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RSA Laboratories

The RSA Challenge Numbers

This challenge is no longer active

The RSA Challenge numbers are the kind we believe to be the hardest to factor; these numbers should be particularly challenging. These are the kind of numbers used in devising secure RSA cryptosystems.

This page serves as an archive for the factoring challenges conducted by RSA Laboratories through 2007.

A link to each of the eight RSA challenge numbers is listed below. The numbers are designated "RSA-XXXX", where XXXX is the number's length, in bits. The values are presented as decimal strings, with the most significant digit first. Also listed are the number of digits and the decimal sum of the digits.

Each challenge number may be downloaded as an ASCII text file. The entire challenge list may be downloaded, in ASCII text format, using the link below.


Download All Challenge Numbers In Text Format


RSA-576

Status: Factored

Decimal Digits: 174

18819881292060796383869723946165043980716356337941
73827007633564229888597152346654853190606065047430
45317388011303396716199692321205734031879550656996
221305168759307650257059

Digit Sum: 785


RSA-640

Status: Factored

Decimal Digits: 193

31074182404900437213507500358885679300373460228427
27545720161948823206440518081504556346829671723286
78243791627283803341547107310850191954852900733772
4822783525742386454014691736602477652346609

Digit Sum: 806


RSA-704

Status: Not Factored

Decimal Digits: 212

74037563479561712828046796097429573142593188889231
28908493623263897276503402826627689199641962511784
39958943305021275853701189680982867331732731089309
00552505116877063299072396380786710086096962537934
650563796359

Decimal Digit Sum: 1009


RSA-768

Status: Factored

Decimal Digits: 232

12301866845301177551304949583849627207728535695953
34792197322452151726400507263657518745202199786469
38995647494277406384592519255732630345373154826850
79170261221429134616704292143116022212404792747377
94080665351419597459856902143413

Decimal Digit Sum: 1018


RSA-896

Status: Not Factored

Decimal Digits: 270

41202343698665954385553136533257594817981169984432
79828454556264338764455652484261980988704231618418
79261420247188869492560931776375033421130982397485
15094490910691026986103186270411488086697056490290
36536588674337317208131041051908642547932826013912
57624033946373269391

Decimal Digit Sum: 1222


RSA-1024

Status: Not Factored

Decimal Digits: 309

13506641086599522334960321627880596993888147560566
70275244851438515265106048595338339402871505719094
41798207282164471551373680419703964191743046496589
27425623934102086438320211037295872576235850964311
05640735015081875106765946292055636855294752135008
52879416377328533906109750544334999811150056977236
890927563

Decimal Digit Sum: 1369


RSA-1536

Status: Not Factored

Decimal Digits: 463

18476997032117414743068356202001644030185493386634
10171471785774910651696711161249859337684305435744
58561606154457179405222971773252466096064694607124
96237204420222697567566873784275623895087646784409
33285157496578843415088475528298186726451339863364
93190808467199043187438128336350279547028265329780
29349161558118810498449083195450098483937752272570
52578591944993870073695755688436933812779613089230
39256969525326162082367649031603655137144791393234
7169566988069

Decimal Digit Sum: 2153


RSA-2048

Status: Not Factored

Decimal Digits: 617

25195908475657893494027183240048398571429282126204
03202777713783604366202070759555626401852588078440
69182906412495150821892985591491761845028084891200
72844992687392807287776735971418347270261896375014
97182469116507761337985909570009733045974880842840
17974291006424586918171951187461215151726546322822
16869987549182422433637259085141865462043576798423
38718477444792073993423658482382428119816381501067
48104516603773060562016196762561338441436038339044
14952634432190114657544454178424020924616515723350
77870774981712577246796292638635637328991215483143
81678998850404453640235273819513786365643912120103
97122822120720357

Decimal Digit Sum: 2738


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