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8h
comment RSA - PKCS#1 padding - overall correction of algorithm
@SEJPM Could you please convert the comments into an answer?
8h
comment CPA-security proof of “l-padded RSA” encryption scheme
I think you rather well answered your own question, @pa5h1nh0. However this may not be the place for followup questions. If you're stuck, try again, and if that doesn't work, ask a new question please.
9h
comment Size of encrypted AES CEK in CMS block
Could you show the entire output at the bottom of your question? Or otherwise by a comment containing a link to the structure as input in the online ASN.1 decoder? There should be some information structure containing the algorithm that was used.
9h
comment Why do we truncate the hash when using DSA?
Thanks for the update PicPuc. I should remember to use \bmod instead of \mod!
14h
comment Having plaintext and ciphertext, how can I learn more about key/encryption?
I've got the inkling of a feeling that wlraider requires a top modern encryption technique here. I don't think this was a request for a generic education on cryptography - and if it was, it would be off topic.
2d
comment Can RSA be securely used for “blind decryption”?
$\mathcal E(k)$ is RSA KEM if $\mathcal E$ = RSA, right? So the encryption/decryption should be no issue...
2d
comment Why is RSA encryption significantly faster than decryption?
Could you indicate what your answer adds to D.W.'s explanation? Note that (small) changes to the explanation can be performed using edits of the existing answer. Of course, you should be relatively sure of your change to edit questions from one of the top 8 players.
2d
comment Why is RSA encryption significantly faster than decryption?
The fact that Fermat 4 (65537) has only 2 bits set to 1 could be included in the reason why RSA public key calculations are relatively fast.
2d
comment Why is RSA encryption significantly faster than decryption?
$d$ is a number that is not necessarily 2048 bit of course. It may well start with a couple of zeros.
2d
comment Email: Degrees of Security
No, end to end encryption is not point to point encryption. TLS is transport security, email is application level security. You may use TLS in the connection to e.g. the mail server, but email security is at a higher layer.
2d
comment Pseudo Random Function
Thanks otus, see you in the >10K group soon (don't forget to signal when you overtake me :) )
2d
comment Ensuring integrity and confidentiality together with symmetric encryption
Confidentiality of CBC is not automatically guaranteed. Often padding oracles apply, and those do break CBC confidentiality.
2d
comment What is the difference between a random oracle and a probabilistic algorithm?
Without more context this looks like a request to show the difference between two random terms so I've cast the final vote to close this question.
2d
comment Envelope Encryption with asymmetric keys vs KMS
Without any specific cryptographic algorithm this may be better suited to IT security I think. This is more about which policy fits the best to the problem field than anything else.... I can only think of things like: you don't need a KMS, you don't need a trusted third party or active service (etc. etc.).
Aug
24
comment Diffie-Hellman in the wild
If you are satisfied with the answer then it is very much appreciated if you accept it. If you're still missing information then please indicate this in a comment so we know what's missing.
Aug
24
comment Does it make sense to have a compression function that uses 64-bit of the message to create an output of 64-bit?
I've copied the actual question in the updated text and used it as title. That seems to fix the issue that @D.W. had with this question. z7ea8gozm5, I see you haven't accepted any of the answers...
Aug
24
comment how to do AES decryption knowing the key (matasano)
The matasano challenges have been created specifically to see if you can do them yourself. Asking us to do the main part and then do the rest yourself is not in the spirit of the thing. Besides that, this isn't a concise question beyond "solve this for me".
Aug
24
comment Recommended password complexity for SSH key encryption using AES-256-CBC
Yeah, removed comment and voted up. You may however indicate that it is optional to use PBKDF's if the passphrase is sufficiently strong and unique. Or vote this comment up of course :)
Aug
23
comment Triple-DES DUKPT CBC PIN variant vs Data variant
Hi Devesh, welcome and of course thanks for the answer. Please reread your question and separate the different sections of the answer using double enter. Could you quickly review the changes I made?
Aug
23
comment Why must we generate the signature before any compression being done at PGP?
Glad I did, feel free to accept the answer if your problem is solved.