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 JSON in JSON 40 417 solves
Block Ciphers Oh SNAP 120 82 solves
Misc L-Win 120 68 solves
Misc Bruce Schneier's Password: Part 2 250 33 solves
Misc Bruce Schneier's Password 100 101 solves
Misc Mixed Up 120 80 solves
Crypto on the Web RSA or HMAC? 35 519 solves
Crypto on the Web JWT Secrets 25 680 solves
Crypto on the Web No Way JOSE 20 739 solves
Mathematics Jack's Birthday Hash 20 461 solves
Mathematics Jack's Birthday Confusion 30 462 solves
Crypto on the Web Token Appreciation 5 1128 solves
Crypto on the Web JWT Sessions 10 921 solves
Mathematics Cofactor Cofantasy 150 132 solves
Block Ciphers Logon Zero 80 169 solves
RSA RSA Backdoor Viability 175 201 solves
Misc Jeff's LFSR 150 72 solves
General Transparency 50 1227 solves
RSA Let's Decrypt Again 175 96 solves
Misc Twin Keys 100 93 solves
Misc Invariant 250 59 solves
Misc No Difference 175 97 solves
Misc Trust Games 150 78 solves
Misc PriMeD5 100 119 solves
Mathematics Ellipse Curve Cryptography 125 162 solves
RSA Let's Decrypt 80 195 solves
Elliptic Curves No Random, No Bias 120 99 solves
Elliptic Curves Edwards Goes Degenerate 100 101 solves
Mathematics Size and Basis 15 1227 solves
Mathematics Gaussian Reduction 50 727 solves
Mathematics Find the Lattice 100 386 solves
Mathematics Vectors 10 1271 solves
Mathematics Backpack Cryptography 120 235 solves
Mathematics Gram Schmidt 30 806 solves
Mathematics What's a Lattice? 40 886 solves
Mathematics Unencryptable 125 285 solves
Misc Too Many Errors 100 118 solves
Block Ciphers Forbidden Fruit 150 153 solves
Misc Collider 50 383 solves
Misc MD0 80 218 solves
Block Ciphers Triple DES 60 259 solves
Mathematics Modular Square Root 35 1208 solves
Mathematics Broken RSA 100 412 solves
Mathematics Real Eisenstein 150 169 solves
Block Ciphers Keyed Permutations 5 2166 solves
Block Ciphers Structure of AES 15 1462 solves
Block Ciphers Round Keys 20 1311 solves
Block Ciphers Resisting Bruteforce 10 1974 solves
Block Ciphers Confusion through Substitution 25 1131 solves
Block Ciphers Bringing It All Together 50 797 solves
 


Least Solved
CategoryChallengePointsSolves
Misc Bruce Schneier's Password: Part 2 250 33 solves
Misc Invariant 250 59 solves
Misc L-Win 120 68 solves
Misc Jeff's LFSR 150 72 solves
Misc Trust Games 150 78 solves
Misc Mixed Up 120 80 solves
Block Ciphers Oh SNAP 120 82 solves
Misc Twin Keys 100 93 solves
RSA Let's Decrypt Again 175 96 solves
Misc No Difference 175 97 solves
Elliptic Curves No Random, No Bias 120 99 solves
Elliptic Curves Edwards Goes Degenerate 100 101 solves
Misc Bruce Schneier's Password 100 101 solves
Misc Too Many Errors 100 118 solves
Misc PriMeD5 100 119 solves
Misc Nothing Up My Sleeve 150 120 solves
Mathematics Cofactor Cofantasy 150 132 solves
Misc Toshi's Treasure 150 149 solves
Block Ciphers Forbidden Fruit 150 153 solves
Mathematics Ellipse Curve Cryptography 125 162 solves
Misc Bit by Bit 100 168 solves
Elliptic Curves Moving Problems 150 168 solves
Mathematics Real Eisenstein 150 169 solves
Block Ciphers Logon Zero 80 169 solves
Elliptic Curves ProSign 3 100 176 solves

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