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 2 100 213 solves
Mathematics Roll your Own 125 134 solves
Symmetric Ciphers Dancing Queen 120 151 solves
General SSH Keys 35 1133 solves
Misc LFSR Destroyer 250 39 solves
Hash Functions Hash Stuffing 50 226 solves
Elliptic Curves Montgomery's Ladder 40 207 solves
Elliptic Curves Double and Broken 50 134 solves
Diffie-Hellman The Matrix Revolutions 125 94 solves
Diffie-Hellman The Matrix Reloaded 100 141 solves
Diffie-Hellman The Matrix 75 200 solves
Crypto on the Web JSON in JSON 40 714 solves
Symmetric Ciphers Oh SNAP 120 161 solves
Misc L-Win 120 130 solves
Misc Bruce Schneier's Password: Part 2 250 65 solves
Misc Bruce Schneier's Password 100 190 solves
Hash Functions Mixed Up 120 170 solves
Crypto on the Web RSA or HMAC? 35 808 solves
Crypto on the Web JWT Secrets 25 1075 solves
Crypto on the Web No Way JOSE 20 1181 solves
Hash Functions Jack's Birthday Hash 20 782 solves
Hash Functions Jack's Birthday Confusion 30 774 solves
Crypto on the Web Token Appreciation 5 1829 solves
Crypto on the Web JWT Sessions 10 1480 solves
Mathematics Cofactor Cofantasy 150 214 solves
Symmetric Ciphers Logon Zero 80 321 solves
RSA RSA Backdoor Viability 175 364 solves
Misc Jeff's LFSR 150 119 solves
General Transparency 50 1900 solves
RSA Let's Decrypt Again 175 135 solves
Hash Functions Twin Keys 100 148 solves
Hash Functions Invariant 250 84 solves
Hash Functions No Difference 175 171 solves
Misc Trust Games 150 112 solves
Hash Functions PriMeD5 100 198 solves
Mathematics Ellipse Curve Cryptography 125 235 solves
RSA Let's Decrypt 80 306 solves
Elliptic Curves No Random, No Bias 120 150 solves
Elliptic Curves Edwards Goes Degenerate 100 157 solves
Mathematics Size and Basis 15 1792 solves
Mathematics Gaussian Reduction 50 1097 solves
Mathematics Find the Lattice 100 594 solves
Mathematics Vectors 10 1871 solves
Mathematics Backpack Cryptography 120 357 solves
Mathematics Gram Schmidt 30 1205 solves
Mathematics What's a Lattice? 40 1327 solves
Mathematics Unencryptable 125 423 solves
Misc Too Many Errors 100 172 solves
Symmetric Ciphers Forbidden Fruit 150 221 solves
Hash Functions Collider 50 590 solves
 


Least Solved
CategoryChallengePointsSolves
Misc LFSR Destroyer 250 39 solves
Misc Bruce Schneier's Password: Part 2 250 65 solves
Hash Functions Invariant 250 84 solves
Diffie-Hellman The Matrix Revolutions 125 94 solves
Misc Trust Games 150 112 solves
Misc Jeff's LFSR 150 119 solves
Misc L-Win 120 130 solves
Mathematics Roll your Own 125 134 solves
Elliptic Curves Double and Broken 50 134 solves
RSA Let's Decrypt Again 175 135 solves
Diffie-Hellman The Matrix Reloaded 100 141 solves
Hash Functions Twin Keys 100 148 solves
Elliptic Curves No Random, No Bias 120 150 solves
Symmetric Ciphers Dancing Queen 120 151 solves
Elliptic Curves Edwards Goes Degenerate 100 157 solves
Symmetric Ciphers Oh SNAP 120 161 solves
Misc Nothing Up My Sleeve 150 164 solves
Hash Functions Mixed Up 120 170 solves
Hash Functions No Difference 175 171 solves
Misc Too Many Errors 100 172 solves
Misc Bruce Schneier's Password 100 190 solves
Hash Functions PriMeD5 100 198 solves
Diffie-Hellman The Matrix 75 200 solves
Elliptic Curves Montgomery's Ladder 40 207 solves
Misc Toshi's Treasure 150 210 solves

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