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    密文反馈模式 cfb_密码术中的密文反馈(CFB)

    This is Ciphertext feedback (CFB) which is also a mode of operation for a block cipher. In contrast to the cipher block chaining(CBC) mode, which encrypts a set number of bits of plaintext or original text at a time, it is at times desirable or sensible to encrypt and transfer or exchange some plaintext or original text values instantly one at a time, for which ciphertext feedback is a method in cryptography. Like cipher block chaining(cbc), ciphertext feedback(cfb) also makes use of an initialization vector (IV) in the blocks. CFB uses a block cipher as a component of a different or random number generator in this. CFB mode, the previous ciphertext block is encrypted and the output is XORed (see XOR) with the current plaintext or original text block to create the current ciphertext block from this. The XOR operation conceals plaintext or original text patterns. Original text or plaintext cannot be directly worked on unless there is the retrieval of blocks from either the beginning or end of the ciphertext in the cryptography.

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    ssl协议及开源实现openssl

    SSL: (Secure Socket Layer)安全套接层,ssl是一套安全协议,被应用层调用,当http调用ssl协议时被称为https,当ftp调用ssl协议时被称为sftp。 lls是一个协议的集合 ,其中包括: Handshake协议:包括协商安全参数和密码套件、服务器身份认证(客户端身份认证可选)、密钥交换 ChangeCipherSpec 协议:一条消息表明握手协议已经完成 Alert 协议:对握手协议中一些异常的错误提醒,分为fatal和warning两个级别, fatal类型错误会直接中断SSL链接,而warning级别的错误SSL链接仍可继续,只是会给出错误警告 Record 协议:包括对消息的分段、压缩、消息认证和完整性保护、加密等 HTTPS 协议:就是“HTTP 协议”和“SSL/TLS 协议”的组合。 HTTP over SSL”或“HTTP over TLS”,对http协议的文本数据进行加密处理后,成为二进制形式传输

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