “GHOST” ]
[ MESSAGE: CORRUPTED. IDENTITY OBFUSCATED. FAVORITE CEREAL UNKNOWN. ]

A fleeting echo, swallowed by the void. An encrypted signal that shatters the truth.
The fractured message trembles, yet it holds secrets too dangerous to remain hidden.
Only the true passphrase can unravel the shrouded riddle,
while all false attempts only summon the silence of forgotten codes.
Dare you listen to the whispers in the dark?

Flag Format: flag{}
Attachment: ghost_protocol

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🔹 Challenge 4: The Shadowform Protocol

Points: 550
Description:

[SYSTEM INITIATED...]

SIGNAL ACQUIRED — SOURCE: ██████████

DISTORTED FEEDBACK LOCKED TO PORT: 9F2A-VOID

ENTITY IDENTIFIED: “Unknown.protocol.shadowform”

Fragments of the code unravel in a dissonant rhythm. A series of checkpoints, masked in layers, await your touch. A final revelation lies beyond the veil — will you breach it?

Flag Format: FLAG{}
Attachment: shadowform.apk

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🔹 Challenge 5: Velvet Mirage

Points: 600
Description:

[SYSTEM INITIATED...]

SIGNAL ACQUIRED — SOURCE: ██████████

DISTORTED FEEDBACK LOCKED TO PORT: 9F2A-VOID

ENTITY IDENTIFIED: “Unknown.protocol.redvelvet”

The sequence fractures. Strings twist, constraints tighten, and a shadow lurks beneath the surface. A forgotten hash whispers, the answer elusive, buried in layers of code.

Flag Format: FLAG{}
Attachment: velvet

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