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Level III Challenges (74)

Page 14 of the challenges in Level III, ordered by date posted (the most recent appear first).

RSA Factoring Challenge: RSA-240

[rsa-06] - 16 users already solved this challenge, 2 are working on it.
 
 
 

This challenge descends from the RSA Laboratories contest to encourage research into the practical difficulty of factoring large integers of different length (between 330 and 2048 bit) and cracking RSA keys used in cryptography. This challenge is about factoring a number with 240 decimal digits.
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-02-07 10:47
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#16) Achieved points (Global score) y-m-d - h:m:s

Snake (snk) 0 (187783) 2019-12-02 20:05:22
Kurt Gebauer (Yokozuna) 0 (282608) 2019-12-03 02:09:39
George (Theofanidis) 0 (130187) 2019-12-15 22:40:32
Antares (Antares) 0 (32880) 2020-03-02 11:00:19
#5 Erik (Erox) 0 (26141) 2020-03-17 16:26:56
#6 simone (xseris) 0 (8632) 2020-04-14 09:46:01
#7 D3d4lu5 (D3d4lu5) 0 (363488) 2020-05-06 18:08:05
#8 Alain Collignon (vexilla72) 0 (123666) 2020-07-09 07:54:58
#9 0bliviate (0bliviate) 0 (8634) 2020-08-17 19:24:05
#10 George Lasry (george4096) 0 (399565) 2020-09-06 12:15:26
#11 Kevin Shepherd (kshepherd) 0 (2391) 2020-09-14 06:14:02
#12 Alexander W. Janssen (itnomad) 0 (10782) 2021-02-10 16:57:04
#13 Gerd Wilts (gerdw) 0 (50634) 2021-02-15 20:30:27
#14 gordon (sir5) 0 (16181) 2021-05-12 19:59:29
#15 Eric (ExAstris) 0 (56037) 2021-05-13 03:07:15
The solution for this challenge was made public on 2019-12-02, and thus it is not possible to get points for this challenge any more. However, you can still solve and enter a solution for this challenge.
You must be logged in to solve the challenge


RSA Factoring Challenge: RSA-232

[rsa-05] - 14 users already solved this challenge, 2 are working on it.
 
 
 

This challenge descends from the RSA Laboratories contest to encourage research into the practical difficulty of factoring large integers of different length (between 330 and 2048 bit) and cracking RSA keys used in cryptography. This challenge is about factoring a number with 232 decimal digits.
Read more...

Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2012-02-07 10:45
Maximum number of attempts for this challenge: 15

All successful users of this challenge

Rank User (#14) Achieved points (Global score) y-m-d - h:m:s

George (Theofanidis) 0 (130187) 2020-03-12 21:24:12
Erik (Erox) 0 (26141) 2020-03-17 16:25:27
Snake (snk) 0 (187783) 2020-03-25 13:36:58
simone (xseris) 0 (8632) 2020-04-14 09:43:45
#5 D3d4lu5 (D3d4lu5) 0 (363488) 2020-05-06 18:09:25
#6 Alain Collignon (vexilla72) 0 (123666) 2020-07-09 07:48:17
#7 0bliviate (0bliviate) 0 (8634) 2020-08-17 19:30:58
#8 George Lasry (george4096) 0 (399565) 2020-09-06 12:13:09
#9 Kevin Shepherd (kshepherd) 0 (2391) 2020-09-14 06:16:27
#10 Alexander W. Janssen (itnomad) 0 (10782) 2021-02-10 17:02:54
#11 Gerd Wilts (gerdw) 0 (50634) 2021-02-15 20:33:29
#12 gordon (sir5) 0 (16181) 2021-05-12 19:57:44
#13 Eric (ExAstris) 0 (56037) 2021-05-13 03:11:30
#14 Antares (Antares) 0 (32880) 2021-07-10 16:54:04
The solution for this challenge was made public on 2020-02-17, and thus it is not possible to get points for this challenge any more. However, you can still solve and enter a solution for this challenge.
You must be logged in to solve the challenge


Digital Signatures: DSA with Medium Fields

[lange-01] - 0 users already solved this challenge, 1 is working on it.
 
 
 

This challenge concerns the Discrete Logarithm Problem (DLP) in a "medium" field.
For powers of very small primes and for large prime fields the function-field sieve and the number-field sieve are highly optimized; for intermediate fields algorithms with the same asymptotic behavior exist but the actual running times are slower. Are you able to solve the DLP in such a field anyway?
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Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-09-02 12:23
Maximum number of attempts for this challenge: 20

All successful users of this challenge

No one solved the challenge right now. Be the first!
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Substitution Cipher with Non-Prefix Codes

[muralidhar-01] - 1 user already solved this challenge, 3 are working on it.
 
 
 

Usually prefix-free codes are used for encryption because it makes the decryption process easier at the receiver's end. However, this challenge deals with a substitution cipher with non-prefix codes. This should be broken by performing a "ciphertext-only attack".
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Authors: This email address is being protected from spambots. You need JavaScript enabled to view it.,This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-06-15 11:00
Maximum number of attempts for this challenge: 20

All successful users of this challenge

Rank User (#1) Achieved points (Global score) y-m-d - h:m:s

Peter Mustermann (Gummiboot) 13959 (60285) 2013-01-14 07:53:12
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Recovering the Private Key in the Fully Homomorphic Encryption Scheme

[ramaekers-02] - 0 users already solved this challenge, 4 are working on it.
 
 
 

In the Fully Homomorphic Encryption scheme by Gentry and Halevi the private key is included in the public key. So, theoretically it is possible to recover the secret key.
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Click here to get to the corresponding forum topic to share your opinion.
Click here to download the challenge.
Click here to download the additional file of the challenge.

Author: This email address is being protected from spambots. You need JavaScript enabled to view it.
Published on: 2011-01-14 00:00
Maximum number of attempts for this challenge: 25

All successful users of this challenge

No one solved the challenge right now. Be the first!
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   +++    [01:47 - 02.08.2021] jerva solved the Level II challenge 'SIGABA CSP-2900 — Part 1'    +++    [00:40 - 02.08.2021] mochiorochi solved the Level I challenge 'Beaver Code'    +++    [22:51 - 01.08.2021] mochiorochi solved the Level I challenge 'A hidden word'    +++    [22:46 - 01.08.2021] mochiorochi solved the Level II challenge 'Letter to the Templars — Part 3'    +++    [22:05 - 01.08.2021] mochiorochi solved the Level I challenge 'Letter to the Templars — Part 2'    +++