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| bio | website | |
|---|---|---|
| location | Netherlands | |
| age | 39 | |
| visits | member for | 1 year, 5 months |
| seen | 16 hours ago | |
| stats | profile views | 15 |
Java and security expert with over 10 years of experience with the language and with the practical application of cryptographic protocols - including the design of protocols within international standardization bodies. Creator of a heavily used common criteria certified product. Over 30 years of experience with computers. Likes kids, cats, reading, movies and several sports.
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Apr 17 |
comment |
decryption many time pad But I managed to misspell one word on the first attempt :) |
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Apr 16 |
comment |
Ciphertext-only attack on Simplified DES You can probably brute force both, but only if you have enough information regarding the plain text. If the plain text is just random bits then you have no way of determining if your brute force attack succeeded... |
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Apr 2 |
revised |
What are advantages of using a HMAC over RSA with SHA-1 hashes? small but important spelling mistake must -> much |
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Apr 2 |
suggested | suggested edit on What are advantages of using a HMAC over RSA with SHA-1 hashes? |
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Apr 2 |
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What are advantages of using a HMAC over RSA with SHA-1 hashes? @OwenOrwell Sorry for the misunderstanding, that was about a typo in the answer, I'll edit it. |
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Mar 22 |
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Partial decryption of large file in AES-GCM (or other modes)? Anything missing from my answer, sid? |
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Mar 20 |
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Encrypting and Decrypting a 19-digits long BigInteger Please also see the cross post on stackoverflow |
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Mar 20 |
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Encrypting and Decrypting a 19-digits long BigInteger Same as my answer on stackoverflow really, with some added info. |
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Mar 17 |
revised |
Is this encryption algorithm build from MD5 secure? Made explicit that the given calculations answered the original question, not the updated one |
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Mar 17 |
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Key collision in scrypt and hkdf @PaŭloEbermann besides that, if you ever are asked to deliver a product to an organization that takes security seriously, using MD5 or even SHA-1 is the equivalent to taking a red flag to the middle of a battle field (I've got the scars to prove it :) ). |
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Mar 17 |
suggested | suggested edit on Is this encryption algorithm build from MD5 secure? |
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Mar 17 |
comment |
What are the constraints for an IV using AES in CBC mode? The "IV" for GCM is actually called a nonce, and as the name suggests, it does not have to be indistinguishable from random. On the other hand, if the nonce is not unique then the consequences will be that all confidentiality of the plain text is lost. You may read the NIST requirements for the nonce in the CTR mode specifications. |
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Mar 17 |
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Low Public Exponent Attack for RSA Glad you found the right site :) |
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Mar 17 |
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Is AES-256 a post-quantum secure cipher or not? @CodesInChaos could you post your first comment as an answer? |
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Mar 13 |
answered | Partial decryption of large file in AES-GCM (or other modes)? |
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Mar 12 |
awarded | Popular Question |
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Mar 11 |
comment |
Method and explanation for calculating difference in speed between DES and RSA The speed difference should be very noticable on a CPU platform. So your professor is likely not interested in precise numbers. To compare speed: openssl command line has performance related functionality. For fun, also generate a high security RSA key pair (16 Kib) and see how long that takes. |
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Mar 3 |
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What information to include is the 'info' input for HKDF? The IKM certainly is most important regarding the entropy within the derived key, but the info part should certainly be used to derive the different keys. As always, there's the issue with terms and definitions, I'll check out the HKDF (again, I've implemented the function) to see if I can make changes to make the answer use identical terms & definitions. |
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Mar 3 |
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Can I combine two PRNGs to make use of more seed data? There are by definition only 2^160 possible streams because the state is 160 bits... And 160 bits is a lot. |
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Mar 3 |
revised |
Can I combine two PRNGs to make use of more seed data? added 161 characters in body |
