2012年4月1日 · An interesting thing about some modern standardized ciphers, like AES, is that the government is "eating its own dogfood" by using them internally. (AES 192 and 256 are approved for top-secret data.) Back in the day (up through the 90s), U.S. government internal encryption standards was not closely aligned with public sector cryptography, and ...

Therefore AES-256 is the golden standard in the industry with only 40% performance penalty when compared to AES-128. Always use AES-256 with a good mode of operation for your target security. That explains why we are using 256-bit keys to encrypt top secrets. But latest practical attack on AES shows brute-forcing AES-256 take $2^{100}$ operations.

2017年11月17日 · @script8man - there is a much higher chance of an implementation flaw in a common AES toolset than in the underlying algorithm itself. The maths behind AES is viewed to be unbreakable with modern technology. Of course if parameters are chosen badly by buggy software anything encrypted with that software may be breakable. –

2022年7月21日 · AES-256 GCM is compared to AES-256 CBC + some authenticator (e.g. CBC-MAC with a derived key) Authentication tag : it's part of the ciphertext, in clear. It usually is at the end, and must be for a so-called "online algorithm", since the tag becomes known to the sender only after the whole plaintext was processed.

Before answering your questions: GCM is an authenticated encryption mode of operation, it is composed of two separate functions: one for encryption (AES-CTR) and one for authentication (GMAC). It receives as input: a Key; a unique IV; Data to be processed only with authentication (associated data) Data to be processed by encryption and ...

2017年10月29日 · I heard that the fastest method to crack an AES-128 encryption, or and AES-256 encryption is by brute force, which can take billions of years. But I can't help thinking there's got to be a faster way. Because the AES encryption scrambles the data contained in a zip file, the password could be found by unscrambling that data correctly.

2022年11月6日 · Keys for AES-256 can easily be created manually. Any 256 bit long bit sequence can be used as an AES-256 key. You don't have to use any generators and create a valid key manually. Human generated keys have usually less entropy than the generated by some quality random generator that is based on quality entropy source, that's why it is ...

I used AES256-CBC to SSH to a remote server. Recently, it stopped working with the following message: no matching cipher found: client aes256-cbc server aes128-ctr,aes256-ctr,arcfour256,arcfour,...

2018年4月22日 · If all of your systems support AES-256-GCM, and have the resources to run it, and have a higher security need, then use AES-256-GCM. For example, I have systems that do not support anything newer than SSL3, RC4 and MD5, with 1024-bit certs.

2017年8月12日 · Knowing that AES is a sysmmetrical block-cipher algorithm with a 128-bit block size, I think the answer for IV is still 16 bytes or 128 bits for AES 128, 192 and 256. Reading this stackoverflow Q&A it seems as if the size of the IV is the size of the block which is always 128 bit (= 16 bytes) in AES, even if the keysize is larger than the block ...