cryptography

问题 As I understand it: to check the validity of a JWT created using an asymmetric public/private key encryption algorithm, you require the public key along with the JWT header, claim (aka payload) and signature. The JWT header and claim can be decoded freely but can't be verified without the public key to validate the signature with (which is based on the header & claim and created with the private key). My question is, why not just bundle the public key into the claim payload of the token. That

问题 As I understand it: to check the validity of a JWT created using an asymmetric public/private key encryption algorithm, you require the public key along with the JWT header, claim (aka payload) and signature. The JWT header and claim can be decoded freely but can't be verified without the public key to validate the signature with (which is based on the header & claim and created with the private key). My question is, why not just bundle the public key into the claim payload of the token. That

问题 Is there some way to enumerate all of the elliptic curve names that can be given to the ECGenParameterSpec constructor? Or do you have to just throw a big list of curve names at the wall and see which ones do or don't throw execeptions when you try to use them? 回答1: It depends very much on the provider you want to use. As stated by user69513, you'll want to consult the documentation. And there lies the most basic of problems. For the SunEC provider, the documentation is nowhere to be found,

问题 I'm a beginner to ECC crypto programming. Does any one explain to me the difference with using ECDH for shared key exchange and use of ECIES by encrypting shared key with the public key of the receiver ? I'm feeling that ECIES could also provide me secure key exchange as long as the private key is kept secret. Thank you. 回答1: ECDH is a shared-secret derivation protocol. Two parties use knowledge of their own "private key" and their partner's "public key" to generate a shared secret. Generally

问题 I am trying to write a Lua library for Amazon SES that will allow me to send API requests. I've poured over the documentation and various examples but I am continuing to get the following error: The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details. One of my functions somewhere along the line is formatting data incorrectly or doing something to cause the end result of

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . Improve this question I swear, this seems to be changing every time I check the MSDN documentation. When I coded my executable Microsoft was suggesting to use RtlGenRandom API to generate cryptographically strong random numbers. Now when I'm checking documentation for RtlGenRandom

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 2 years ago . Improve this question I swear, this seems to be changing every time I check the MSDN documentation. When I coded my executable Microsoft was suggesting to use RtlGenRandom API to generate cryptographically strong random numbers. Now when I'm checking documentation for RtlGenRandom

问题 I am doing a hacking challenge from Hack This Site in which I found a password hash and then cracked it by brute forcing possibilities. The format that my hash cracker (John the Ripper) used was something called "FreeBSD MD5". The password and hash are the following: PW: shadow HASH: $1$AAODv...$gXPqGkIO3Cu6dnclE/sok1 My question is, doesn't MD5 normally only have the charset 0123456789abcdef (hexadecimal)? Why is this hash suddenly including a bunch of other characters? Screenshot: 回答1: This

问题 I am doing a hacking challenge from Hack This Site in which I found a password hash and then cracked it by brute forcing possibilities. The format that my hash cracker (John the Ripper) used was something called "FreeBSD MD5". The password and hash are the following: PW: shadow HASH: $1$AAODv...$gXPqGkIO3Cu6dnclE/sok1 My question is, doesn't MD5 normally only have the charset 0123456789abcdef (hexadecimal)? Why is this hash suddenly including a bunch of other characters? Screenshot: 回答1: This

问题 I am doing a hacking challenge from Hack This Site in which I found a password hash and then cracked it by brute forcing possibilities. The format that my hash cracker (John the Ripper) used was something called "FreeBSD MD5". The password and hash are the following: PW: shadow HASH: $1$AAODv...$gXPqGkIO3Cu6dnclE/sok1 My question is, doesn't MD5 normally only have the charset 0123456789abcdef (hexadecimal)? Why is this hash suddenly including a bunch of other characters? Screenshot: 回答1: This