What does 15,360 bits look like?

According to NIST's guidelines, it takes a 15,360-bit RSA or Diffie-Hellman key to provide the same level of cryptographic strength as a 256-bit AES key.

What does a 15,360-bit key look like?

A 15,360-bit number has about 4,624 decimal digits. Here's what a number with 4,624 decimal digits looks like. It's big. Doing public-key operations with numbers that big is slow.

Don't use them unless you absolutely have to.

94598000209149914523662835549475089923370892004800021803369459826940368587029734135
53140333404205082341000224410481949851574795432979265755760040881222220641300023125
50737421110002040128607469796644894392870725815000246360649329165053448440219525634
36517708207207317900002561196904462645747774519243372965394595934258260527000261547
44526695270799535936783848823961011833211594660002794557285736789754387546224443191
19042592929274597300028424811621397344072116868487670307112059257014667000029235237
83177320889837689359141626252296630552282562000300449352494752463382445862510256196
27933565337124720003100549976546405188159961196389654692823912328729529000323596315
30726898093543335135462779745002490103393330003359808083914542726842836094970013021
24892785652010600034460588523601390922867728144077939108364770617429410003532179005
97873792524105567070078674317157853941183800036692346140620117452041595660000187439
24239711896338000371956541430017587537940419215856667436806849628520700038451551493
81947607246436679454359047900332082669541000399486431994361681085134888815530154035
45605014511760004098086248264524028404449990889639094734073544131880000413318516232
41941509498943548581886954199437548730430004280951004069638270774201512338725016252
98946246117100043797524914071961282966986102591748522053900387595790004418633325379
81450657131010246740545561427779389193600045740294390277557322709779017119525275802
18081451748000465417845611809933714305335129695612719255360409032400047116644988352
07984827593817153909973334408846123356000484832477928312496471002295368703230757546
15020099940004969074941388763791976355840440110518216150184876938000500918820097328
25395270422086304833898737464278580440005190045854975198150654949388199791870761506
84766465900052731895020747677262696229064464271246701841361827600005375768764902097
18774990429122729537505871938234317800054540164405666281310030068227398207145329507
70617813000550835869910785424278513661588730461897553312230842000056283060326481333
10591405100789332604604759411901840000575384086233815941362851215902902846668795777
62207910005891757537416161362269502639021255781765148348347055000598941592694003975
83911260717646489497230694541374080006077513038208686429901684148277451908139807289
35550700061195023717469979202885521029773742877525165344674150006221818593139327881
75705686731560708285046318533845200063514746649968107236219404991345428360919108007
45449000649955968331625352417069777128307481978142438607283400065337134800793584728
69519266472158303298229317493972000668527486893113032297028834341377351590400711484
36430006784133896404403552166738527009161222605616232718423000685673216234173959613
11012391622854965756081604188800006965138568068764885261343136586145875210698564447
27700070380010217681719117117160292937742196404965584496980007137402963970130477586
56271100864732462605400303743800072971254034887083314172181539250752376204715501295
78000732182641134471433407264638859024913906441038565455200074731354274295719090358
57947429608789881566469119202000750763877929030611807296207441562382199538047136699
40007660528834410795419814591752069505533521396121206455000778359635655069589298305
12809719774335378392301504980007810850627469959910507134990631953075718390641019362
00079398209895243622631476442180814438000935131024731670008059580064787556978800888
35544862376806156041110840800081385080734123793487639082297022177190420795954499530
00823069270668946881612756196800918206763400054626920000083654439565918288274374963
22404108337656769629990836000842726750264131927229407477446061798548911973413035800
08591307069911907224210366995372828825357932897666252000866843494688844731362262126
98408128438259009815931460008748908158775474524591357000475483824526925413055160000
88069134519742672786011188309528630119890114974403440008910455160191421033712913423
78218832580851436677088300090128839734365027611840428501392179741507790712267690009
12177830976388073696131649420966328102023088164744900092195235951565122596598628368
25869572137981643591529000936724552670355831656379246866867646334222266559080200094
60584473770750037992451342652926760836374132644344000955385341377360669485058838738
59493647333196240436420009624637387367438489342526230799212369186010374283873000978
30801245138992228150775951777973772758551972378670009816444243343615199073274937093
98513032552548465475900099607901815757178657621116178576458195297965130048600010003
99110461937161689466083246538460958232886181916100101385559555432886597800835560860
29735477627129923853001021754673704920524621555121292815907607936279545890900103326
43528619581906831009119893676355937798086300514001046957268

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