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 2 100 264 solves
Mathematics Roll your Own 125 165 solves
Symmetric Ciphers Dancing Queen 120 187 solves
General SSH Keys 35 1484 solves
Misc LFSR Destroyer 250 53 solves
Hash Functions Hash Stuffing 50 282 solves
Elliptic Curves Montgomery's Ladder 40 288 solves
Elliptic Curves Double and Broken 50 162 solves
Diffie-Hellman The Matrix Revolutions 125 108 solves
Diffie-Hellman The Matrix Reloaded 100 170 solves
Diffie-Hellman The Matrix 75 240 solves
Crypto on the Web JSON in JSON 40 804 solves
Symmetric Ciphers Oh SNAP 120 186 solves
Misc L-Win 120 155 solves
Misc Bruce Schneier's Password: Part 2 250 77 solves
Misc Bruce Schneier's Password 100 215 solves
Hash Functions Mixed Up 120 192 solves
Crypto on the Web RSA or HMAC? 35 895 solves
Crypto on the Web JWT Secrets 25 1208 solves
Crypto on the Web No Way JOSE 20 1332 solves
Hash Functions Jack's Birthday Hash 20 902 solves
Hash Functions Jack's Birthday Confusion 30 858 solves
Crypto on the Web Token Appreciation 5 2075 solves
Crypto on the Web JWT Sessions 10 1670 solves
Mathematics Cofactor Cofantasy 150 238 solves
Symmetric Ciphers Logon Zero 80 375 solves
RSA RSA Backdoor Viability 175 436 solves
Misc Jeff's LFSR 150 132 solves
General Transparency 50 2192 solves
RSA Let's Decrypt Again 175 154 solves
Hash Functions Twin Keys 100 169 solves
Hash Functions Invariant 250 98 solves
Hash Functions No Difference 175 194 solves
Misc Trust Games 150 127 solves
Hash Functions PriMeD5 100 224 solves
Mathematics Ellipse Curve Cryptography 125 258 solves
RSA Let's Decrypt 80 345 solves
Elliptic Curves No Random, No Bias 120 171 solves
Elliptic Curves Edwards Goes Degenerate 100 181 solves
Mathematics Size and Basis 15 1986 solves
Mathematics Gaussian Reduction 50 1229 solves
Mathematics Find the Lattice 100 668 solves
Mathematics Vectors 10 2073 solves
Mathematics Backpack Cryptography 120 392 solves
Mathematics Gram Schmidt 30 1349 solves
Mathematics What's a Lattice? 40 1471 solves
Mathematics Unencryptable 125 469 solves
Misc Too Many Errors 100 189 solves
Symmetric Ciphers Forbidden Fruit 150 240 solves
Hash Functions Collider 50 665 solves
 


Least Solved
CategoryChallengePointsSolves
Misc LFSR Destroyer 250 53 solves
Misc Bruce Schneier's Password: Part 2 250 77 solves
Hash Functions Invariant 250 98 solves
Diffie-Hellman The Matrix Revolutions 125 108 solves
Misc Trust Games 150 127 solves
Misc Jeff's LFSR 150 132 solves
RSA Let's Decrypt Again 175 154 solves
Misc L-Win 120 155 solves
Elliptic Curves Double and Broken 50 162 solves
Mathematics Roll your Own 125 165 solves
Hash Functions Twin Keys 100 169 solves
Diffie-Hellman The Matrix Reloaded 100 170 solves
Elliptic Curves No Random, No Bias 120 171 solves
Misc Nothing Up My Sleeve 150 179 solves
Elliptic Curves Edwards Goes Degenerate 100 181 solves
Symmetric Ciphers Oh SNAP 120 186 solves
Symmetric Ciphers Dancing Queen 120 187 solves
Misc Too Many Errors 100 189 solves
Hash Functions Mixed Up 120 192 solves
Hash Functions No Difference 175 194 solves
Misc Bruce Schneier's Password 100 215 solves
Hash Functions PriMeD5 100 224 solves
Misc Toshi's Treasure 150 230 solves
Mathematics Cofactor Cofantasy 150 238 solves
Symmetric Ciphers Forbidden Fruit 150 240 solves

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