oracle-for-block-cipher-enthusiasts

DownUnderCTF 2022 - oracle for block cipher enthusiasts

• Category: crypto
• Solves: 102/1970
• Difficulty: ⭐️
• Hosting type: tcp
• Tags: OFB

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Here's one fun block cipher mode of operation puzzle for you.

Handout files:

• ./publish/ofb.py

Solution

Flag: DUCTF{0fb_mu5t_4ctu4lly_st4nd_f0r_0bvi0usly_f4ul7y_bl0ck_c1ph3r_m0d3_0f_0p3ra710n_7b9cb403e8332c980456b17a00abd51049cb8207581c274fcb233f3a43df4a}

• Solver