I’m wondering if it’s possible to recover a RSA public key that I have converted to byte array previously. byte[] keyBytes = publicKey.getEncoded(); Thanks for the help. Answer PublicKey publicKey = KeyFactory.getInstance(“RSA”).generatePublic(new X509EncodedKeySpec(bytes)); For more info see this tutorial AttributionSource : Link , Question Author : kiewic , Answer Author : madth3
Here is an algorithm in Java: public String getHash(String password, String salt) throws Exception { String input = password + salt; MessageDigest md = MessageDigest.getInstance(SHA-512); byte[] out = md.digest(input.getBytes()); return HexEncoder.toHex(out); } Assume the salt is known. I want to know the time to brute force for when the password is a dictionary word and … Read more
I want to use RSA public key encryption. What is the best way to store or retrieve private and public keys? Is XML a good idea here? How to get the keys? RSAParameters privateKey = RSA.ExportParameters(true); RSAParameters publicKey = RSA.ExportParameters(false); Because RSAParameters have the following members: D, DP, DQ, Exponent, InverseQ, Modulus, P, Q Which … Read more
What are the differences between SHA1 and RSA? Are they just different algorithms or are they fundamentally (i.e. used for different things) different on some level. Answer Fundamentally different. SHA1 is a hash algorithm, which is a one way function, turning an input of any size into a fixed-length output (160 bit in this case). … Read more
Up to what string length is it possible to use MD5 as a hash without having to worry about the possibility of a collision? This would presumably be calculated by generating an MD5 hash for every possible string in a particular character set, in increasing length, until a hash appears for a second time (a … Read more
I need to hash some passwords with salt on postgresql, and I haven’t been able to find any relevant documentation on how to get that done. So how can I hash passwords (with some salts) in postgresql? Answer It’s been a while since I asked this question, and I’m much more familiar with the cryptographic … Read more
Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 9 years ago. Improve this question I was reading a few articles on salts and password hashes and a few people were mentioning rainbow attacks. What exactly is a … Read more
The following question is more complex than it may first seem. Assume that I’ve got an arbitrary JSON object, one that may contain any amount of data including other nested JSON objects. What I want is a cryptographic hash/digest of the JSON data, without regard to the actual JSON formatting itself (eg: ignoring newlines and … Read more
I recently saw the above operator in a code,I googled for it but found nothing.The code is below.Please describe what actually does this operator do? #include<stdio.h> int main() { unsigned long int i=0; char ch; char name1[20],name2[20]; FILE *fp,*ft; printf(“ENTER THE SOURCE FILE:”); gets(name1); printf(“ENTER THE DESTINATION FILE:”); gets(name2); fp=fopen(name1,”r”); ft=fopen(name2,”w”); if(fp==NULL) { printf(“CAN,T OPEN … Read more
I am staring at this for quite a while and thanks to the MSDN documentation I cannot really figure out what’s going. Basically I am loading a PFX file from the disc into a X509Certificate2 and trying to encrypt a string using the public key and decrypt using the private key. Why am I puzzled: … Read more
