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Aug
25
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.
Aug
25
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.
Aug
25
comment Pseudo Random Function
Thanks otus, see you in the >10K group soon (don't forget to signal when you overtake me :) )
Aug
25
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.
Aug
25
revised Ensuring integrity and confidentiality together with symmetric encryption
added 130 characters in body
Aug
25
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.
Aug
25
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
revised Does it make sense to have a compression function that uses 64-bit of the message to create an output of 64-bit?
copying actual question to title
Aug
24
revised OTP same message encrypted twice (with different keys)
added same explanation of that of Ricky using the invalid constraint on the keys
Aug
24
revised OTP same message encrypted twice (with different keys)
added 104 characters in body
Aug
24
answered OTP same message encrypted twice (with different keys)
Aug
24
revised Is double encryption using AES using different key lengths (128 bit and then 256 bit) vulnerable?
edited tags
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
revised CKM_RSA_PKCS vs CKM_RSA_X_509 mechanisms in PKCS#11
rewrote final note
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
revised Triple-DES DUKPT CBC PIN variant vs Data variant
formatting and language fixes (e.g. one -> once)
Aug
23
reviewed Reviewed Digital signature algorithms within the European Union