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Results tagged with cryptography
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user 6939
Cryptography is the practice and study of logical means used to achieve information confidentiality, integrity and authenticity. It covers, among other things, encryption (making some data unreadable except for those who know a given secret element, called a key), data hashing (in particular for password storage) and digital signatures (provable integrity and authenticity with non-repudiation).
1
vote
Can encryption twice with two keys in different sequences lead to the same result?
RSA (unpadded) follows this requirement, if you use two different key pairs but the same modulus: (Update: no it doesn't, as Thomas Pornin pointed out in the comments)
(t^k1)^k2 = t^(k1*k2) = (t^k2)^ …
- 2,935
4
votes
Storing passwords in reversible form - a genuine use-case
While I disagree with this practice, if I had to keep very sensitive info in my server here's what I'd do:
Create a small daemon in the same server, and request that a human operator inputs a passwo …
- 2,935
1
vote
Recommended authenticated stream cipher for minimum overhead?
Assuming your protocol is stateful (i.e. you only need to send the parameters - such as the nonce/IV - once), then the overhead of using an AE mode should be very small. CCM for instance has a fixed o …
- 2,935
4
votes
Use of rainbow tables with the NY Times hack?
This is mostly speculation, but I see a number of plausible scenarios:
The article is correct, and NY Times did not salt their passwords;
They salted them, but used a hashing algorithm not slow enou …
- 2,935