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 2 100 141 solves
Mathematics Roll your Own 90 88 solves
Symmetric Ciphers Dancing Queen 120 97 solves
General SSH Keys 35 758 solves
Misc LFSR Destroyer 250 27 solves
Hash Functions Hash Stuffing 50 129 solves
Elliptic Curves Montgomery's Ladder 40 111 solves
Elliptic Curves Double and Broken 50 89 solves
Diffie-Hellman The Matrix Revolutions 125 43 solves
Diffie-Hellman The Matrix Reloaded 100 70 solves
Diffie-Hellman The Matrix 75 110 solves
Crypto on the Web JSON in JSON 40 591 solves
Symmetric Ciphers Oh SNAP 120 124 solves
Misc L-Win 120 99 solves
Misc Bruce Schneier's Password: Part 2 250 39 solves
Misc Bruce Schneier's Password 100 144 solves
Hash Functions Mixed Up 120 119 solves
Crypto on the Web RSA or HMAC? 35 684 solves
Crypto on the Web JWT Secrets 25 903 solves
Crypto on the Web No Way JOSE 20 980 solves
Hash Functions Jack's Birthday Hash 20 638 solves
Hash Functions Jack's Birthday Confusion 30 641 solves
Crypto on the Web Token Appreciation 5 1515 solves
Crypto on the Web JWT Sessions 10 1236 solves
Mathematics Cofactor Cofantasy 150 157 solves
Symmetric Ciphers Logon Zero 80 232 solves
RSA RSA Backdoor Viability 175 268 solves
Misc Jeff's LFSR 150 91 solves
General Transparency 50 1644 solves
RSA Let's Decrypt Again 175 109 solves
Hash Functions Twin Keys 100 109 solves
Hash Functions Invariant 250 67 solves
Hash Functions No Difference 175 122 solves
Misc Trust Games 150 93 solves
Hash Functions PriMeD5 100 146 solves
Mathematics Ellipse Curve Cryptography 125 186 solves
RSA Let's Decrypt 80 243 solves
Elliptic Curves No Random, No Bias 120 119 solves
Elliptic Curves Edwards Goes Degenerate 100 122 solves
Mathematics Size and Basis 15 1502 solves
Mathematics Gaussian Reduction 50 915 solves
Mathematics Find the Lattice 100 486 solves
Mathematics Vectors 10 1554 solves
Mathematics Backpack Cryptography 120 289 solves
Mathematics Gram Schmidt 30 997 solves
Mathematics What's a Lattice? 40 1108 solves
Mathematics Unencryptable 125 342 solves
Misc Too Many Errors 100 142 solves
Symmetric Ciphers Forbidden Fruit 150 188 solves
Hash Functions Collider 50 477 solves
 


Least Solved
CategoryChallengePointsSolves
Misc LFSR Destroyer 250 27 solves
Misc Bruce Schneier's Password: Part 2 250 39 solves
Diffie-Hellman The Matrix Revolutions 125 43 solves
Hash Functions Invariant 250 67 solves
Diffie-Hellman The Matrix Reloaded 100 70 solves
Mathematics Roll your Own 90 88 solves
Elliptic Curves Double and Broken 50 89 solves
Misc Jeff's LFSR 150 91 solves
Misc Trust Games 150 93 solves
Symmetric Ciphers Dancing Queen 120 97 solves
Misc L-Win 120 99 solves
Hash Functions Twin Keys 100 109 solves
RSA Let's Decrypt Again 175 109 solves
Diffie-Hellman The Matrix 75 110 solves
Elliptic Curves Montgomery's Ladder 40 111 solves
Hash Functions Mixed Up 120 119 solves
Elliptic Curves No Random, No Bias 120 119 solves
Elliptic Curves Edwards Goes Degenerate 100 122 solves
Hash Functions No Difference 175 122 solves
Symmetric Ciphers Oh SNAP 120 124 solves
Hash Functions Hash Stuffing 50 129 solves
Misc Nothing Up My Sleeve 150 138 solves
Crypto on the Web RSA or HMAC? Part 2 100 141 solves
Misc Too Many Errors 100 142 solves
Misc Bruce Schneier's Password 100 144 solves

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