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? 35 100 solves
Crypto on the Web JWT Secrets 25 116 solves
Crypto on the Web No Way JOSE 20 123 solves
Mathematics Jack's Birthday Hash 20 74 solves
Mathematics Jack's Birthday Confusion 30 91 solves
Crypto on the Web Token Appreciation 5 175 solves
Crypto on the Web JWT Sessions 10 141 solves
Mathematics Cofactor Cofantasy 200 31 solves
Block Ciphers Logon Zero 80 49 solves
RSA RSA Backdoor Viability 175 22 solves
Misc Jeff's LFSR 150 19 solves
General Transparency 50 379 solves
RSA Let's Decrypt Again 175 43 solves
Misc Twin Keys 100 38 solves
Misc Invariant 250 28 solves
Misc No Difference 175 39 solves
Misc Trust Games 150 38 solves
Misc PriMeD5 100 67 solves
Mathematics Ellipse Curve Cryptography 125 66 solves
RSA Let's Decrypt 80 89 solves
Elliptic Curves No Random, No Bias 120 51 solves
Elliptic Curves Edwards Goes Degenerate 100 42 solves
Mathematics Size and Basis 15 606 solves
Mathematics Gaussian Reduction 50 366 solves
Mathematics Find the Lattice 100 198 solves
Mathematics Vectors 10 627 solves
Mathematics Backpack Cryptography 120 120 solves
Mathematics Gram Schmidt 30 396 solves
Mathematics What's a Lattice? 40 433 solves
Mathematics Unencryptable 125 138 solves
Misc Too Many Errors 100 79 solves
Block Ciphers Forbidden Fruit 150 88 solves
Misc Collider 50 207 solves
Misc MD0 80 115 solves
Block Ciphers Triple DES 60 135 solves
Mathematics Modular Square Root 35 671 solves
Mathematics Broken RSA 100 239 solves
Mathematics Real Eisenstein 150 92 solves
Block Ciphers Keyed Permutations 5 1078 solves
Block Ciphers Structure of AES 15 758 solves
Block Ciphers Round Keys 20 697 solves
Block Ciphers Resisting Bruteforce 10 989 solves
Block Ciphers Confusion through Substitution 25 607 solves
Block Ciphers Bringing It All Together 50 430 solves
Block Ciphers Diffusion through Permutation 30 549 solves
RSA Bespoke Padding 100 144 solves
Misc Nothing Up My Sleeve 150 82 solves
Elliptic Curves Moving Problems 150 97 solves
Block Ciphers Paper Plane 120 131 solves
Mathematics Prime and Prejudice 200 109 solves
 


Least Solved
CategoryChallengePointsSolves
Misc Jeff's LFSR 150 19 solves
RSA RSA Backdoor Viability 175 22 solves
Misc Invariant 250 28 solves
Mathematics Cofactor Cofantasy 200 31 solves
Misc Twin Keys 100 38 solves
Misc Trust Games 150 38 solves
Misc No Difference 175 39 solves
Elliptic Curves Edwards Goes Degenerate 100 42 solves
RSA Let's Decrypt Again 175 43 solves
Block Ciphers Logon Zero 80 49 solves
Elliptic Curves No Random, No Bias 120 51 solves
Mathematics Ellipse Curve Cryptography 125 66 solves
Misc PriMeD5 100 67 solves
Mathematics Jack's Birthday Hash 20 74 solves
Misc Too Many Errors 100 79 solves
Misc Nothing Up My Sleeve 150 82 solves
Block Ciphers Forbidden Fruit 150 88 solves
RSA Let's Decrypt 80 89 solves
Mathematics Jack's Birthday Confusion 30 91 solves
Mathematics Real Eisenstein 150 92 solves
Elliptic Curves Moving Problems 150 97 solves
Crypto on the Web RSA or HMAC? 35 100 solves
Misc Toshi's Treasure 150 108 solves
Mathematics Prime and Prejudice 200 109 solves
Elliptic Curves Elliptic Nodes 150 111 solves

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