New Challenges

This page contains lists of recent and most difficult challenges. To play the challenges, please go to the challenges section.
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Recently Released
CategoryChallengePointsSolves
Crypto on the Web RSA or HMAC? Part 2 100 172 solves
Mathematics Roll your Own 125 113 solves
Symmetric Ciphers Dancing Queen 120 112 solves
General SSH Keys 35 967 solves
Misc LFSR Destroyer 250 33 solves
Hash Functions Hash Stuffing 50 184 solves
Elliptic Curves Montgomery's Ladder 40 164 solves
Elliptic Curves Double and Broken 50 110 solves
Diffie-Hellman The Matrix Revolutions 125 64 solves
Diffie-Hellman The Matrix Reloaded 100 98 solves
Diffie-Hellman The Matrix 75 144 solves
Crypto on the Web JSON in JSON 40 655 solves
Symmetric Ciphers Oh SNAP 120 138 solves
Misc L-Win 120 110 solves
Misc Bruce Schneier's Password: Part 2 250 46 solves
Misc Bruce Schneier's Password 100 162 solves
Hash Functions Mixed Up 120 140 solves
Crypto on the Web RSA or HMAC? 35 740 solves
Crypto on the Web JWT Secrets 25 994 solves
Crypto on the Web No Way JOSE 20 1086 solves
Hash Functions Jack's Birthday Hash 20 706 solves
Hash Functions Jack's Birthday Confusion 30 712 solves
Crypto on the Web Token Appreciation 5 1695 solves
Crypto on the Web JWT Sessions 10 1370 solves
Mathematics Cofactor Cofantasy 150 184 solves
Symmetric Ciphers Logon Zero 80 279 solves
RSA RSA Backdoor Viability 175 308 solves
Misc Jeff's LFSR 150 100 solves
General Transparency 50 1787 solves
RSA Let's Decrypt Again 175 120 solves
Hash Functions Twin Keys 100 123 solves
Hash Functions Invariant 250 73 solves
Hash Functions No Difference 175 140 solves
Misc Trust Games 150 100 solves
Hash Functions PriMeD5 100 166 solves
Mathematics Ellipse Curve Cryptography 125 209 solves
RSA Let's Decrypt 80 272 solves
Elliptic Curves No Random, No Bias 120 132 solves
Elliptic Curves Edwards Goes Degenerate 100 136 solves
Mathematics Size and Basis 15 1685 solves
Mathematics Gaussian Reduction 50 1018 solves
Mathematics Find the Lattice 100 548 solves
Mathematics Vectors 10 1753 solves
Mathematics Backpack Cryptography 120 326 solves
Mathematics Gram Schmidt 30 1125 solves
Mathematics What's a Lattice? 40 1248 solves
Mathematics Unencryptable 125 381 solves
Misc Too Many Errors 100 151 solves
Symmetric Ciphers Forbidden Fruit 150 197 solves
Hash Functions Collider 50 540 solves
 


Least Solved
CategoryChallengePointsSolves
Misc LFSR Destroyer 250 33 solves
Misc Bruce Schneier's Password: Part 2 250 46 solves
Diffie-Hellman The Matrix Revolutions 125 64 solves
Hash Functions Invariant 250 73 solves
Diffie-Hellman The Matrix Reloaded 100 98 solves
Misc Jeff's LFSR 150 100 solves
Misc Trust Games 150 100 solves
Misc L-Win 120 110 solves
Elliptic Curves Double and Broken 50 110 solves
Symmetric Ciphers Dancing Queen 120 112 solves
Mathematics Roll your Own 125 113 solves
RSA Let's Decrypt Again 175 120 solves
Hash Functions Twin Keys 100 123 solves
Elliptic Curves No Random, No Bias 120 132 solves
Elliptic Curves Edwards Goes Degenerate 100 136 solves
Symmetric Ciphers Oh SNAP 120 138 solves
Hash Functions Mixed Up 120 140 solves
Hash Functions No Difference 175 140 solves
Diffie-Hellman The Matrix 75 144 solves
Misc Nothing Up My Sleeve 150 147 solves
Misc Too Many Errors 100 151 solves
Misc Bruce Schneier's Password 100 162 solves
Elliptic Curves Montgomery's Ladder 40 164 solves
Hash Functions PriMeD5 100 166 solves
Crypto on the Web RSA or HMAC? Part 2 100 172 solves

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