pki digital signature

This article mainly discusses cryptography and digital signature, and how it is used in Java. The partner who is interested in cryptography is recommended to see Bruce Schneier's book: Applied Crypotography. There has been a great improvement in security in the release of jdk1.5, as well as direct support for RSA algorithms, and now we're going to solve the problem from the example (this article is just a b

9.5.3 Digital Signature principledigital signatures are a way to ensure data integrity and originality. A digital signature can provide strong evidence that the data has not changed since the data was signed, and that it can confirm the identity of the person or entity that signed the data.

x509EncodedKeySpec = new X509EncodedKeySpec(keyBytes); KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM); Key publicKey = keyFactory.generatePublic(x509EncodedKeySpec); //对数据解密 Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm()); cipher.init(Cipher.ENCRYPT_MODE, publicKey); return cipher.doFinal(data);}Private key encryption /** * Decrypts with public key * @param data encryption * @param key key * @return * @throws Exception */public static byte[] Decrypt

Public key* @param data encryption* @param key key* @return* @throws Exception*/public static byte[] Decryptbypublickey (byte[] data,string key) throws exception{Decrypt the private keybyte[] keybytes = decryptBASE64 (key);X509encodedkeyspec X509encodedkeyspec = new X509encodedkeyspec (keybytes);Keyfactory keyfactory = keyfactory.getinstance (key_algorthm);Key PublicKey = Keyfactory.generatepublic (X509encodedkeyspec);Decryption of dataCipher Cipher = cipher.getinstance (Keyfactory.getalgorithm

Original address: an example of Java digital signature based on RSA algorithmFirst, preface:Network data security includes the security of the data itself, the integrity of the data (to prevent tampering), the non-repudiation of the data source, and other elements. Encryption algorithm for data encryption can ensure the security of the data itself, the use of Message digest can guarantee the integrity of th

; Vfs:tfilestream; vstr:string; Begin Result: =-1; Vstr:= '; Try vfs:= tfilestream.create (Fvfilename, Fmopenread); Open in read mode Vfs.position:= Fvhexdz; Set Start position Vfs.readbuffer (Vbuffer, SizeOf (Vbuffer)); Read data to Buffer For vint:=0 to 3 do Vstr:=inttohex (Vbuffer[vint], 2) + vstr; Get 16 in. result:= strtoint (' $ ' +vstr); Except Result: =-1 End; Vfs.free; End Procedure Tform1.button1click (Sender:tobject); Begin Self.close; End Procedure Tform1.button

This article mainly explains the contents of the APK digital signature, and introduces the way of the APK debug mode and the digital signature in the release mode. This article transferred from: http://www.jizhuomi.com/android/environment/293.html 1. What is a digital

Java digital signature algorithm-RSA Signature features: Security Anti-denial Digital Signature: a message digest algorithm with a key (Public Key and private key). The algorithm uses the private key for signature and public k

intercepted or accessed by anyone other than the recipient. By using Outlook Express's "Digital logo", you can prove your identity in electronic transactions, just as if you had to present a valid credential when paying a check. You can also use digital identifiers to encrypt messages to protect your privacy. The digital logo is combined with the S/MIME specific

Referring to RSA, you will think of public key, private key, encryption, decryption, digital signature, digital envelope ... But perhaps everyone and I have, some of the understanding of which there are misunderstandings, recently looked at the RSA RFC 2313 document, coupled with some of their own tests, finally cleared up some of these relationships, mainly incl

1. What is a digital signature? A digital signature is used to mark your program as your own identity. When someone else sees the signature, they will know that it is related to you. 2. Why do I need a digital

Introduction: When it comes to signatures, everyone is familiar with it. As we all know, signatures are generally required for major files to ensure their authenticity and effectiveness. Some important contracts, such as the house purchase contract, must be stamped with the "Seam seal". This seam seal is the seal stamped in the middle of two pages, which also represents the signature, it is used to guarantee the integrity of your contract. Therefore,

Bob has a public and private key. Bob's public key is public and can be obtained by anyone. But only Bob has his own private key. Both the public key and the private key can be used to encrypt the information separately, and the encrypted information can be decrypted with the other key accordingly. For example, when Susan encrypts information with Bob's public key, she sends it to Bob. Bob gets the message, decrypts it with his private key, and obtains Susan's information. Other people, even i

graphic Commentary: What is digital signatureIntroduction to digital signatures by David YoudPrefaceRecently in the Internet Browsing SSL protocol encryption related articles, the more sense of "digital signature" produced a little confusion. Search directly for "What is digital