【正文】 to encrypt the data. ? CryptoAPI supports both publickey and symmetric key cryptography. It includes functionality for encrypting and decrypting data and for authentication using digital certificates. It also includes a cryptographically secure pseudorandom number generator function CryptGenRandom. ? CryptoAPI works with a number of CSPs (Cryptographic Service Providers) installed on the machine. CSPs are the modules that do the actual work of encoding and decoding data by performing the cryptographic functions. Γ В CSP ? CryptoAPI works with a number of CSPs (Cryptographic Service Providers) installed on the machine. – CSPs are the modules that do the actual work of encoding and decoding data by performing the cryptographic functions. – CSP/DLL – – MS對(duì) CSP/DLL的 簽名 Γ В CAPI結(jié)構(gòu)圖 ? Γ В CAPI例子程序 ? MSDN example ? 改正了一個(gè) bug – 加密 /解密一個(gè)文件 ? 相關(guān) CAPI函數(shù) – CryptAcquireContext – CryptReleaseContext – CryptEncrypt – CryptDecrypt Γ В Cryptography API: Next Generation (CNG) ? Windows Vista features an update to the Crypto API known as Cryptography API: Next Generation (CNG). ? It has better API factoring to allow the same functions to work using a wide range of cryptographic algorithms, and the inclusion of a number of newer algorithms that are part of the National Security Agency (NSA) Suite B. ? It is also flexible, featuring support for plugging in custom cryptographic APIs into the CNG runtime. CNG works in both user and kernel mode, and also supports all of the algorithms from the CryptoAPI. ? The Microsoft provider that implements CNG is housed in . Γ В ? CNG also supports Elliptic Curve Cryptography which is also secure and uses shorter keys than RSA. The CNG API integrates with the smart card subsystem by including a Base Smart Card Cryptographic Service Provider (Base CSP) module which encapsulates the smart card API. Smart card manufacturers just have to make their devices patible with this, rather than provide a fromscratch solution. ? Γ В DPAPI: Data protection API ? DP API – a relatively easytouse cryptography API available as a standard ponent in Microsoft Windows 2023 and later versions of Windows operating systems. ? 示例程序 – 連接庫 “ ” Γ В DPAPI例子 ? main() ? { ? DATA_BLOB in, out, in2。 ? = (BYTE*)my input text as if none。 ? = strlen(my input text as if none)+1。 ? BOOL b = CryptProtectData(in, NULL, NULL, NULL, NULL, 0, out)。 ? if (b) ? { b = CryptUnprotectData(out, NULL, NULL, NULL, NULL, 0, in2)。 ? if (b) ? puts((char*)())。 ? else ? puts(err)。 ? } ? return 0。 ? } Γ В Data Execution Prevention (DEP) ? DEP – a security feature included in modern Microsoft Windows operating systems that is intended to prevent an application or service from executing code from a nonexecutable memory region. – This helps prevent certain exploits that store code via a buffer overflow, for example. – DEP was introduced in Windows XP SP2, also in Windows Server 2023 SP1 and Windows Vista. Later versions of the operating systems support this feature as well. Γ В XP：數(shù)據(jù)執(zhí)行保護(hù) ? ? multi(0)disk(0)rdisk(0)partition(1)\WINDOWS=Microsoft Windows XP Pro /noexecute=optin /fastdetect Γ В Linux中的 “DEP”, and more ? Data Execution Prevention (DEP) ? in Linux ? in CPU ? NX: No eXecute by AMD ? XD: eXecute Disable by Intel Γ В (Open) Cryptographic Libraries ? OpenSSL, NSS, POSSE, OpenSSH, GnuTLS, MatrixSSL, cryptlib, GNU Crypto, Crypto++, BeeCrypt, Cryptlib, Cryptix, LibTomCrypt, libgcrypt, MIRACL, Cryptix, borZoi, ? Try some of these Γ В Crypto in Java/JDK/JRE ? Java SE Security homepage – ? JDK 6 Securityrelated APIs Developer Guides – /security/ Γ В REF ? debian:~ aptitude search crypt | wc 80 632 6480 Γ В 推薦閱讀 /實(shí)驗(yàn)： OpenSC Γ В Q A ? 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