![]() ![]() However, this has nothing to do with their implementation of AES-256 as long as it's not broken, it'll still produce the same ciphertext. Because they're in different formats, the files produced by telling 7zip to encrypt a zipfile versus telling OpenPGP to encrypt a message will likely be different.The derived key matches with the one in 7zip. ![]() Not the 7z format) I have the 39 byte binary payload. I want to use OpenSSL to decrypt the payload. Bad usages also exist for example, the AES mode can be any number of things - ECB, CBC, GCM - and picking the wrong one could break your security. 1 My goal is to decrypt an AES-256 encrypted file compatible with Winzip, produced by 7zip. Bad implementations of AES do exist, and can be exploited, depending on context.It takes as input a secret key and a message, and it encrypts that key with that message.ĪES-256 is one of the many encryption algorithms that the OpenPGP standard supports.Įncrypting something with AES-256 and the same key with OpenPGP is going to lead to the same ciphertext (encrypted text) as using any other software. The exact requirements for the IV depend on the chosen chaining mode, but a random 128 bit value is usually fine. If you use a key multiple times you should use a different IV each time, so a (key, IV) pair isnt reused. It can use encryption (and that's its whole raison d'être, so it normally does) but the algorithm it uses is variable.ĪES-256, on the other hand, is a specific algorithm. 2 Answers Sorted by: 15 If you use each key only a single time, not using an IV is fine. zip software and not by Windows built-in compression. OpenPGP is, notably, not an encryption algorithm. Zip files created with AES-256 can be opened with 7-Zip and WinZip, but not necessarily with other. Some other metadata which isn't relevant here.The ZIP file format permits a number of compression, though DEFLATE is the most common. A ZIP file may contain one or more files or directories that may have been compressed. Any required parameters for that algorithm (e.g. From Wikipedia, the free encyclopedia archive file format lossless data compression.That message format is fairly complex, but in short, it contains: OpenPGP is a standard defining a message format. ![]()
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