This document specifies usage of AES-CTR with IKEv2, similar to usage of AES-CTR with ESP as specified in . The reader is referred to [ RFC3686 ] for the same descriptions and definitions. The authors thank Russ Housley for providing the document.

AES-CTR uses the only AES encrypt operation (for both encryption and decryption), making AES-CTR implementations smaller than implementations of many other AES modes. When used correctly, AES-CTR provides a high level of confidentiality.

The AES homepage, http://www.nist.gov/aes, contains a wealth of information on AES including the Federal Information Processing Standard that fully specifies the Advanced Encryption Standard. The following subsections contain descriptions of the relevant characteristics of the AES ciphers used in the symmetric encryption protocol described in ...

AES-CTR uses the AES block cipher to create a stream cipher. Data is encrypted and decrypted by XORing with the key stream produced by AES encrypting sequential IV block values, called "counter blocks", where: * The first block of the key stream is the AES encryption of the IV.

This document describes the usage of Advanced Encryption Standard Counter Mode (AES-CTR), with an explicit Initialization Vector, by the Internet Key Exchange version 2 (IKEv2) protocol, for encrypting the IKEv2 exchanges that follow the IKE_SA_INIT exchange.

AES-CTR uses the AES block cipher to create a stream cipher. Data is encrypted and decrypted by XORing with the key stream produced by AES encrypting sequential counter block values. AES-CTR is easy to implement, and AES-CTR can be pipelined and parallelized. AES-CTR also supports key stream precomputation.

2024年3月3日 · AES-CTR即AES算法的计算器模式（Counter (CTR)），这种计算器模式不常见，在CTR模式中， 有一个自增的算子(IV,后四个字节相当于计数器，每次计算递增)，这个算子用密钥加密之后的输出和明文异或的结果得到密文，相当于一次一密。

本文档描述了通过互联网密钥交换版本2（IKEv2）协议使用高级加密标准计数器模式（AES-CTR）和显式初始化向量，对IKEv2交换进行加密，该交换遵循IKE_SA_INIT交换。 This document is not an Internet Standards Track specification; it is published for informational purposes. 本文件不是互联网标准跟踪规范；它是为了提供信息而发布的。 This document is a product of the Internet Engineering Task Force (IETF).

The Counter (CTR) mode is a typical block cipher mode of operation using block cipher algorithm. In this version, we provide Advanced Encryption Standard (AES) processing ability, the cipherkey length for AES should be 128/192/256 bits.

The "aes256-ctr" method uses AES with 256-bit keys. The "3des-ctr" method uses three-key triple-DES (encrypt-decrypt- encrypt), where the first 8 bytes of the key are used for the first encryption, the next 8 bytes for the decryption, and the following 8 bytes for the final encryption.