Imagine you want to send some message to your friend and you don't want others to peek on your message. So you lock your message in a box using a key and send the box to your friend and your friend also have a key to unlock the box so he can easily unlock the box and read the message. In general this is the technique used by any cryptographic algorithm. Locking up the message in the box is called Encryption and Unlocking is called Decryption. Before message being sent to the receiver the data is encrypted using an encryption algorithm and a secret key. On the receiver side the encrypted data is decrypted using the reverse encryption algorithm. Classical cryptographic algorithms mostly rely on mathematical approaches to secure key transmission. The security they offer is based upon unproven assumptions and depends on the technology available to an eavesdropper. But rapidly growing parallel technology and Quantum technology may be a threat to these classical cryptography in near future. One of the solutions of these threats is Quantum Cryptography. Now what is Quantum Cryptography? Quantum cryptography is a complex topic because it brings in to play something most people find hard to understand -- quantum mechanics. Now lets focus on some basic quantum physics that we must know to understand this article.

## Monday, 10 February 2014

## Sunday, 9 February 2014

### Searching an element in a row and column wise sorted matrix

There may be lots of ways to solve this problem. I will discuss three ways to solve this problem using a

(i)linear search,

(ii)binary search,

(iii) binary search graph [ I know its bit confusing. Don't go on the name ]

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