Jumping Chain Hash
100 points Hard

Jim designed a new way to encode strings of purely lowercase letters through the Jumping Chain Hash (JCH). He tested it on several strings and was very happy with the result! Jim was so confident that he decided to encode his bitcoin account password, but then his decryption algorithm broke! Luckily, Jim documented the JCH here: - https://mega.nz/#!CfhnnYjL!D6G-Ho0OxBthJ4LTJojrtNU6jV_5GJlbCYOgNMErO2w - His encrypted password (your input) is here: https://mega.nz/#!bH4XQIrL!tn3jWY4iqjuVlGggjEgHZLCAlUuQDE0cXIo8FS4LvlE - Can you help Jim recover his bitcoin account?

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Programming ยท adapap
146 solves
Rating 4.25
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Discussion

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Varius93

1 year ago

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please help me, i think i found the flag but it doesn't work. Either I don't have the right flag or I don't have the right format

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cythonboy

2 years ago

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you can write a simple script which find the intial value of inner loop then add+1 in it get the flag

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Modko42

2 years ago

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Mike_Root

3 years ago

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A cruel joke. Look closely at examples.

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0xYa5h

3 years ago

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IT_Oracle

3 years ago

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That was a very fun challenge, thank you for the programming challenge and introducing me a little bit to block chaining. As others have said, the cipher might be a little too easy to crack.

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krzsernik

4 years ago

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Pretty easy after realizing a certain thing

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moroq

4 years ago

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technic

4 years ago

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IronLarreh_

4 years ago

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