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I'm an engineer with experience in applied cryptography, in particular in Smart Card systems.


Jan
21
answered A specific way for deniable encryption
Jan
21
revised A specific way for deniable encryption
Add link to the proposed solution
Jan
21
comment ASCII to same-length ASCII encryption?
@PetrB; from two examples, we can break the Vernam cipher. No wait, you told us that you are using is, so one example is enough.
Jan
20
comment Rabin code same message sent with different $N$
@Alexander: RSA use odd public exponents, the minimum of which is 3. Rabin..
Jan
20
revised In what way is XXTEA really vulnerable?
Fix block size
Jan
20
comment Rabin code same message sent with different $N$
@Alexander: your enciphering method is to Rabin what naked (or textbook) RSA is to RSA. Some of the attacks that apply to naked RSA can be adapted to naked Rabin, including the one pointed by poncho. You may also want to read the introduction of section 4.2 of Twenty Years of Attacks on the RSA Cryptosystem and adapt from that.
Jan
20
revised Rabin code same message sent with different $N$
Fix obvious typo
Jan
20
revised Are there groups where the computational Diffie Hellman problem is easy but the discrete log problem is hard?
Beautify
Jan
20
comment Are there groups where the computational Diffie Hellman problem is easy but the discrete log problem is hard?
Welcome to CSE! Notice that formulas can be written in (La)Tex, e.g. $g^{ab}$ renders as $g^{ab}$.
Jan
20
comment ASCII to same-length ASCII encryption?
That's the job of format-preserving encryption. You won't get recommendation here for weak solutions, and seldom for ready-made tools. As an aside: is the : only in the source set a typo?
Jan
20
comment Which is better ECDHE with TLS 1.0
@CodesInChaos: All this, especially "RC4 has some weaknesses even against passive attacks", makes a lot of sense. Thanks!
Jan
20
revised RSA cipher wrong use
Expand
Jan
20
revised Java's SecureRandom & plaintext attack?
Beautification
Jan
20
revised In what way is XXTEA really vulnerable?
Polish
Jan
20
revised Java's SecureRandom & plaintext attack?
Final(?) polish
Jan
20
revised Java's SecureRandom & plaintext attack?
Use a different $\boxplus$
Jan
19
revised Java's SecureRandom & plaintext attack?
Fix odds of cycling
Jan
19
revised Java's SecureRandom & plaintext attack?
Fix cycle lengths avoided
Jan
19
revised Java's SecureRandom & plaintext attack?
Complete rework
Jan
19
revised Java's SecureRandom & plaintext attack?
Reverse engineer the intend. More details on the claim of badness of `SHA1PRNG` of the default Sun Provider