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 40 313 solves
Block Ciphers Oh SNAP 120 60 solves
Misc L-Win 120 50 solves
Misc Bruce Schneier's Password: Part 2 250 23 solves
Misc Bruce Schneier's Password 100 81 solves
Misc Mixed Up 120 61 solves
Crypto on the Web RSA or HMAC? 35 431 solves
Crypto on the Web JWT Secrets 25 566 solves
Crypto on the Web No Way JOSE 20 617 solves
Mathematics Jack's Birthday Hash 20 360 solves
Mathematics Jack's Birthday Confusion 30 364 solves
Crypto on the Web Token Appreciation 5 902 solves
Crypto on the Web JWT Sessions 10 747 solves
Mathematics Cofactor Cofantasy 150 108 solves
Block Ciphers Logon Zero 80 144 solves
RSA RSA Backdoor Viability 175 150 solves
Misc Jeff's LFSR 150 55 solves
General Transparency 50 1023 solves
RSA Let's Decrypt Again 175 85 solves
Misc Twin Keys 100 78 solves
Misc Invariant 250 52 solves
Misc No Difference 175 85 solves
Misc Trust Games 150 67 solves
Misc PriMeD5 100 104 solves
Mathematics Ellipse Curve Cryptography 125 133 solves
RSA Let's Decrypt 80 171 solves
Elliptic Curves No Random, No Bias 120 82 solves
Elliptic Curves Edwards Goes Degenerate 100 90 solves
Mathematics Size and Basis 15 1047 solves
Mathematics Gaussian Reduction 50 623 solves
Mathematics Find the Lattice 100 335 solves
Mathematics Vectors 10 1091 solves
Mathematics Backpack Cryptography 120 198 solves
Mathematics Gram Schmidt 30 687 solves
Mathematics What's a Lattice? 40 758 solves
Mathematics Unencryptable 125 241 solves
Misc Too Many Errors 100 110 solves
Block Ciphers Forbidden Fruit 150 132 solves
Misc Collider 50 333 solves
Misc MD0 80 189 solves
Block Ciphers Triple DES 60 215 solves
Mathematics Modular Square Root 35 1056 solves
Mathematics Broken RSA 100 368 solves
Mathematics Real Eisenstein 150 142 solves
Block Ciphers Keyed Permutations 5 1875 solves
Block Ciphers Structure of AES 15 1289 solves
Block Ciphers Round Keys 20 1160 solves
Block Ciphers Resisting Bruteforce 10 1708 solves
Block Ciphers Confusion through Substitution 25 995 solves
Block Ciphers Bringing It All Together 50 705 solves
 


Least Solved
CategoryChallengePointsSolves
Misc Bruce Schneier's Password: Part 2 250 23 solves
Misc L-Win 120 50 solves
Misc Invariant 250 52 solves
Misc Jeff's LFSR 150 55 solves
Block Ciphers Oh SNAP 120 60 solves
Misc Mixed Up 120 61 solves
Misc Trust Games 150 67 solves
Misc Twin Keys 100 78 solves
Misc Bruce Schneier's Password 100 81 solves
Elliptic Curves No Random, No Bias 120 82 solves
Misc No Difference 175 85 solves
RSA Let's Decrypt Again 175 85 solves
Elliptic Curves Edwards Goes Degenerate 100 90 solves
Misc PriMeD5 100 104 solves
Mathematics Cofactor Cofantasy 150 108 solves
Misc Nothing Up My Sleeve 150 109 solves
Misc Too Many Errors 100 110 solves
Block Ciphers Forbidden Fruit 150 132 solves
Mathematics Ellipse Curve Cryptography 125 133 solves
Misc Toshi's Treasure 150 138 solves
Mathematics Real Eisenstein 150 142 solves
Block Ciphers Logon Zero 80 144 solves
Elliptic Curves Moving Problems 150 146 solves
RSA RSA Backdoor Viability 175 150 solves
Elliptic Curves ProSign 3 100 155 solves

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