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asked on
Digital Signature in Application.
Hi Fellow,
I need some urgent assistance from your side regarding digital signature,
I am a bit confuse about this concept, i had covered the theory on the Digital Sign.
Now i need some real facts about digital signature , public and private key,
My First Confusion is:
Who will generate Public and private key in the application, i means if i will add a new user in the application then who and how the Public and the private key of that user will be generated.
Second :
What will be the length of the Public and the private key( in digits) i know the key will be generated of 512,1024 bits ,but what will be the human readable lenght on the Keys, whether the keys will be in Numeric form or in Alpha Numeric for or in Hexa Decimal form,
Third confusion is:
Can we change the public ,private key of the user , then how will be encrypt/decrypt the documents.
Will the change in the keys will change the digtal signature.
forth confusion
core difference between electronic and digital signature.
Please while answering all the above queries, keep one thing in mind that i am fully aware of SHA, RSa, DES, IDEA.
please do not send any link just send me the description of the Above Questions.
I need some urgent assistance from your side regarding digital signature,
I am a bit confuse about this concept, i had covered the theory on the Digital Sign.
Now i need some real facts about digital signature , public and private key,
My First Confusion is:
Who will generate Public and private key in the application, i means if i will add a new user in the application then who and how the Public and the private key of that user will be generated.
Second :
What will be the length of the Public and the private key( in digits) i know the key will be generated of 512,1024 bits ,but what will be the human readable lenght on the Keys, whether the keys will be in Numeric form or in Alpha Numeric for or in Hexa Decimal form,
Third confusion is:
Can we change the public ,private key of the user , then how will be encrypt/decrypt the documents.
Will the change in the keys will change the digtal signature.
forth confusion
core difference between electronic and digital signature.
Please while answering all the above queries, keep one thing in mind that i am fully aware of SHA, RSa, DES, IDEA.
please do not send any link just send me the description of the Above Questions.
ASKER CERTIFIED SOLUTION
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oh, those keys are going to be HUGE. Length is really up to you, but realize that the smaller it is, the more likely it is to break it and fake messages. Thats the whole point of how the current Public Key/Private key system works. Anyone could really find the key mathematically, it would just take TOO long with a large enough keys. Some people feel safe with 1024 other feel safe with 4096.
http://triade.studentenweb.org/
Click on Gint on the left.
Download PrimeGenerator and RSA.zip. Thats the basics of ONE type of Public Key/Private Key system.
1024 bit public key looks like:
mQCNAzED7QIAAAEEALsDjYnebi
conbVColTNPxuv4eW1RqjyZncM
kCbo9KvN/9idqhgKAH0SXXBA/w
tCJFdWdlbmUgTWFoIDxldWdlbm
b1Qfl3n9AQGTTgP/XLI3guJ7ET
h1vtj4nLO45EUanTlF6obEBI2q
ehtC/wW+p/EcWZG1O3a12nmCOP
BRAz9G4eonfj1uN6FZEBAWQgB/
g2vT0MkwbSrj4VERrG5qXHJpG9
jbqPUZOvYhGglDHA7XyOeWOVic
TyfkkzTzIZeyLoEXcNKt/2ClFG
V34cPNKuMWpRTPmYbn8HQ3mcf6
gFRBNbyUzejNg0Ac4lX8FzS+5/
CC8xk5P0EQK/fwCcDlGhsDOmUu
UQponkfYtCBFdWdlbmUgTWFoID
U83CW29UH5d5/QEB1gED/i5a5r
0Fvya9m/aLf0iCsVg19gtemRjF
yBbV9dwYAGOT6qFwVmbUAmYxm7
tClFdWdlbmUgTWFoIDxldWdlbm
EDED7QLCW29UH5d5/QEB4fMEAI
uRUoR3Rw3EfzwH+OEi+zEsuwTr
HGg4V8q/dwBsqKnv8/M/RfmN/F
Kq6S
=dFWx
4096 would look like:
mQGiBDR587IRBADNI1BT915343
zbvmm7eXE7ttq7FDIpd+rYXN5r
fo9Yb9zkbvJAyx4qx7N9xm7U2n
t4R8lLU0S0ulgVP4RV41gdUEAI
nXqLk0oOOi0agOeoGgcGuwDC/r
DCdwprAT7/mdVlzKVhiUzfxpiy
VKbmA/0apR/aJsagzPJR2vl06R
IiqsiubzfYQnBQmeJpYnIYXd55
cR0RFCAMX0GiebcAxLPeSPOeYa
aCA8ZXVnZW5lbUBpeC5uZXRjb2
EBwACC8xk5P0Rs0AoNadd4dXps
KfIuPIdhWYkAlQMFEDR589rCW2
Nciep8fAgEWywWReEAQUmKr/gX
EiF627qLEiqE8pYi7eRJ4Ig3/H
DLhB9pNFKwMmiFXNYwotiQEVAw
mfHDLLj51u+gZhmdSsFu9VOJV+
hXtG5dBcc9aWk4Dhdoec3lPTGv
DyL+oARoLMKVI9mAOXi6LSE2eN
uV2MmgVeLv9fCd0BGbY09LvA6O
1SoUtY1S8Nf0g4BkyvCQ7EWNsU
Uo9lauT4fLkEDQQ0efPFEBAA+R
egus5D/jRpS2MEpT13wCFkiAtR
2FDKIldDKb6V6FYrOHhcC9v4TE
CMbMHXdXJDhK4sTw6I4TZ5dOkh
Q2DD4+jWCv2hKCYLrqmus2UPog
Qi0CNsEmy2henXyYCQqNfi3t5F
8wXo+VMROU+28W65Szgg2gGnVq
01D49Vlf3HZSTz09jdvOmeFXkl
qtNbno2gpXI61Brwv0YAWCvl9I
jvbzySPAQ/ClWxiNjrtVjLhdON
CnLWhsQDGcgHKXrKlQzZlp+r0A
1hcAAgIQAOHMD6KXb14do3uOWC
R1OBjflHvaieeUSQeyrrf3p7ko
wbtL0CaiwhaMUOImMnsVFi4EcK
li6c9SmYZMafEAXO89ECZ3e0ke
CGDxnyGgNGIys9jrujHVrYmfTp
YJhe0ARZ9y4FFk+pUljuwqU5OD
aHAa6EaePrAW0xPnNDk4wV35zb
QkHCG9xbaEURgCjN/dL7JUeH+N
l+wx3knFZb9TT5uVDCcYwVyhqO
ew4ypeCnHwHJ035lSiYX07G/6Y
qDTAq/tUL9GuH2t6/89I1M6IjR
xhwACC8xk5P0EQIdWgCg/nblTF
iCZE+04VlDEK
=g1X4
http://triade.studentenweb.org/
Click on Gint on the left.
