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8 kyu
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7 kyu
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4 kyu
3 kyu
2 kyu
1 kyu
hardest
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20
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2
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1
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20
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20
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3
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1
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4
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7
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10
FEATURED TAGS
Cryptography
Data Science
Debugging
Games
Tutorials
20 Kata Found
5 kyu
GA-DE-RY-PO-LU-KI cypher vol 4 - Missing key madness
98
dcieslak
1 Issue Reported
Performance
Algorithms
Ciphers
Cryptography
6 kyu
Polybius square cipher - encode
1,338
tiriana
Cryptography
Ciphers
Algorithms
6 kyu
Rotation Cipher Cracker
926
NicholasSeward
1 Issue Reported
Ciphers
Cryptography
Algorithms
Security
Puzzles
6 kyu
Cubic Tap Code
584
KayleighWasTaken
Ciphers
Algorithms
Cryptography
6 kyu
Simple ROT13.5 cypher
713
user9247539
1 Issue Reported
Algorithms
Fundamentals
Ciphers
Cryptography
3 kyu
Rail Fence Cipher: Encoding and Decoding
9,050
darrentburgess
3 Issues Reported
Algorithms
Ciphers
Cryptography
Strings
Security
6 kyu
Encrypt this!
23,568
suic
Fundamentals
Strings
Regular Expressions
Arrays
Ciphers
Algorithms
Cryptography
Security
Beta
Cryptography in Characters
7
alex.qm
Status:
Testing & feedback needed
Estimated Rank:
5 kyu
Strings
Ciphers
Fundamentals
Cryptography
Algorithms
7 kyu
Cipher from math problem
467
user9015794
Cryptography
Mathematics
Ciphers
Algorithms
3 kyu
Breaking the Vigenère Cipher
417
petermaier1
Ciphers
Cryptography
Algorithms
Beta
Cracking Vigenère: unknown language
7
jharris3791
3 Issues Reported
Status:
Testing & feedback needed
Estimated Rank:
3 kyu
Puzzles
Strings
Ciphers
Algorithms
Cryptography
Security
5 kyu
A Scandal in Bohemia
121
rge123
Ciphers
Cryptography
Security
Strings
Algorithms
Beta
Jack & Jill's cipher
38
sh7dm
1 Issue Reported
Status:
Waiting for issues to be resolved
Estimated Rank:
6 kyu
Cryptography
Ciphers
Arrays
Algorithms
Beta
Bob's Secret Cipher
13
B1ts
Status:
Testing & feedback needed
Estimated Rank:
6 kyu
Ciphers
Algorithms
Cryptography
Security
Strings
Puzzles
7 kyu
Bitty Words
209
Austin Haws
1 Issue Reported
Strings
Binary
Algorithms
Ciphers
Cryptography
7 kyu
Cipher
601
bubmet
Algorithms
Ciphers
Cryptography
Strings
6 kyu
Hex cipher
326
kingcobra
Cryptography
Object-oriented Programming
Ciphers
Algorithms
6 kyu
Encryption and decryption--Matrix pair
51
myjinxin2015
1 Issue Reported
Puzzles
Algorithms
Matrix
Ciphers
Cryptography
Beta
Playfair cipher
7
durfi
1 Issue Reported
Status:
Testing & feedback needed
Estimated Rank:
4 kyu
Ciphers
Cryptography
Security
Strings
Algorithms
4 kyu
Cracking the Vigenère cipher, step 1: determining key length
155
NaMe613
1 Issue Reported
Strings
Cryptography
Ciphers
Algorithms
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