# \[SOLVED\] encoding and decoding

**URL:** <https://onehack.st/t/solved-encoding-and-decoding/74506>\
**Category:** Tutorials & Methods\
**Tags:** solved\
**Created:** [March 22, 2020, 8:22am UTC](https://onehack.st/t/solved-encoding-and-decoding/74506 "2020-03-22T08:22:41Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Omkar\_Guntoju](https://onehack.st/user_avatar/onehack.st/omkar_guntoju/32/20354_2.png) [@Omkar\_Guntoju](https://onehack.st/u/Omkar_Guntoju)\
**Post date:** [March 22, 2020, 8:22am UTC](https://onehack.st/t/solved-encoding-and-decoding/74506/1 "2020-03-22T08:22:41Z")

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do anyone know about Hill chiffer encoding.  
how to decode or encode this?  
Matrix given: 3/2 3/5  
Decoded word: VAWWVAGB

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**Author:** ![kornbolt](https://onehack.st/user_avatar/onehack.st/kornbolt/32/8719_2.png) [@kornbolt](https://onehack.st/u/kornbolt)\
**Post date:** [March 22, 2020, 8:52am UTC](https://onehack.st/t/solved-encoding-and-decoding/74506/2 "2020-03-22T08:52:38Z")

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> **[Hill Cipher - GeeksforGeeks](https://www.geeksforgeeks.org/dsa/hill-cipher/)**
>
> Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and...

Btw the decoded string for the above encoded string is : DECODEDZ

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<div class="post-metadata">

**Author:** ![Omkar\_Guntoju](https://onehack.st/user_avatar/onehack.st/omkar_guntoju/32/20354_2.png) [@Omkar\_Guntoju](https://onehack.st/u/Omkar_Guntoju)\
**Post date:** [March 22, 2020, 12:27pm UTC](https://onehack.st/t/solved-encoding-and-decoding/74506/3 "2020-03-22T12:27:49Z")

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thanks i got it

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**Author:** ![d3m1g0d](https://onehack.st/user_avatar/onehack.st/d3m1g0d/32/24102_2.png) [@d3m1g0d](https://onehack.st/u/d3m1g0d)\
**Post date:** [March 22, 2020, 1:48pm UTC](https://onehack.st/t/solved-encoding-and-decoding/74506/4 "2020-03-22T13:48:58Z")

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you need to find the inverse of the key matrix, let it be (k inverse)  
since both the matrix is of order 3 , you need to create seperate matrix with three rows and use formula  
[3\*1 matrix] \* (k inverse) mod 26, i know you wouldn’t get the idea from here so i am posting a youtube video below

[![](https://img.youtube.com/vi/6T46sgty4Mk/maxresdefault.jpg "Hill Cipher Encryption and Decryption with Numerical | Everything about Hill Cipher") ](https://www.youtube.com/watch?v=6T46sgty4Mk&t=252s)