Block Ciphers: Simple attack on ECB mode

This is nothing new, but I just wanted to document it on my blog. Block ciphers encrypt data in blocks of bits. These blocks are generally 64 or 128 bits long. In the ECB (or Electronic Code Book) mode, each block is encrypted independently of the other blocks. As a result if two blocks are…

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ClubHACK 2007: I will be presenting some “Subtle Security Flaws”

In its own words, “ClubHACK is one of its kind hacker’s convention in India which serves as a meeting place for hackers, security professionals, law enforcement agencies and all other security enthusiasts.” At ClubHACK, I will talk about some interesting and subtle security flaws found while assessing business applications, which principles were not followed that…

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The Unbreakable Cipher

The concept of perfect secrecy is that given the cipher text, and any resources and amount of time, the adversary has no way of getting to the plain text. Having the cipher text makes no difference and provides absolutely no additional information. The adversary can try a brute force approach, by trying each and every…

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