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Php-based digital verification code and digital operation verification code, and php-based digital verification code operation This article describes the php-implemented digital verification code and the digital operation verification code. Share it with you for your referen

;}function Num2hanzi ($STR) {$numarr = Numdatabase ();$hanziarr = Hzdatabase ();Preg_match ('/[0-9]+/', $str, $t);$num = intval ($t [0]);$rstr = ";if (In_array ($num, $numarr)) {foreach ($numarr as $k = = $v) {if ($v = = $num) {$kk = $k;}}$rstr = Str_replace ($num, $hanziarr [$kk], $STR);}return $rstr;}Kanji to Digitalfunction Hanzi2num ($STR) {$numarr = Numdatabase ();$hanziarr = Hzdatabase ();foreach ($hanziarr as $k = = $v) {if (Strpos ($str, $v)!==false) {$rstr = Str_replace ($v, $numarr [$k

Android secure encryption feature article index Android Secure encryption: Symmetric encryption Android Secure encryption: Asymmetric encryption Android Secure encryption: Message digest msg Digest Android Secure encryption: Digital signatures and digital certificates Android Secure encryption: HTTPS programming All of the above learning, symmetric encryption, asymmetric encryp

Android security encryption feature article index Android Secure encryption: Symmetric encryption Android Secure encryption: Asymmetric encryption Android Secure encryption: Message digest Digest Android Security Encryption: Digital signatures and digital certificates Android Secure encryption: HTTPS programming The above learning all content, symmetric en

Preface First look at Baidu Encyclopedia of Digital Signatures and digital certificate interpretation: Digital Signature: A fixed-digit message digest is computed by the hash algorithm agreed by both parties. Mathematically guaranteed: As long as any one of the changes in the message, the recalculated report digest to the value will not match the original value.

Turn from: HTTPS Unidirectional authentication Instructions _ digital certificate, digital signature, SSL (TLS), SASLBecause TLS + SASL is used in the project to do the security authentication layer. So read some online information, here to do a summary.1. First recommend several articles:Digital certificate: http://www.cnblogs.com/hyddd/archive/2009/01/07/1371292.htmlDigital certificates and ssl:http://www

Http://www.cnblogs.com/1-2-3/archive/2007/09/17/colloquialism-digital-certificate-part1.htmlSummaryThis series is easy to read, so you can understand the basic principles of digital signatures and how to apply them (even if you are an enterprise boss who is not computer savvy, you can read this article). Then we step into the technical details, and finally will give a B/s information system using the

Digital Certificate and its authentication process [reprinted], digital certificate reprinted As we all know, public key cryptography makes it easy to use digital signatures, encrypted communications, and other key services by using the public key and private key pair. The reason why public key technology can be widely used is that for entities that use the publi

Direct Digital Frequency Synthesis Technology and Its Implementation of C ++, digital frequency synthesis implementation DDFS-Direct Digital Frequency Synthesizer Direct Digital Frequency synthesis technology can be used to generate periodic signals of arbitrary waveforms. The so-called DDFS is simply a look-up Table m

would tell that the message really came from someone with a private key. The process of encrypting private keys is a digital signature.Data encrypted with the public key can only be decrypted by the private key, whereas the data encrypted with the private key can only be decrypted by the public key, and it is this asymmetry that makes the public-key cipher system widely used.2.2. AdvantagesCompared with symmetric key encryption, the advantage is that

is different, and that it is guaranteed to be unique. the process is irreversible , that is, the text cannot be reversed by a digest (it seems that SHA1 can already be cracked, SHA2 has not.) Generally think that can not be cracked, or crack need to spend too much time, cost-effective low).With this feature, you can verify the integrity of the message. Message digests are typically used in digital signatures, which are described in the following dir

scanner to scan the image to the computer (W2, H2) at the scanning resolution. This allows us to successfully zoom in on the bitmap. Of course, the cost of such an approach is too high to spend more than 1000 of the ocean, and time-consuming and laborious, is a theoretically feasible but not practical approach. However, this approach is sufficient to vividly and clearly illustrate the nature and method of digital