Download PrimeGenerator and RSA.zip. Thats the basics of ONE type of Public Key/Private Key system.
1024 bit public key looks like:
mQCNAzED7QIAAAEEALsDjYnebi
conbVColTNPxuv4eW1RqjyZncM
kCbo9KvN/9idqhgKAH0SXXBA/w
tCJFdWdlbmUgTWFoIDxldWdlbm
b1Qfl3n9AQGTTgP/XLI3guJ7ET
h1vtj4nLO45EUanTlF6obEBI2q
ehtC/wW+p/EcWZG1O3a12nmCOP
BRAz9G4eonfj1uN6FZEBAWQgB/
g2vT0MkwbSrj4VERrG5qXHJpG9
jbqPUZOvYhGglDHA7XyOeWOVic
TyfkkzTzIZeyLoEXcNKt/2ClFG
V34cPNKuMWpRTPmYbn8HQ3mcf6
gFRBNbyUzejNg0Ac4lX8FzS+5/
CC8xk5P0EQK/fwCcDlGhsDOmUu
UQponkfYtCBFdWdlbmUgTWFoID
U83CW29UH5d5/QEB1gED/i5a5r
0Fvya9m/aLf0iCsVg19gtemRjF
yBbV9dwYAGOT6qFwVmbUAmYxm7
tClFdWdlbmUgTWFoIDxldWdlbm
EDED7QLCW29UH5d5/QEB4fMEAI
uRUoR3Rw3EfzwH+OEi+zEsuwTr
HGg4V8q/dwBsqKnv8/M/RfmN/F
Kq6S
=dFWx
4096 would look like:
mQGiBDR587IRBADNI1BT915343
zbvmm7eXE7ttq7FDIpd+rYXN5r
fo9Yb9zkbvJAyx4qx7N9xm7U2n
t4R8lLU0S0ulgVP4RV41gdUEAI
nXqLk0oOOi0agOeoGgcGuwDC/r
DCdwprAT7/mdVlzKVhiUzfxpiy
VKbmA/0apR/aJsagzPJR2vl06R
IiqsiubzfYQnBQmeJpYnIYXd55
cR0RFCAMX0GiebcAxLPeSPOeYa
aCA8ZXVnZW5lbUBpeC5uZXRjb2
EBwACC8xk5P0Rs0AoNadd4dXps
KfIuPIdhWYkAlQMFEDR589rCW2
Nciep8fAgEWywWReEAQUmKr/gX
EiF627qLEiqE8pYi7eRJ4Ig3/H
DLhB9pNFKwMmiFXNYwotiQEVAw
mfHDLLj51u+gZhmdSsFu9VOJV+
hXtG5dBcc9aWk4Dhdoec3lPTGv
DyL+oARoLMKVI9mAOXi6LSE2eN
uV2MmgVeLv9fCd0BGbY09LvA6O
1SoUtY1S8Nf0g4BkyvCQ7EWNsU
Uo9lauT4fLkEDQQ0efPFEBAA+R
egus5D/jRpS2MEpT13wCFkiAtR
2FDKIldDKb6V6FYrOHhcC9v4TE
CMbMHXdXJDhK4sTw6I4TZ5dOkh
Q2DD4+jWCv2hKCYLrqmus2UPog
Qi0CNsEmy2henXyYCQqNfi3t5F
8wXo+VMROU+28W65Szgg2gGnVq
01D49Vlf3HZSTz09jdvOmeFXkl
qtNbno2gpXI61Brwv0YAWCvl9I
jvbzySPAQ/ClWxiNjrtVjLhdON
CnLWhsQDGcgHKXrKlQzZlp+r0A
1hcAAgIQAOHMD6KXb14do3uOWC
R1OBjflHvaieeUSQeyrrf3p7ko
wbtL0CaiwhaMUOImMnsVFi4EcK
li6c9SmYZMafEAXO89ECZ3e0ke
CGDxnyGgNGIys9jrujHVrYmfTp
YJhe0ARZ9y4FFk+pUljuwqU5OD
aHAa6EaePrAW0xPnNDk4wV35zb
QkHCG9xbaEURgCjN/dL7JUeH+N
l+wx3knFZb9TT5uVDCcYwVyhqO
ew4ypeCnHwHJ035lSiYX07G/6Y
qDTAq/tUL9GuH2t6/89I1M6IjR
xhwACC8xk5P0EQIdWgCg/nblTF
iCZE+04VlDEK
=g1X4
ASKER
From Human readable length i means what will be the length of the Public and teh Private Key,
Is Public key is some thing like 395448548 ???
What is the minimum length we can assign to the Public key and the private key,
and the last one what algo we need to use to generate own public key,
What i feel right now we will take 2 prime no. and then use it to generate primary key ???is it so?????